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PE (Mrs H) > Cardiovascular system > Flashcards

Cardiovascular system Flashcards

1
Q

Gaseous exchange (external) at rest

A

Oxygen + CO2
At the alveoli:
PPO2 is high
PPCO2 is low

In the blood:
PPO2 is low
PPCO2 is high

Gases travel from high PP to low PP

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2
Q

Gaseous exchange (external) with exercise

A

In the alveoli:
PPO2= high
PPCO2= low

In the blood:
PPO2= highER
PPCO2= lowER

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3
Q

Control (VCC)

A

Vascular shunt

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4
Q

Chemoreceptors

A

increase acidity

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5
Q

Proprioceptors

A

increase movement of the blood

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6
Q

Baroreceptors

A

increase blood pressure

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7
Q

CCC

A

Heart Rate

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8
Q

RCC

A

Breathing

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9
Q

Cardiac cycle

A

A systole, AV node, BoH, purkinje fibres

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10
Q

What happens to SV as exercise intensity increases?

A

increases until sub-max then gradually decreases

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11
Q

What affects SV

A 
venous return- sterlings law (as much blood returns)
ventricular stretch (more blood=ore contraction)
aortic and pulmonary artery pressure
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12
Q

explain the journey with vascular shunt

A

arterioles - capillary beds - vasoconstrict/ dilate

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13
Q

Inspiration at rest

A

external intercostal muscles pull ribcage up and out - diaphragm contracts - volume of thoracic cavity decreases, pressure increases - gases move high to low and air moves in

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14
Q

Expiration at rest

A

opposite of inspiration

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15
Q

Inspiration during exercise

A

same as rest but greater- sternocleidomastoid moves ribs forcefully

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16
Q

Expiration during exercise

A

same as rest but more forcefully- internal intercostal creates more force with ribs

17
Q

what is the dissociation of O2 from Hb affected by

A

increase in temp
decrease in po2 in muscle
increase in pco2 in muscle
bohr effect

18
Q

what happens to hb dissociation during exercise

A

more o2 unloading from the blood in muscle cell

19
Q

What is pulmonary ventilation?

A

breathing in and out

PE (Mrs H) (8 decks)

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