The function of T tubules is to
A) bind actin and myosin molecules together.
B) help distribute the electrical signal to contract throughout the muscle fiber.
C) bind muscle fibers together at the neuromuscular synapse.
D) separate one muscle fiber from another to facilitate partial contraction of a muscle.
E) None of the answers are correct.
B) help distribute the electrical signal to contract throughout the muscle fiber.
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The heart has been estimated to consume 20-30 times its own weight in ATP each day, and mitochondria comprise about 30% of the volume of a cardiomyocyte. In the normal adult heart, fatty acids supply about 60-80% of the organ’s energy needs, with most of the remainder being supplied by glucose. Mitochondrial fatty acid breakdown to yield ATP is called beta oxidation (Chapter 25). When oxygen supplies are limited, cardiomyocytes increase their use of glucose. Aerobic glucose metabolism consumes less oxygen than beta oxidation, and anaerobic glycolysis does not depend on oxygen.
a. increase glucose consumption. b. decrease glucose consumption. c. increase fatty acid consumption. d. increase protein consumption.
Which of the following are NOT peripheral nerves associated with the brachial plexuses?
A) axillary nerves B) femoral nerves C) radial nerves D) ulnar nerves
A small gene with 210 base pairs in sequence would specify a polypeptide containing how many amino acids?
A)21 B)70 C)630 D)105 E)210
Betsy took a fall and broke her arm, which required that she wear a cast for a prolonged period of time. When she took the cast off, she was alarmed to see that her muscles
A. had undergone hypertrophy. B. seemed to have an increase in blood flow. C. looked the same as they did before the fall. D. had undergone atrophy.