In an experimental situation, a virus is injected into a rabbit and the rabbit is allowed to make antibodies for the viral antigen. These antibodies are then removed from the rabbit plasma and injected into a human to help combat the same viral disease. This is an example of __________.
A) natural immunity.
B) innate immunity.
C) passive immunization.
D) active immunization.
E) autoimmunity.
C) passive immunization.
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The major targets of growth hormone are ________.
A) the blood vessels B) the adrenal glands C) the liver D) bones and skeletal muscles
Cortisol:
a. is made in the middle zone of the adrenal cortex b. is a glucocorticoid c. has an anti-immunity effect d. all of the above
Each gustatory cell extends a ________ into the surrounding fluids through a narrow taste pore.
A) taste bud B) papilla C) taste hair D) basal cell E) neuron
Why can't tetany of the heart occur?
a. there are no distinct motor units in the heart. b. there is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c. the refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction. d. the heart contracts with maximal force every beat so it is impossible to increase the strength of cardiac contraction. e. vagal stimulation slows down the heart rate to prevent summation of contractions.