The cells that are actively involved in immunological surveillance are the ________.
A) suppressor T cells.
B) NK cells.
C) plasma cells.
D) B lymphocytes.
E) helper T cells.
B) NK cells.
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What is the name of the column of neurons within the medulla that initiates neural impulses for inspiration and expiration?
A. Pontine respiratory center B. Ventral respiratory group C. Dorsal respiratory group D. Phrenic nucleus
The erythrocyte count increases after a while when an individual goes from a low to a high altitude because the ________.
A) temperature is lower at higher altitudes B) basal metabolic rate is higher at high altitudes C) concentration of oxygen and/or total atmospheric pressure is higher at higher altitudes D) concentration of oxygen and/or total atmospheric pressure is lower at high altitudes
The extra-embryonic membrane that forms the fetal portion of the placenta is the
A) yolk sac. B) amnion. C) allantois. D) chorion.
Potential energy stored in bonds is released as ________ energy
A) heat B) kinetic C) electrical D) electromagnetic E) chemical