In skeletal muscle, an action potential leads directly to ________
a. the binding of actin with myosin
b. the detachment of troponin from actin
c. flexure of the already bound myosin heads
d. the release of calcium from the sarcoplasmic reticulum
d
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What respiratory adaptation was important for the invasion of land by arthropods?
A. positive pressure breathing to increase gas exchange B. cutaneous respiration in moist habitats C. gas- and water-permeable exoskeletons D. the ability to close spiracles to prevent water loss E. countercurrent exchange surrounding the trachea
In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes?
A) 200; 50 B) 100; 50 C) 100; 100 D) 50; 50 E) 200; 200
Organize the sequence of structures through which sperm must pass upon ejaculation
1) urethra 2) ejaculatory duct 3) epididymis 4) vas deferens a. 3 ? 2 ? 1 ? 4 b. 3 ? 4 ? 2 ? 1 c. 2 ? 3 ? 4 ? 1 d. 2 ? 4 ? 3 ? 1 e. 4 ? 3 ? 2 ? 1
Regulation of the passage of food from the stomach is accomplished by
A) peristalsis. B) nutrient absorption. C) sphincters. D) the stomach lining.