Flexion at the knee involves ________
A) isotonic contraction of both the hamstring group and the quadriceps femoris group
B) eccentric contraction of the hamstring group and concentric contraction of the quadriceps femoris group
C) concentric contraction of the hamstring group and eccentric contraction of the quadriceps femoris group
D) isometric contraction of the hamstring group and isotonic contraction of the quadriceps femoris group
C
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A) B B) C C) A D) D E) E 1) Glomerulus. 2) Afferent arteriole. 3) Collecting duct. 4) Nephron loop. 5) Peritubular capillaries. 6) Structure most closely associated with granular cells. 7) Which label marks a structure at the medulla of the kidney?
How many types of extracellular chemical messengers or signal molecules are used for indirect cell communication in the body?
a. two b. three c. four d. five e. six
Anaerobic metabolism is the primary source of ATP production in ________.
A. skeletal muscle cells B. neurons C. red blood cells D. white blood cells
Which of the following is an example of a permissive effect of a hormone?
a. the effect of thyroid hormones on growth. b. the effect of insulin on glucose uptake by cells. c. the effect of sex hormones on the secretion of growth hormone d. a and c e. all of the above