The element that is crucial to actual muscle contraction is
a. sodium.
b. potassium.
c. iron.
d. magnesium.
e. calcium.
E
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Indicate whether the statement is true or false
Which of the following does NOT occur during the latent period of muscle contraction?
a. Myosin heads bind to actin filaments. b. Myofibrils shorten. c. Muscle cell membrane initiates an electrical impulse which travels into the muscle cell. d. Calcium is released from the sarcoplasmic reticulum. e. all of these
The common cold is considered to be endemic in the United States
a. true b. false
Hemolytic disease of the newborn can result from an
A) Rh+ mother with an Rh- fetus. B) Rh- mother with an Rh+ fetus. C) AB mother with a B fetus. D) AB mother with an O fetus. E) Rh- mother and an A fetus.