Helper T cells:
A. are activated by antigen presented with MHC II proteins.
B. secrete antibodies that target specific antigens.
C. secrete perforin when activated.
D. convert to plasma cells after they are activated.
E. do not interact with MHC proteins.
A
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The interconnecting tiny arches of bone tissue found in spongy bone are called
A) osteons. B) trabeculae. C) concentric lamellae. D) interstitial lamellae. E) lacunae.
The effects of activating the complement system include all of the following except
A) destruction of target cell plasma membranes. B) stimulation of inflammation. C) inhibition of the immune response. D) opsonization. E) chemotaxis.
The temperature yesterday was an uncomfortable 98° F. You unwisely chose to play tennis at noon, counting on your body's internal defenses to protect you against heat exhaustion. How did your body respond to this distress?
What will be an ideal response?
The tightly coiled tube that lies along the top and sides of the testes is the:
a. epididymis b. ductus deferens c. ejaculatory duct d. urethra