blood moving throughout body Flashcards

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1
Q

right atrium

A

receives blood from body and passes it to the right ventricle

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2
Q

right ventricle

A

pumps blood to lungs

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3
Q

left atrium

A

receives blood from the lungs and passes it to the left ventricle

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4
Q

left ventricle

A

pumps blood to the rest of body
- wall of LV is thicker than wall of RV, because it needs to me much stronger when pumping blood through vessels

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5
Q

atrioventricular valves purpose - 2 types, their location and # of cusps/flaps

A

when the ventricles contract, the blood catches behind the flaps and seals off the opening between the atrium and ventricles, stops so blood must then leave the heart through the arteries and not flow back into the atria
1. tricuspid valve is located between the RA and RV, it has 3 flaps/cusps
2. bicuspid valve is located between the LA and LV and has 2 flaps/cusps

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6
Q

semilunar valves - 2 types, their location and # of cusps/flaps

A

when arteries leave heart, second set of valves that stop blood from flowing back into ventricles
1. pulmonary valve is located between the RV and pulmonary after and has 3 cusps
2. aortic valve is located between the LV and the aorta and has 3 cusps

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7
Q

circulation definition

A

the same blood flowing continuously through the heart

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8
Q

arteries

A

carries blood AWAY from the heart
- contain smooth muscle and elastic fivers
- ventricles contact and push blood into arteries
- the walls of arteries stretch to accomodate the extra blood
- when ventricles relax, the elastic artery recoils, this elastic recoil helps maintain blood pressure and keep it moving
^ they can contact swell to reduce diameter (vasoconstriction to reduce BF to an organ) and stretch to increase diameter (vasodilation to increase BF to an organ)

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9
Q

capillaries

A

the link between the arteries and veins

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10
Q

veins

A

carry blood TOWARDS the heart
veins and venues do not have muscular walls and are not able to change diameter
- BP in veins is relatively low, because blood lost most of its pressure as it flows through the tiny capillaries
- much thinner.

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11
Q

cardiac cycle

A

heartbeat - sequence of events that occurs In ONE complete beat of the heart
systole: the pumping ogees when the heart muscle contracts
diastole: the filling phase when the heart muscles relax
for a short time, both atria and ventricles are in diastole
^ during this phase, the atria fill with blood and ventricles also receive blood as valves are open
atrial systole: contraction of atria that forces the remaining blood into the ventrictures
the atria then relax and refill while ventricles contract in:
ventricular systole: forces blood into arteries

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12
Q

cardiac output

A

cardiac output (mL/minute) = stroke volume (mL) x heart rate (beats per minute)

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