the digestive system chapter 30.3

Question 1 of 66

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When you are hungry your whole body needs food, but the only system in the body that food actually enters is called the:

Select one or more of the following:

  • excretory system

  • digestive system

  • neurological system

Question 2 of 66

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there are challenges that every animal faces when needing food:

Select one or more of the following:

  • the need to obtain the food

  • the need to convert the food into useful molecules

  • both of the above

  • neither of the above

Question 3 of 66

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this system converts food into small molecules that can be used by the cells of the body

Select one or more of the following:

  • digestive system

  • excretory system

Question 4 of 66

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food is processed in the digestive system in four phases:

Select one or more of the following:

  • ingestion, digestion, absorption, elimination

  • digestion, absorption, production, elimination

Question 5 of 66

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ingestion is the first step and involves putting food into your mouth, the opening to the digestive tract

Select one of the following:

  • True
  • False

Question 6 of 66

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as food passes through the digestive system it is broken down in two ways by mechanical and chemical digestion

Select one of the following:

  • True
  • False

Question 7 of 66

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this type of digestion physically breaks down larger pieces of food into smaller pieces so that the smaller pieces can be swallowed and accessed by digestive enzymes

Select one or more of the following:

  • mechanical digestion

  • chemical digestion

Question 8 of 66

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In this type of digestion, enzymes break down food into small molecules that the body can use

Select one or more of the following:

  • mechanical digestion

  • chemical digestion

Question 9 of 66

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once food has been broken into small molecules it can be absorbed by cells in the small intestines and this process is called

Select one or more of the following:

  • ingestion

  • digestion

  • absorption

  • elimination

Question 10 of 66

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From the small intestine the molecules enter the circulatory system which transports them throughout the body

Select one of the following:

  • True
  • False

Question 11 of 66

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the digestive system cannot digest and absorb all the substances in food that enter the body and some materials travel though the large intestine and are eliminated from the body

Select one of the following:

  • True
  • False

Question 12 of 66

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the digestive system cannot digest and absorb all the substances in food that enter the body and some materials travel though the large intestine and are eliminated from the body

Select one of the following:

  • True
  • False

Question 13 of 66

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the digestive system cannot digest and absorb all the substances in food that enter the body and some materials travel though the large intestine and are eliminated from the body

Select one of the following:

  • True
  • False

Question 14 of 66

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a one way tube that passes through the body that is vital to the human digestive system is called the

Select one or more of the following:

  • aluminium canal

  • aluminory canal

  • alimentary canal

Question 15 of 66

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During digestion, food travels through the mouth, espophagus, stomach and small intestine

Select one of the following:

  • True
  • False

Question 16 of 66

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mechanical and chemical digestion are the two processes by which food is reduced to molecules that can be absorbed

Select one of the following:

  • True
  • False

Question 17 of 66

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both mechanical and chemical digestion start in the

Select one or more of the following:

  • mouth

  • espohagus

Question 18 of 66

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the work of the digestive system begins in the

Select one or more of the following:

  • esophagus

  • mouth

Question 19 of 66

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the process of mechanical digestion begins with

Select one or more of the following:

  • chewing

  • swallowing

Question 20 of 66

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chemical digestion begins as digestive enzymes in saliva start the breakdown of complex carbohydrates into smaller molecules

Select one of the following:

  • True
  • False

Question 21 of 66

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the teeth are anchored in the bones of the jaw and their surfaces are protected by a coating of mineralized enamel

Select one of the following:

  • True
  • False

Question 22 of 66

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the teeth do much of the mechanical work of digestion as

Select one or more of the following:

  • the incisors, cuspids and bicuspids cut into and tear at food

  • the molars grind and cursh food into a fine paste that can be swallowed

  • neither of the above

  • both of the above

Question 23 of 66

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this moves food around so that it comes into contact with your teeth

Select one or more of the following:

  • your lips

  • your teeth

Question 24 of 66

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as the teeth cut and grind the food, these glands secrete saliva which helps to moisten the food and make it easier to chew

Select one or more of the following:

  • salivary glands

  • thyroid glands

Question 25 of 66

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The release of saliva is under the control of the nervous system and can be triggered by the scent of food

Select one of the following:

  • True
  • False

Question 26 of 66

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saliva not only eases the passage of food through the digestive system but also begins the process of chemical digestion

Select one of the following:

  • True
  • False

Question 27 of 66

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saliva contains an enzyme called amylase that begins to break the chemical bonds in starches, forming sugars.

Select one of the following:

  • True
  • False

Question 28 of 66

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saliva also contains an enzyme that fights infection by digesting the cell walls of many bacteria that may enter the mouth with food- this enzyme is called

Select one or more of the following:

  • amylase

  • lysozyme

Question 29 of 66

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once food is chewed the combined actions of the tongue and throat muscles push the clump of food down the throat

Select one of the following:

  • True
  • False

Question 30 of 66

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the clump of food that forms once food is chewed is called

Select one or more of the following:

  • bolus

  • globule

Question 31 of 66

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the clump of food that forms once food is chewed is called

Select one or more of the following:

  • bolus

  • globule

Question 32 of 66

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when you first swallow the the bolus enters the area at the back of the throat called the

Select one or more of the following:

  • esophagus

  • pharynx

Question 33 of 66

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a flap of tissue closes the opening of the trachea preventing food from moving into the air passageways to the lungs as it passes through the pharynx and into the esophagus and this flap of tissue is called

Select one or more of the following:

  • glottis

  • epiglottis

Question 34 of 66

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from the throat the bolus passes through a tube into the stomach, and this tube is called the

Select one or more of the following:

  • pharynx

  • esophagus

Question 35 of 66

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contractions of smooth muscles known as peristalsis provide the force that moves food through the espophagus toward the stomach

Select one of the following:

  • True
  • False

Question 36 of 66

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after food passes into the stomach a thick ring of muscle closes the esophagus. this ring is called the

Select one or more of the following:

  • epiglottis

  • cardiac sphincter

Question 37 of 66

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the cardiac sphincter prevents the contents of the stomach from flowing back

Select one of the following:

  • True
  • False

Question 38 of 66

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overeating or drinking excess caffeine can cause a backflow of stomach acid into the esophagus called heartburn

Select one of the following:

  • True
  • False

Question 39 of 66

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the stomach is a large muscular sac that contains the chemical and mechanical digestion of food

Select one of the following:

  • True
  • False

Question 40 of 66

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the lining of the stomach contains millions of microscopic gastric glands that release many substances into the stomach, some of the gland produce hydrochloric acid and others release an enzyme called pepsin

Select one of the following:

  • True
  • False

Question 41 of 66

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pepsin is an enzyme that

Select one or more of the following:

  • is activated in and function best in acidic conditions

  • breaks down proteins into smaller polypeptide fragments

  • both of the above

  • neither of the above

Question 42 of 66

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another stomach gland produces mucus which is a fluid that lubricates and protects the stomach wall

Select one of the following:

  • True
  • False

Question 43 of 66

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if the protective layer fails acids may erode the stomach lining causing a sore called a peptic ulcer

Select one of the following:

  • True
  • False

Question 44 of 66

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most peptic ulcers are the result of infection with the bacterium Helibacter Pylori rather than from too much acid, and it can now be cured with antibiotics

Select one of the following:

  • True
  • False

Question 45 of 66

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alternating contractions of the stomach's three smooth muscle layers thoroughly churn and mix the swallowed food

Select one of the following:

  • True
  • False

Question 46 of 66

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the churning in the stomach causes

Select one or more of the following:

  • further breakdown of the chunks of swallowed food

  • allow enzymes greater access to the food

  • both of the above

  • neither of the above

Question 47 of 66

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a mixture with an oatmeal like consistency is produced in the stomach called chyme

Select one of the following:

  • True
  • False

Question 48 of 66

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after an hour or two the pyloric valve located between the stomach and the small intestine opens and chime begins to spurt into the small intestine

Select one of the following:

  • True
  • False

Question 49 of 66

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as chyme is pushed through the pyloric valve it enters the duodenum

Select one of the following:

  • True
  • False

Question 50 of 66

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the duodenum is

Select one or more of the following:

  • the first part of the small intestine

  • where almost all of the digestive enzymes enter the intestine

  • both of the above

Question 51 of 66

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most of the chemical digestion and absorption of the food you eat occurs in the small intestine

Select one of the following:

  • True
  • False

Question 52 of 66

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as chyme enters the duodenum from the stomach it mixes with the enzymes and digestive fluids from the pancreas, liver, and even the lining of the duodenum itself

Select one of the following:

  • True
  • False

Question 53 of 66

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the following is true about the pancreas

Select one or more of the following:

  • it is located just behind the stomach

  • produces hormones that regulate blood sugar levels

  • it produces enzymes that break down carbohydrates, proteins, lipids and nucleic acids

  • produces sodium bicarbonate, a base that quickly neutralizes stomach acid as chyme enters the duodenum

  • all of the above

Question 54 of 66

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the following is true about the liver

Select one or more of the following:

  • it assists the pancreas in fat digestion

  • it produces bile, a fluid loaded with lipids and salts

  • both of the above

  • neither of the above

Question 55 of 66

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bile is stored in a small, pouchlike organ called the gallbladder

Select one of the following:

  • True
  • False

Question 56 of 66

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the following is true about fat

Select one or more of the following:

  • when fat is presented in the duodenum the gallbladder releases bile through a duct into the small intestine

  • fats tend to glob together which makes fat digestion by enzymes such as lipase difficult

  • bile breaks up the globs of fat into smaller droplets that disperse in the watery environment of the small intestine making it possible for enzymes to reach the smaller fat droplets and break them down

  • all of the above

Question 57 of 66

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most nutrients from food are absorbed through the walls of the small intestine

Select one of the following:

  • True
  • False

Question 58 of 66

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the large intestine absorbs water and several vitamins and prepares waste for elimination from the body

Select one of the following:

  • True
  • False

Question 59 of 66

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after leaving the duodenum chyme moves along the rest of the small intestine and by now most of the chemical digestion has been completed and the chyme is now a rich mixture of small and medium sized nutrient molecules that are ready to be absorbed

Select one of the following:

  • True
  • False

Question 60 of 66

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the small intestine is especially adapted for absorption of nutrients in the following ways

Select one or more of the following:

  • its folded surface and fingerlike projections provide an enormous surface for absorption of nutrient molecules

  • the fingerlike projections called villi are covered with tiny projections known as microvilli

  • as slow, wavelike contractions move the chyme along the surface, microvilli absorb nutrients

  • nutrient molecules are rapidly absorbed into the cells lining the small intestine

  • most of the products of carbohydrate and protein digestion are absorbed into the capillaries in the villi

  • most fats and fatty acids are absorbed by lymph vessels

  • all of the above

Question 61 of 66

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by the time chyme is ready to leave the small intestine it is basically nutrient free as complex organic molecules have been digested and absorbed, leaving only water, cellulose, and other undigestable substances behind

Select one of the following:

  • True
  • False

Question 62 of 66

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as material leaves the small intestine and enters the large intestine, it passes by a small saclike organ called the appendix

Select one of the following:

  • True
  • False

Question 63 of 66

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when chyme leaves the small intestine it enters the large intestine or colon

Select one of the following:

  • True
  • False

Question 64 of 66

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the following is true about the large intestine

Select one or more of the following:

  • the large intestine is actually much shorter than the small intestine

  • the large intestine gets its name due to its diameter which is much greater than the diameter of the small intestine

  • the primary function of the large intestine is to remove water from the undigested material that is left

  • water is absorbed quickly across the wall of the large intestine leaving behind the undigested material

  • rich colonies of bacteria present in the large intestine produce compounds that the body is able to absorb and use including Vitamin K

  • all of the above

Question 65 of 66

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the concentrated waste material- the feces- that remains after most of the water has been removed passes into the rectum and is eliminated from the body through the anus

Select one of the following:

  • True
  • False

Question 66 of 66

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if not enough waster is absorbed a condition known as diarrhea occurs and if too much water is absorbed from the undigested materials a condition known as constipation occurs

Select one of the following:

  • True
  • False
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the digestive system chapter 30.3

lindy
Quiz by , created over 2 years ago

Quiz on the digestive system chapter 30.3, created by lindy on 30/03/2014.

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