Question 1

What happens during ventricular systole in a mammalian heart?

  A  

aortic pressure increases

  B  

atrioventricular valves open

  C  

semilunar valves close

  D  

ventricular pressure decreases

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Question 2

What happens during ventricular diastole?

  A  

all semilunar valves open

  B  

the atrioventricular valves open

  C  

the pressure in the atria rises above the pressure in the ventricles

  D  

the pressure in the left atrium rises more than the pressure in the right atrium

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Question 3

Which features allow an artery to resist changes in the pressure of blood flowing through it?

1 - smooth endothelium

2 - thick elastic layer in the artery wall

3 - thick layer of muscle in the artery wall

  A  

1, 2, and 3

  B  

1 and 2 only

  C  

1 and 3 only

  D  

2 and 3 only

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Question 4

Which statements are correct?

1 - tissue fluid has less protein and no red blood cells compared to plasma

2 - lymph may contain lipids, carbon dioxide and phagocytes

3 - tissue fluid contains glucose, amino acids, urea and carbon dioxide

  A  

1 and 2

  B  

2 and 3

  C  

1 and 3

  D  

1, 2, and 3

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Question 5

Which statement about the blood flow in the cardiac cycle is correct?

  A  

blood flows into the aorta through the semilunar valve due to contraction of the right ventricle

  B  

blood flows into the left atrium through the pulmonary artery when the wall of the left atrium relaxes

  C  

blood flows into the right atrium through the vena cava when the wall of the right atrium relaxes

  D  

blood flows into the right ventricle through the semilunar valve due to contraction of the right atrium

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Question 6

Why is the mammalian circulatory system described as a double circulation?

  A  

blood flows twice through the heart in one complete cardiac cycle


  B  

blood flows twice through the heart in one complete circuit of the body

  C  

blood remains within arteries, capillaries and veins

  D  

blood transports both oxygen and carbon dioxide

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Question 7

Which statements about arteries are correct?

1 - artery walls can resist high pressure

2 - arteries pump blood out of the heart

3 - blood in arteries has the same flow rate as in veins

4 - the pulse in arteries is the result of a surge in blood that causes expansion of the artery wall

5 - there are semilunar valves at the junction of arteries with the heart

  A  

1, 4, and 5

  B  

1, 2, 3, and 4

  C  

1 and 2 only

  D  

2 and 3 only

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Question 8

Which statement correctly compares blood plasma and tissue fluid in a healthy person?

  A  

blood plasma contains more protein than tissue fluid

  B  

both blood plasma and tissue fluid contain red blood cells

  C  

tissue fluid contains white blood cells whereas blood plasma does not

  D  

tissue fluid is formed from blood plasma and is not returned to blood plasma

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Question 9

What is the primary role of capillaries in the cardiovascular system?

  A  

to transport blood under high pressure

  B  

to return blood to the heart

  C  

to exchange metabolic substances such as oxygen and carbon dioxide

  D  

to regulate body temperature

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Question 10

Which vessels supply the heart muscle with oxygenated blood?

  A  

pulmonary veins

  B  

coronary arteries

  C  

pulmonary arteries

  D  

aorta

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Question 11

What is the function of the left atrioventricular (bicuspid) valve in the heart?

  A  

it allows deoxygenated blood to flow into the right atrium

  B  

it prevents backflow of blood into the left atrium during ventricular diastole

  C  

it regulates the flow of blood from the right ventricle to the pulmonary artery

  D  

it prevents backflow of blood into the left atrium during ventricular systole

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