Triceps brachii is opposed in extension of the elbow by the antagonistic muscle
A) brachialis.
B) pronator teres.
C) extensor olecranis.
D) extensor digitorum.
E) anconeus.
A) brachialis.
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Which of the following statements is incorrect or false?
A) Haptens lack immunogenicity unless attached to protein carriers. B) Class 1 MHC molecules are built into the plasma membranes of all body cells. C) Class II MHC molecules appear only on the surface of antigen-presenting cells, thymic cells, and T cells that have been activated by exposure to antigens. D) MHC proteins are the cell’s identity markers.
Siegfried experiences a hemorrhage in an artery, and now blood is leaking out of the resulting hole. His blood pressure decreases. Draw a flow chart illustrating the cardiovascular reflex responses that follow to compensate for the drop in blood pressure.
What will be an ideal response?
Carbon can form ___ covalent bonds
A) 8 B) 1 C) 4 D) 2
Arnold enters a darkened movie theater on a sunny summer afternoon. It takes many
minutes for his eyes to adapt to the darkness because A) it takes some time for the retina to rebuild its rhodopsin stores from opsin and retinal. B) the rods in the eye work only in bright light, and it takes time for the cones to work in weak light. C) the optic nerve fatigues in bright light, and it takes time to recover. D) the iris takes time to close after being subjected to bright light.