Red blood cells are efficient oxygen transport cells. Of the following characteristics, which is the major contributor to the significant oxygen-carrying capacity of a red blood cell?
A. Red blood cells lack mitochondria.
B. Red blood cells don't divide.
C. Red blood cells are biconcave discs.
D. Red blood cells contain myoglobin.
Answer: C. Red blood cells are biconcave discs.
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Glucose is cotransported with sodium by the sodium-glucose transporter and then removed from the basolateral surface of the cell and into the blood by which process?
a) simple diffusion b) facilitated diffusion c) bulk transport d) active transport
The hormone hCG is necessary to
A. keep the corpus luteum from degenerating. B. cause the endometrium to proliferate. C. destroy the corpus luteum. D. stimulate primary oocytes to divide. E. form the corpus luteum.
The autonomic nervous system controls all of the following except the __________.
A. adrenal gland B. smooth muscle in the walls of the aorta C. cardiac muscle in the right atrium D. skeletal muscle in the rectus abdominis E. parotid salivary gland
The volume of air still remaining after maximum expiration is the
A. tidal volume. B. forced expiratory vital capacity. C. inspiratory reserve volume. D. residual volume. E. expiratory reserve volume.