Structure and Function of Circulatory System Flashcards

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1
Q

How many valves does the heart have?

A

two

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2
Q

Atrioventricular Valves (AV)

A

maintain unidirectional blood flow between atria and ventricles

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3
Q

Tricuspid and Bicuspid Valve locations

A

T - on the right of the atrioventricular

B - on the left of the atrioventricular

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4
Q

Semilunar Valves

A

Ensure one-way flow out of ventricles to arterial systems.

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5
Q

Pulmonary and Aortic Valves location

A

P - located at exit of right ventricle

A - located at exit of left ventricle

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6
Q

_____ open and close as heart goes through cardiac cycle.

A

valves

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7
Q

Diastole

A

ventricles relaxed and filling

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8
Q

Systole

A

ventricles contracted and pumping

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9
Q

“Lub” and “Dub” sounds

A

Lub - AV valves closing

Dub - closing of semilunar valves

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10
Q

Myocardial contractile cells

A

“self-excitable” auto rhythmic fibers

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11
Q

Sinoatrial Node (SA) : location and definition

A
  • Located in wall of right atrium

- Natural pacemaker where automatic nervous system modulates rate

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12
Q

5 important steps in the heart beat

A
  1. impulse begins at SA node and travels to AV node
  2. impulse travels to AV bundle
  3. impulse travels down inter ventricular septum
  4. impulse spreads to branches
  5. impulse reaches the Purkinje Fibers and is distributed throughout ventricles.
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13
Q

Right and Left Pulmonary Arteries

A

deliver oxygen-depleted blood from right ventricle to right and left lungs.

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14
Q

Pulmonary Veins

A

return oxygenated blood from lungs to left atrium of heart.

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15
Q

Aorta and Branches

A

systematic arteries that carry oxygen-rich blood from left ventricle to the body.

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16
Q

Coronary Arteries

A

supply oxygenated blood to heart muscle.

17
Q

Blood from body drains into the _____ atrium.

A

right

18
Q

Blood draining on right atrium: what drains the upper body and the lower body?

A

UB - Superior vena cava

LB - Interior vena cava

19
Q

What color is oxygen-rich blood?

A

red

20
Q

What color is oxygen-poor blood?

A

blue