Physioex 9.0

Exercise 6 Cardiovascular physiology

1.   Which of the following types of muscle tissue can depolarize spontaneously in the absence of any external stimulation:
a.   Skeletal muscle
b.   Smooth muscle    
c.   Cardiac muscle
d.   All of the above

4.   True or False:  In order for the heart to function the most effectively in pumping blood, the ventricles must contract and then relax fully with each beat.

21.   Describe why Ringer’s solution is required to maintain heart contractions.

32.   The resting cardiac muscle cell favors the movement of which ion more than others?
a.   potassium
b.   sodium      
c.   calcium
d.   magnesium

36.   Describe how medicines called “calcium channel blockers” are used to treat patients and why?