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.
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.
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The two heads of the gastrocnemius muscle converge to insert onto __________.
A. the calcaneus B. digits two through five C. the middle phalanx of digit one D. the posterior surface of the tibia
Which of the following statements is false?
A) Five major ligaments help stabilize the shoulder joint. B) The shapes of the articulating surfaces within the joint help prevent movement in a particular direction and strengthen and stabilize the joint. C) The tighter two bones are held together within a joint, the stronger the joint. D) The more movement a joint allows, the stronger the joint. E) The tension produced by muscle tendons surrounding a joint help stabilize the joint.
Match the following muscle actions:
A) Extensor pollicis longus and brevis B) Flexor carpi ulnaris C) Extensor carpi radialis longus and brevis D) Flexor digitorum profundus 1) Flexes the wrist. 2) Slow-acting finger flexor. 3)Powerful wrist flexors that also stabilize the wrist during finger extension. 4) Extends and abducts the wrist. 5) Extends the thumb.
Which layer of the epidermis will be supplied with the highest levels of oxygen from the blood?
A) stratum corneum B) stratum spinosum C) stratum granulosum D) stratum basale