What comprises a motor unit?
A. One neuromuscular junction
B. The distance from one Z disc to the next
C. One thick filament and all thin filaments with which it forms cross-bridges
D. One nerve fiber and all the muscle fibers innervated by it
E. One myofibril of a muscle fiber
D. One nerve fiber and all the muscle fibers innervated by it
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The structure labeled 3 in the diagram is a
a) somatic motor neuron. b) parasympathetic preganglionic neuron. c) parasympathetic postganglionic neuron. d) sympathetic preganglionic neuron. e) somatosensory neuron.
Transportation functions of the circulatory system include ________.
A. carrying metabolic waste B. carrying oxygen and carbon dioxide C. carrying leukocytes D. carrying absorbed products of digestion E. All of the choices are correct.
Answer the following statements true (T) or false (F)
1. An electron in the third energy level is closer to the nucleus than an electron in the second energy level. 2. All compounds are molecules, but not all molecules are compounds. 3. The bond between carbon and hydrogen in an organic compound is an example of a covalent bond. 4. Water is the most abundant solute in the body. 5. Chemical bonds can store potential chemical energy.
There are several reasons other than genetics for hair loss. Identify some of these other factors.
What will be an ideal response?