How do striated and smooth muscles differ?
A) Striated muscle is involuntary, but smooth muscle is voluntary.
B) Striated muscle has a banding pattern under the microscope, but smooth muscle doesn't.
C) Striated muscle can contract for a long period, but smooth muscle contracts very briefly.
D) Striated muscle cells have nuclei, but smooth muscle cells do not.
B
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Plant secondary compounds are chemicals that
(a) have no known metabolic function in the plant. (b) are required for enzyme function. (c) are generally carbohydrates or proteins. (d) are important in cell division.
Which of the following is a muscle tissue that pumps blood throughout the body?
A. Skeletal muscle B. Cardiac muscle C. Smooth muscle D. Endocardium
Water can diffuse directly across lipid bilayers, but ions cannot. What aids the ions in water in entering or exiting a
cell? a. transport proteins in a cell’s cytoplasm b. transport proteins in a cell’s plasma membrane c. sugars produced in source regions d. organic compounds stored in plant tissues e. companion cells
Synaptic integration means
a. all positive or excitatory stimuli are added together. b. the positive and negative ions neutralize each other. c. excitatory and inhibitory signals are combined in a neuron. d. the adjacent neurons interact so that excitatory and inhibitory stimuli cancel each other out. e. that an interneuron is involved.