circulatory system revision Flashcards

1
Q

what is systole

A

the contraction phase of the atria and ventricles.

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2
Q

what is systole measured in

A

mmHg and give the upper reading of BP

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3
Q

Aorta is

A

a major artery that carries oxygenated blood out of the left ventricle and through the systemic circulatory system

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4
Q

Capillaries

A

microscopically thin blood vessels which are fed by arterioles and are semi permeable allowing O2 and CO2 to pass through their walls

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5
Q

valves

A

found in the heart between the top and bottom chambers . it prevents regurgitation of blood.

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6
Q

skeletal pump

A

during exercise the muscles surrounding the veins expand and contract, pressing on the veins and causing a pumping effect to maintain venous return

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7
Q

pulmonary

A

its an artery that takes deoxygenated blood from the right ventricle to the lungs to pick up O2 and get rid of CO2

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8
Q

cardiac

A

is a type of muscle that forms the heart. it receives its own nourishment via the coronary arteries

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9
Q

cardiac output

A

amount of blood poured out by the left ventricle each minute . at rest usually 5 litres/minute.

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10
Q

veins

A

blood has to travel against gravity and back up to the right atrium. thinner walls and are less elastic.

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11
Q

anaemia

A

a condition where a person has a shortage of red blood cells and constantly feels tired weal and reathless

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12
Q

red blood cells

A

bi concave disc shape, contain iron have a life cycle of about 120 days and produce in bone marrow which contain haemoglobin

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13
Q

white blood cell

A

produced in bone marrow lymph tissue and spleen they have no special shape

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14
Q

platelets

A

responsible for blood clotting

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15
Q

diastolic pressure

A

measure of the blood pressure against the artery walls during the relaxation phase of the hearts pumping action

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16
Q

systolic pressure

A

measure of the pressure that the blood exerts against the artery walls during the contractile stage of the hearts pumping action