Compare the major characteristics of the three types of skeletal muscle fibers
What will be an ideal response?
The three types of skeletal muscle fibers are slow oxidative, fast oxidative, and fast glycolytic. Slow oxidative fibers have slow Myosin-ATPase activity, are slow to contract but resistant to fatigue. Because they are oxidative they have many mitochondria and have a large blood flow and myoglobin count. This causes the fiber to have a red color. Fast oxidative fibers are similar to the slow oxidative type except that the Myosin-ATPase activity is higher and they are more susceptible to fatigue. The fast glycolytic fibers have fast Myosin-ATPase activity and are thus fast to contract but easily fatigued. Because they are glycolytic and not oxidative they have few mitochondria and a smaller blood flow and myoglobin count. This causes the fiber to have a white color.
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Which of the following is true of adulthood?
a. growth hormone exerts no effects on body tissues. b. The secretion of growth hormone ceases altogether. c. Growth hormone cannot stimulate increases in the length of long bones. d. The structure of bone becomes permanently fixed. e. none of the above.
In the following transverse CT scan through the neck, the arrow points to the:
A) esophagus. B) trachea. C) thyroid gland. D) body of the 6th cervical vertebrae. E) spinal cord.
When transmission occurs at a synapse, neurotransmitter is released by
A. the presynaptic neuron's synaptic knob into the synaptic cleft. B. the postsynaptic neuron's telodendria into the axon hillock. C. the postsynaptic neuron's dendrites into the synaptic cleft. D. the presynaptic neuron's soma into synaptic vesicles. E. the presynaptic neuron's dendrites into the synaptic cleft.
A strong sheet of connective tissue called the ________ extends from the iliac crest to the lateral condyle of the tibia and helps stabilize the knee.
Fill in the blank(s) with the appropriate word(s).