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A&P II > 4.3 Physiology of the Cardiovascular System Part 2 > Flashcards

4.3 Physiology of the Cardiovascular System Part 2 Flashcards

1
Q

What is heartbeat also known as?

A

cardiac cycle

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2
Q

What are the three general phases of the cardiac cycle?

A
  1. atria contract while ventricles relax (0.15s)
  2. ventricles contract while atria relax (0.30s)
  3. all chambers relax (0.40s)
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3
Q

What are the sounds of the heartbeat?

A

lub dub

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4
Q

What is the first lub?

A

when the atrioventricular valves close

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5
Q

What are the atrioventricular valves?

A

bicuspid
tricuspid

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6
Q

What is the dub sound?

A

when the semilunar valves close

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7
Q

What does systolic pressure result from?

A

blood being forced into the arteries during ventricular systole

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8
Q

What is diastolic pressure?

A

pressure in the arteries during ventricular diastole

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9
Q

What is the medical device that measures blood pressure?

A

sphygomanometer

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10
Q

What does blood pressure measure?

A

the amount of pressure required to stop the flow of blood through an artery

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11
Q

What is the normal artery that blood pressure is taken at?

A

brachial artery

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12
Q

What is used to squeeze are into the bladder?

A

bulb

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13
Q

What is placed over the artery to measure blood pressure?

A

the cuff

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14
Q

What displays the pressure and in what unit?

A

manometer/ mmHg

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15
Q

What is the normal reading for blood pressure?

A

120/80

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16
Q

What is the numerator and what is the denominator in blood pressure readings?

A

systolic/diastolic

17
Q

What happens to the difference in pressure between systolic and diastolic when blood reaches the arterioles?

A

the difference will diminish

18
Q

What are the factors that enable blood to return to the heart in veins that have low pressure?

A
  1. low resistance in venous walls
  2. internal valves in veins prevents backflow
  3. muscular contraction assists flow rate in veins
19
Q

What maintains the intrinsic rhythmic abilities of the heart?

A

electrical impulses

20
Q

What systems help regulate heart rate?

A

nervous system
endocrine system

A&P II (95 decks)

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