Intrinsic factor is
a. secreted by the parietal cells in the stomach.
b. necessary for absorption of vitamin B12.
c. abundant in pernicious anemia.
d. two of these answers.
e. all of these answers.
D
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Astrocytes
a. induce formation of the blood-brain barrier. b. are important in the repair of brain injuries and in neural scar formation. c. take up excess K+ from the brain ECF. d. physically support neurons. e. all of these answers.
What is the correct sequence of events at a synapse?
(1) neurotransmitter release/diffusion (2) generation of action potential in the postsynaptic cell axon (3) arrival of nerve impulse at synaptic knob in presynaptic cell (4) removal of neurotransmitter molecules from receptors (5) binding of neurotransmitter to receptors A) 3, 1, 5, 2, 4 B) 2, 3, 1, 4, 5 C) 3, 1, 5, 4, 2 D) 1, 5, 4, 2, 3 E) 2, 3, 1, 5,
What is a vertical section through the body, dividing it into left and right, called?
A) frontal B) regional C) sagittal D) transverse
What occurs during spermiogenesis?
A. Cytoplasm removed by Sertoli cells B. Chromosomes are compacted by protamines C. Flagellum and acrosome form D. All of the choices are correct.