Fichas
DIGESTION
Fichas del conjunto (21)
- 1what is mechanical digetsionchewing/biting/cutting of food into smaller bits with a smaller surface area so that enzymes can act on the food quicker
- 2what is peristalsis?contraction of circular muscles behind the food narrows the gut, pushing the food along. when the circular muscles are contracted, the longitudinal ones relax and vice versa
- 3where does digestion begin? what happens there?in the mouth- saliva moistens the food and uses amylase to break down the starch
- 4what happens to the food in the stomach?it's held there- the walls of the stomach secrete hydrochloric acid which kills bacteria. pepsin begins to break down protein
- 5what happens when the food is released into the duodenum?pancreatic enzymes are released onto it
- 6what is the function of bile?made in the gaul bladder- turns lipid globs into an emulsion of tiny droplets to increase the surface area to be digested
- 7give an example of a carbohydrase, protease and lipaseamylase
pepsin
lipase - 8where is the food absorbed?the ileum
- 9how is the ileum adapted for absorption?the lining has a high surface area to efficiently absorb soluble products into the blood
vili- increase surface area
microvilli- increase surface area of the villi - 10what does the large intestine do to products which can't be absorbed?expells them as faeces
- 11name the 2 parts of the small intestneduodenum
ileum - 12how would you test for glucose?add a small spatula of glucose to a test tube, add a little bit of water and shake to dissolve glucose. Add benedicts solution and shake until the solution is blue. place the tube in a hot water bath an leave. If it turns brick red, there is starch present
- 13how to test for starch?add starch powder to a spotting tile
add iodine solution
blue black- starch present - 14why does a man need more energy than a woman?generally they have a larger weight
- 15why do pregnant women need more energy?because of the added weight
- 16why does a manual laborer need more energy?because of the increased physical activity
- 17how much energy raises the temp of 1 g of water by one degree?4.2 joules
- 18how many cm3 of water has a mass of 1g1
- 19how would you measure the energy content of a food sample?measure the sample's mass
measure the water's temp
burn the sample in a bunsen and hold it under the water to heat it.
measure the final temp of the water
(final temp-starting temp)x20x4.2 divided by the mass of the food - 20what is the digested molecule form of a)carbohydrates b)lipids c)proteinsa) glucose
b)fatty acids and glycerol
c)amino acids - 21where are digestive enzymes made?the glands and gut
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- Fichas sobre DIGESTION, creado por ashley.amber el 29/05/2013.
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- ashley.amber
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