Which of the following is not a reason muscular weakness tends to develop in old age?
A. There are fewer and smaller mitochondria in aged muscle.
B. Aged muscle has less glycogen, myoglobin, and creatine phosphate.
C. The muscle fibers of aged muscle no longer synthesize myosin.
D. Aged muscle fibers have fewer myofibrils.
E. There are fewer motor neurons in the spinal cord.
Answer: C
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The major lipids in cellular membranes are phospholipids.
Answer the following statement true (T) or false (F)
Saliva is
A) stimulated by sympathetic innervation. B) slightly acidic, with a pH of 6-7. C) secreted from endocrine glands. D) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system. E) controlled by the autonomic nervous system.
Opening and closing of the heart valves is caused by ________.
A. osmotic gradients B. pressure gradients C. gravity D. valves contracting and relaxing E. breathing
The gene that codes for the testis-determining factor (TDF) is found in or on the ________
A) fetal testes B) gonadal ridges C) Y chromosome D) mesonephros E) X chromosome