The refractory period of cardiac muscle
a. lasts almost as long as the contraction period
b. is much longer than the refractory period in skeletal muscle
c. prevents tetanic contraction of the heart to occur to ensure smooth, coordinated ejection of blood from the ventricles
d. is important for all of the above reasons
e. is important for only reasons a and b
D
You might also like to view...
Along with tibialis anterior, which of the following muscles is often referred to as a "stirrup" muscle?
a. Fibularis tertius b. Fibularis longus c. Fibularis brevis d. Flexor hallucis longus
Cells that form a myelin sheath in the CNS are called __________.
Fill in the blank(s) with the appropriate word(s).
________________ and coitus mean sexual intercourse
Fill in the blank(s) with correct word
Which of the following is associated with the relaxation phase?
a. Muscle tension declines. b. Calcium levels in the cytoplasm fall. c. Myosin releases thin filaments. d. ACh levels in the cleft increase.