Which of the following provides collateral arterial circulation in the legs?
a. genicular arteries
b. great saphenous vein
c. ulnar collateral
d. both a and b
Answer: d. both a and b
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Helen is a 62-year-old smoker. Her physician has diagnosed her as having emphysema that has caused her to hypoventilate. Surprisingly, when her blood pH is checked, it is 7.40. Why?
What will be an ideal response
Histology is the study of the __________.
Fill in the blank(s) with the appropriate word(s).
A heavyset middle-aged insurance salesman, who doesn't exercise often, accepts his friend's invitation to a pickup basketball game. When attempting a jump shot, he falls to the ground in pain, grasping at the calf of his leg. There is an enormous bulge in his leg immediately below the popliteal fossa, and he is unable to plantar flex that foot. Most likely he has injured his ________ and the bulge is ________.
A. calcaneal tendon; his triceps surae B. hamstrings; a large hematoma (blood clot) C. tibia; a previously undetected bone tumor D. patellar ligament; his fibularis longus E. quadriceps tendon; his rectus femoris
What is the main mechanism behind the functioning of nonsteroid hormones?
a. Negative feedback. b. Hypersecretion. c. Second messenger mechanism. d. Positive feedback.