From which primary germ layer do both the skeletal and muscular systems develop?
A. Endoderm
B. Ectoderm
C. Mesoderm
D. None of these choices are correct for both systems.
Answer: C
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The final step in the formation of a blood clot is
A) the formation of prothrombin activator. B) tissue damage. C) that prothrombin activator converts prothrombin to thrombin. D) that thrombin converts fibrinogen to fibrin.
Conduction by local current flow
a. occurs in unmyelinated fibers. b. is faster than propagation of an action potential in myelinated fibers because myelin acts as an insulator to slow down the impulse. c. involves current flowing locally between the active and adjacent inactive areas, thereby bringing the inactive areas to threshold so that they too become active (i.e., have an action potential). d. both (a) and (c) above. e. all of these answers.
Which of the following correctly describes water movement across the epithelial cells lining the collecting duct?
A) Water can permeate the lipid bilayer at all times. B) Water can permeate the phospholipid bilayer only in the presence of aldosterone. C) Water can permeate the apical membrane through aquaporin-2 and the basolateral membrane through aquaporin-3, but aquaporin-2 is only present in the presence of ADH. D) Water can permeate the basolateral membrane through aquaporin-2 and the apical membrane through aquaporin-3, but aquaporin-2 is only present in the presence of aldosterone. E) Water can permeate the phospholipid bilayer only in the presence of ADH.
Diagnosis of an indirect inguinal hernia is determined when intestine protrudes lateral to the inferior epigastric artery through the abdominal body wall. During the phys- ical examination of a male patient, a physician will assess for an indirect hernia by inserting a finger in the scrotum and feeling for bowel that protrudes, as the patient is instructed to turn his head and cough. If an indirect inguinal hernia is present, the physician will most likely feel bowel at which of the following sites?
A. Anterior superior iliac spine B. Deep inguinal ring C. McBurney's point D. Pubic symphysis E. Superficial inguinal ring