Lecture 10 controlling the heart

Question 1

Blood flow in…

Answer 1

• Fills arteries
• Increases arterial blood pvolume
• Raises arterial pressure

Question 2

Blood flow out…

Answer 2

• Drains arteris
• Decreases arterial blood volume
• Lowers arterial blood pressure.

Question 3

Arterial pressure is…

Answer 3

Cardiac output x Total peripheral resistance

Question 4

Cardiac output can be measured by…

Answer 4

SV x HR (Stroke volume L/beat x Heart rate beats/min)

Question 5

Which of the following statements is true about electrical and contractile cells?
A. Electrical cells have nuclei, while contractile cells do not.
B. Electrical cells have less actin/myosin filaments than contractile cells
C. Electrical cells are heavily striated while contractile cells are pale with fewer striations.

Answer 5

B

Question 6

What do baroreceptors do?

Answer 6

They relay information derived from blood pressure within the autonomic nervous system.

Question 7

Where are baroreceptors located?

Answer 7

Within the carotid sinuses and the aortic arch.

Question 8

How does signaling through the vagus nerve affect the heart?

Answer 8

It slows the conduction from the sinus node and reduces conduction via the AV node.

Question 9

How does signaling through the sympathetic trunk ganglion affect the heart?

Answer 9

It increases the heart rate.