Label C represents which of the following structures?
A) urinary bladder
B) rectum
C) anus
D) urethra
E) sigmoid colon
A) urinary bladder
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Which muscle is not attached in some way to the scapula?
A) teres minor B) deltoid C) sternocleidomastoid D) teres major E) infraspinatus
Before specific defenses are activated, most antigens must
A) infect cells. B) be processed by a phagocyte. C) either infect cells or be processed by a phagocyte. D) depolarize the lymphocyte. E) bind to the DNA of the lymphocyte
Chemicals that signal the same cell that made them are called ________ messengers, while those that signal nearby cells are called_____ messengers.
A. paracrine; endocrine B. autocrine; paracrine C. endocrine; pheromone D. allomone; autocrine E. pheromone; prostaglandin
Which tumor originates in epithelial tissue?
A. Lymphoma B. Sarcoma C. Carcinoma D. Leukemia