Cardiovascular system blood pressure and redistribution
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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| What is blood pressure? | The force exerted by the blood against the walls of the blood vessels
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| What is systolic pressure? | The peak pressure in the arteries which occurs when the heart is contracting and emptying blood into the arterial system.
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| What is diastolic blood pressure? | The lowest pressure in the arteries which occurs when the heart is relaxing and filling with blood
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| What happens to blood pressure as it travels through the circulatory system? | Reduces the further it is away from the heart. Due to increased cross sectional area, friction of blood against the vessel wall and the length of the blood vessel
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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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| Name the structures 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 capillaries | Walls one cell thick
narrow
large in number
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| What are the two circulatory systems? | Pulmonary blood from heart to lungs and back to heart / Systemic oxygenated blood carries away from heart to body tissues and back
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| What does vasoconstriction mean? | Reducing flow of blood into capillaries by action of sympathetic nerves
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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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| 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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| Why tells the body that blood needs to be redistributed? | During exercise CO2 is produced this increases the acidity of the blood, picked up by chemorecpetors, message sent to brain, sympathetic nerves vasodiate/vasoconstrict pre capillary sphincters
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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 blood flow remain constant to the brain? | The brain is constnstly working and requires nutrients and oxygen
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Created by:
Tina Dean
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