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Medsci 142 > Lecture 8+9: blood circuits and the heart > Flashcards

Lecture 8+9: blood circuits and the heart Flashcards

1
Q

systemic veins carry

A

deoxygenated blood to the heart

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2
Q

output of heart

A

14,000L of blood output per day
5L blood per minute

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2
Q

systemic arteries carry

A

oxygenated blood away from heart

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3
Q

location of blood volume

A

7% in heart
9% in pulmonary circuit
84% in systemic circuit

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4
Q

pulmonary arteries carry

A

deoxygenated blood to lungs

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5
Q

pulmonary veins carry

A

oxygenated blood to heat

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6
Q

relationship between chamber volume and pressure

A

high volume low pressure
low volume high pressure

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7
Q

purpose of atrium and auricle

A

means blood can continuous collect and flow even while inlet valve to ventricle is closed

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8
Q

peak pressure

A

Right ventricle:27 mmHg (20-35)
left ventricle: 120mmHg (100-140)
right atrium: 5 (0-5)
left atrium: 8mmHg (4-8)

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9
Q

pulmonary trunk purpose

A

carries deoxygenated blood from right ventricle to lungs

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10
Q

mitral valve

A

bicuspid atrioventricular valve between left atrium and left ventricle

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11
Q

apex of heart orientation

A

relative to patient:
point inferiorly, anteriorly and to the left

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12
Q

orientation of heart’s right border

A

relative to patient:
right atrium primarily

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13
Q

orientation of hearts inferior border

A

relative to patient: formed mainly by right ventricle

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14
Q

orientation of heart left border

A

formed mainly by left ventricle and part of left atrium/auricle

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15
Q

base of the heart

A

blood vessels, superior border

16
Q

5 stages of cardiac cycle

A
  1. ventricular filling
  2. atrial contraction
  3. isovolumetric ventricular contraction (systole)
  4. ventricular ejection
  5. Isovolumetric ventricular relaxation
17
Q

ventricular filling

A

blood fills ventricle from atrium from veins. Ventricular P < atrial P

18
Q

atrial contraction

A

SA node fires and atrium contracts forces the last bit of blood from atrium into ventricle. mitral and tricuspid valves only open

19
Q

Isovolumetric ventricular contraction (systole)

A

ventricle contracts. pressure in arterial P > ventricle P > atrial P . mitral and tricuspid valve closes, blood turbulence causes first heart sound (lub). all valves closed

20
Q

ventricular ejection

A

systole continues but now Ventricular P > arterial P and aortic and pulmonary valves open. blood leaves ventricles via veins. semilunar valves only open

21
Q

isovolumetric ventricular relaxation

A

ventricle relaxes. arterial pressure > ventricular P > atrial pressure. flow in artery reverse back towards heart so aortic valve and pulmonary valves closes, turbulence. creating second heart sound (dub). all valves closed

Medsci 142 (27 decks)

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