Match the structures with the accurate description.
1. inward extensions of the muscle cell membrane
2. highly organized bundles of contractile proteins within a skeletal muscle cell
3. a single muscle cell
4. the muscle cell membrane
5. a bundle of adjacent muscle cells
A. muscle fiber
B. fascicle
C. sarcolemma
D. myofibril
E. t-tubules
1. E. t-tubules
2. D. myofibril
3. A. muscle fiber
4. C. sarcolemma
5. B. fascicle
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Arrange the following steps of muscle fiber contraction in the correct sequence.1. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.2. Thin filaments are pulled over the thick filaments.3. Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.4. The impulse arrives at the synapse and travels through the transverse tubules.5. The muscle fiber shortens and contracts.6. Myosin heads bind to exposed active sites on actin, forming cross-bridges.
A. 4, 1, 3, 5, 6, 2 B. 4, 3, 6, 2, 5, 1 C. 4, 1, 3, 6, 2, 5 D. 4, 1, 3, 2, 6, 5
Normal whole blood contains ________ g of hemoglobin per 100 mL
A) 4-8 B) 12-18 C) 15-20 D) 30-35 E) 42-48
At a capillary bed, a vasoconstrictor
A. stimulates precapillary sphincters and decreases local blood flow. B. constricts local arterioles, thereby increasing pressure and increasing local blood flow. C. constricts precapillary sphincters and thereby increases local blood flow. D. dilates local arterioles, thereby increasing pressure and increasing local blood flow. E. inhibits precapillary sphincters to relax and decreases local blood flow.
Urine flows through the organs of the urinary system in the following sequence:
a. ureter, kidney, bladder, urethra b. kidney, bladder, ureter, urethra c. kidney, urethra, bladder, ureter d. kidney, ureter, bladder, urethra