Cardiovascular Physiology #5 9/22/15 Flashcards

1
Q

_______ is the same for all vascular beds.

A

Delta P (Perfusion pressure)

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2
Q

MAP = ? * This

A

Cardiac output x total peripheral resistance (TPR) *MAP = CO X TPR

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3
Q

What is TPR?

A

The sum of the resistances to flow offered by all the systemic blood vessels

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4
Q

Why is MAP important?

A

it determines organ blood flow.

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5
Q

Flow = ?

A

Flow = Change in pressure/resistance of arterials to that organ

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6
Q

Change in pressure = ?

A

= Flow x Resistance

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7
Q

CO = ?

A

Heart rate x Stroke volume

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8
Q

To increase heart rate, Sympathetic nervous system acts on______ receptors In the _____ and has what effect?

A

Beta-1 receptors
Atria
Increases Na+ entry, which increases heart rate.

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9
Q

How do Sympathetics regulate stroke volume?

A

Beta-1 receptors in the ventricles (Increases contractility and increases stroke volume)

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10
Q

Beta-1 receptors are in the _____, Alpha receptors are in the _______.

A

Heart

Vasculature

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11
Q

Blood loss causes a reduction in _______.

A

MAP, Ultimately b/c you are decreasing stroke volume, cardiac output,….

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12
Q

What happen if MAP drops?

A

Less blood flow to organs = not good!

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13
Q

What are Baroreceptors?

A

Neurons that function as homeostatic maintenance of MAP by constantly monitoring in the aortic arch and carotid sinuses.

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14
Q

How do Parasympathetics affect heart rate?

A

They act on muscarinic receptors in the atria, decreasing funny channel, decreasing heart rate.

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