Test
The heart
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Preguntas del test (61)
1The circulatory system's job is to...
- ATransports oxygen through the body and removes waste from tissues.
- BTransports oxygen, nutrients and other substances throughout the body and removes wastes from tissues.
2The human body's major transportation system is a
- AClosed circulatory system
- BOpen circulatory system
3The human body's closed circulatory system is made up of...
- AThe heart and blood
- BThe heart, and blood vessels
- CThe heart, blood vessels and blood.
4Your heart is a.....
- AHollow organ about the size of a clenched fist.
- BA narrow organ about the size of a clenched fist.
5The heart is composed almost entirely of....
- ANerves
- BBlood
- CMuscle
6In the walls of the heart two thin layers of epithelial and connective tissue form a sandwich around a muscle layer called the .....
- AEndocardium
- BCardin
- CMyocardium
7Powerful contractions of what pump blood through the circulatory system
- AMyocardium
- BThe heart
8An adults heart contracts how many times per minute?
- A60
- B72
9A adult heart pumps about how many milliliter a of blood with each contraction
- A70
- B72
10The heart is divided into how many chambers?
- A2
- B4
- C6
11What separates the right side of the heart from the left side?
- AA wall called the septum
- BThe right atrium
12The septum prevents what?
- AOxygen poor and oxygen rich blood from mixing
- BOxygen flow in the atrium
13Each upper chamber is called the
- AAtrium
- BVentricle
14Each lower chamber is called the
- AAtrium
- BVentricle
15The atrium receives blood from the body.
- AVerdadero
- BFalso
16The ventricle pumps blood out of the heart.
- AVerdadero
- BFalso
17What brings oxygen poor blood from the upper body to the right atrium.
- AThe superior vena cava
- BThe tricuspid valve
18The right pulmonary veins bring oxygen rich blood from the right lung to the left atrium.
- AVerdadero
- BFalso
19The right atrium accepts oxygen poor blood from the body.
- AVerdadero
- BFalso
20The right ventricle pumps oxygen poor blood to the lungs.
- AVerdadero
- BFalso
21The inferior vena cava brings oxygen poor blood from the lower body to the right atrium.
- AVerdadero
- BFalso
22The pulmonary arteries carry oxygen poor blood to the lungs.
- AVerdadero
- BFalso
23The left atrium accepts oxygen rich blood from the lungs.
- AVerdadero
- BFalso
24the left pulmonary veins bring oxygen rich blood from the left lung to the left atrium.
- AVerdadero
- BFalso
25The valves in the heart are called the tricuspid, mitral, pulmonary and aortic valves.
- AVerdadero
- BFalso
26The aorta carries oxygen rich blood from the left ventricle to the body.
- AVerdadero
- BFalso
27The left ventricle pumps oxygen rich blood to the body.
- AVerdadero
- BFalso
28Blood from the body enters the heart through the right atrium
- AVerdadero
- BFalso
29Blood from the lungs enters the heart through the left atrium
- AVerdadero
- BFalso
30When the atria contract, blood flows into the ventricles.
- AVerdadero
- BFalso
31Valves are flaps of connective tissue and are located between the atria and the ventricles.
- AVerdadero
- BFalso
32When blood moves from the atria into the ventricles, what opens?
- AAtrium
- BValves
33When do the valves close and prevent blood from flowing back into the atria?
- AWhen the ventricles contract
- BWhen the atria open
34Valves are also located at the exit of each
- AAtrium
- BVentricle
35The system of valves keeps the blood moving through the heart in one direction, like traffic on a one way street.
- AVerdadero
- BFalso
36Heart muscle needs a constant supply of oxygen and nutrients.
- AVerdadero
- BFalso
37The coronary arteries which branch from the aorta and run through heart tissue supply blood to the heart muscle.
- AVerdadero
- BFalso
38Coronary arteries and the vessels that branch from them are relatively narrow and if they get blocked heart muscles can run out of oxygen and a heart attack can occur.
- AVerdadero
- BFalso
39Although the heart is one organ, it functions as two pumps-one to push the blood to the lungs and one to push blood to the rest of the body.
- AVerdadero
- BFalso
40The right side of the heart pumps oxygen-poor blood from the heart to the lungs where carbon divide diffuses from the blood and oxygen is absorbed by the blood. Oxygen rich blood then flows to the left side of the heart. This process is called
- ASystemic circulation
- BPulmonary circulation
41The left side of the heart pumps oxygen rich blood to the rest of the body. Cells absorb much of the oxygen and load the bold with carbon dioxide. The now oxygen poor blood returns to the right side of the heart for another trip to the lungs to pick up oxygen. The process by which the left side of the heart pumps oxygen rich blood to the rest of the body is called...
- APulmonary circulation
- BSystemic circulation
42To be an efficient pump, the heart must beat in an orderly and coordinated way.
- AVerdadero
- BFalso
43Two networks of muscle fibers coordinate the hearts pumping action. One is in the atria and one is in the ventricles.
- AVerdadero
- BFalso
44When a single muscle fiber in either network now muscle fibers is stimulated , the entire network contracts.
- AVerdadero
- BFalso
45The sinoatrial node (SA node) sets the pace for the heart and is called the pacemaker. When the SA nodes fire, electrical impulses spread through the entire network of muscle fibers in the atria and the atria contract. Each contraction begins with this small group of cardiac muscle fibers.
- AVerdadero
- BFalso
46The impulse from the SA node is picked up by another group of muscle fibers called the atrioventricular node (AV node). Here the impulse is delayed for a fraction of a second while the atria contract and pump blood into the ventricles. Then the AV node produces impulses that spread through the ventricles and cause the ventricles to contract, pumping blood out of the heart.
- AVerdadero
- BFalso
47The two step pattern of contraction first of the atria and then of the ventricles makes the heart an efficient pump.
- AVerdadero
- BFalso
48Your heart rate varies depending on your body's need to take in oxygen and release carbon dioxide.
- AVerdadero
- BFalso
49During vigorous exercise your heart rate could increase to about 200 beats per minute.
- AVerdadero
- BFalso
50As blood flows through the circulatory system it moves through three types of blood vessels-arteries, capillaries and veins.
- AVerdadero
- BFalso
51Arteries are large vessels that carry blood from the heart to the tissues of the body. They are the superhighways of the circulatory system.
- AVerdadero
- BFalso
52Except for the pulmonary artery all arteries carry oxygen rich blood. They have thick elastic walls that help them withstand the powerful pressure produced when the heart contracts and pumps blood through them.
- AVerdadero
- BFalso
53Capillaries are the smallest blood vessels and are like the side streets and alleys of the circulatory system. Most are so narrow that blood cells pass through them in single file. They have very thin walls which allow oxygen and nutrients to diffuse from blood into tissues and carbon dioxide and other waste products to move from tissues into blood.
- AVerdadero
- BFalso
54After blood passes through capillaries it returned to the heart though veins. Blood often must flow against gravity through the large veins in your arms and legs. Many veins are located near and between skeletal muscles. When you move the contracting skeletal muscles squeeze the veins pushing blood toward the heart. Many veins contain valves. The valve farthest from the heart closes to ensure blood continues to flow in one direction.
- AVerdadero
- BFalso
55Like any pump the heart produces pressure
- AVerdadero
- BFalso
56When the heart contracts it produces a wave of fluid pressure in the arteries and this pressure is known as blood pressure.
- AVerdadero
- BFalso
57A device called a sphygmomanometer measures blood pressure.
- AVerdadero
- BFalso
58Systolic pressure is a number that shows the force in the arteries when the ventricles contract.
- AVerdadero
- BFalso
59Diastolic pressure is the force in the arteries when the ventricles relax.
- AVerdadero
- BFalso
60 Typical blood pressure for a healthy adult or teen is 120/80
- AVerdadero
- BFalso
61The body regulates blood pressure in the following ways
- ASensory receptors in blood vessels detect blood pressure and send impulses to the brain stem. When blood pressure is high the autonomic nervous system releases neurotransmitter that relax the smooth muscles in the blood vessel walls. When blood pressure is low, neurotransmitters are released that cause the smooth muscles in vessel walls to contract.
- BThe kidneys regulate blood pressure by affecting the volume of blood. They remove water from the blood and eliminate it in urine when blood pressure is high or conserve more water when blood pressure is low.
- CNone of the above
- DAll of the above
Información
- Descripción
- Test sobre The heart, creado por lindy el 22/02/2015.
- Autor
- lindy
- Idioma
- English
- Visitas
- 19
- Valoración
- Aún sin valoraciones Valora este test