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MSPC237 > Cardiovascular Physiology > Flashcards

Cardiovascular Physiology Flashcards

1
Q

Endocrine functions of the cardiovascular system

A

Secretion of Atrial natriuretic peptide
B-Type natriuretic peptide

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2
Q

ANP (by atrial myocytes) -

A

promotes sodium and water excretion and also reduces vascular resistance

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3
Q

B-Type natriuretic peptide

A

decreases vascular resistance

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4
Q

Which natriuretic peptide is more potent

A

ANP

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5
Q

Other name for the pacemakers

A

Central Pattern Generator

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6
Q

dominant pacemaker in health

A

SA node is the

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7
Q

Impulse pathway

A

Sinoatrial node → AV node → Bundle of His → Bundle Branches → Purkinje fibers

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8
Q

Slowest conduction velocity in the cardiac conduction pathway

A

AV node

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9
Q

What is the speed of the impulse at the AV node

A
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10
Q

How long does it take for an action potential to pass through the AV node?

A
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11
Q

Where on the heart does the cardioaccelerators(sympathetic)

A

SA nodes
AV nodes
Cardiac muscles

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12
Q

How does the Cardioaccelerators(sympathetic) affect the ventricular muscles

A

Ventricular muscles, increasing force of contraction

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13
Q

How do the cardioaccelerators(sympathetic) affect the AV node SA node

A

Increasing Frequency of action potential firing

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14
Q

How does the cardioaccelerators(sympathetic) affect the AV node

A

Speed of conduction at AV node

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15
Q

CAn is the impact of a calcu=ium

A
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16
Q

What is a positive
i)lusitropy
ii) chronotropic effect
iii) dromotropy
iv)Inotropy

A

i)Myocardial relaxation
ii) Increase heart rate
iii) Speed of Conduction of Action potential
iv) Increase force of contraction

17
Q

SA node does not have a stable resting potential what is this called

A

Phase 4 ( spontaneous depolarization)

18
Q

What is the impact of Ca channel blockers on the shape of the action potential in ventricular muscle?

A

Width of AP will be reduced
Less strong ventricular contraction

MSPC237 (8 decks)

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