Final Exam

Question 1

Compare and contrast contractile cardiac muscle cells with pacemaker cells

Answer 1

cardiac muscle cells - physically contract
pacemaker cells - controls timing of contraction (do not actually physically contract)

Question 2

Draw the action potential for pacemaker cells. Indicate which ion channels are opening and closing

Answer 2

Question 3

draw the action potential for contractile cardiac muscle cell. Indicate which ion channels are opening and closing

Answer 3

Question 4

draw the cardiac cycle in 5 hearts. Include direction blood is flowing and indicate which valves are open/closed.

Answer 4

Question 5

How many times during a single cardiac cycle are all four valves closed?

Answer 5

2

Question 6

How many times during a single cardiac cycle are all four valves open?

Answer 6

none

Question 7

what is the equation for resistance?

Answer 7

Question 8

what is the equation for blood flow?

Answer 8

Question 9

Answer 9

Question 10

what are the three layers of blood vessels?

Answer 10

tunica intima
tunica media
tunica externa

Question 11

what is the function of the tunica intima?

Answer 11

reduce friction of blood

Question 12

what is the function of the tunica externa?

Answer 12

support and protect

Question 13

what is the vasa vasorum?

Answer 13

small blood vessels that feed larger ones