lec 34 asynchronous class

Question 1

Which of the following can kill you? Please circle or
bold T or F for each statement.
a. Broken hearts (feeling extreme sadness) T / F
b. Injecting KCl (Potassium Chloride) T / F
c. A blood clot T / F
d. Electrocardiogram T / F

Answer 1

a. Broken hearts (feeling extreme sadness) T / F
b. Injecting KCl (Potassium Chloride) T / F
c. A blood clot T / F

Question 2

Heart rate is modulated (modified) by:
A) Parasympathetic branch of the nervous system T / F
B) Sympathetic branch of the nervous system T / F
C) Hormonal input T / F
D) Pacemakers cells T / f

Answer 2

A) Parasympathetic branch of
the nervous system
B) Sympathetic branch of the
nervous system
C) Hormonal input

Question 3

Heart rate is initiated by:
A) Parasympathetic branch
of the nervous system
B) Sympathetic branch of the
nervous system
C) Hormonal input
D) Pacemakers cells

Answer 3

D) Pacemakers cells

Question 4

what effect can the parasympathetic stimulation of pacermaker cells

Answer 4

it can slow down heart rate

by high k efflux and low ca influx

Question 5

what effect does sympathetic stimulation of pacemaker cells have on heart rate

Answer 5

it speeds it up

high Na and Ca influx

Question 6

Why do you think it causes cardiac arrest?
a. High levels of K+ in the blood will increase K+ leaving the pacemaker cell. T / F
b. High levels of K+ in the blood will eliminate the K+ concentration gradient of K+ in the
pacemaker cell. T / F
c. High levels of K+ in the blood will prevent the pacemaker cell from repolarizing. T / F
d. Low levels of K+ in the blood will increase K+ leaving the pacemaker cell. T / F

Answer 6

b. High levels of K+ in the blood will eliminate the K+ concentration gradient of K+ in the
pacemaker cell. T / F
c. High levels of K+ in the blood will prevent the pacemaker cell from repolarizing. T / F

Question 7

What can lead to higher than normal K+ levels in the blood?
a. Reabsorption of K+ in the nephron T / F
b. Not enough K+ secretion in the nephron T / F
c. A diet high in K+ T / F
d. Injection of KCl T / F

Answer 7

a. Reabsorption of K+ in the nephron T / F
b. Not enough K+ secretion in the nephron T / F
c. A diet high in K+ T / F
d. Injection of KCl T / F