Cardiovascular system Structure
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Name the structure of capillaries | Walls one cell thick
narrow
large in number
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| Name the structure of a vein | Walls contain thin layer of muscle
Return blood to heart
Pocket valves
Positioned between skeletal muscle
Positioned inside thoracic cavity
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| Name the structures of an artery | Thick walls (middle layer of smooth muscle) to with stand high blood pressure. Takes blood away from the heart
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| What does vasoconstriction mean? | Reducing flow of blood into capillaries by action of sympathetic nerves
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| What does vasodilatation mean? | Increasing flow of blood into capillaries
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| Why does the body redistribute blood? . | To ensure that oxygen and nutrients are directed to the tissues needed it and to control temperature
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| Why does more blood go to the heart, skin, and working muscles during exercise? | Heart is a muscles and requires nutrients, working muscles require nutrients, skin requires energy to cool body and also to radiate heat away
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| What are pre-capillary sphincters? | Rings of muscle at the entrance to a capillary bed, which can vasodilate or constrict the arteriole serving that capillary bed
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| Blood in the vena cave vein is low in which substance? | Oxygen
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| What role do the semi lunar valves have in the heart? | They prevent blood from flowing back into the ventricles
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| Which side of the heart pumps blood to the lungs? | Right side
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| What are the heart chambers called that fill with blood from the vena cava | atrium
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| Why does the left side of the heart have a thicker wall? | Because it pumps blood to the body, needs more force
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| Why are there two sides to the heart | It enables two pumps to function separately (to the lungs to collect oxygen and then to the body to deliver the oxygen and take waste products away)
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| Name the two bottom chambers of the heart | Ventricles
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| Where are the semi lunar valves? | The valves that prevent back flow into the heart where the blood leaves to heart into the pulmonary artery and aorta
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| Name the two valves that separate the atrium from the ventricles | Bicuspid and tricuspid or atrioventricular valves
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Created by:
Tina Dean
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