Which structure would contain a simple epithelium?
a. nasal cavity
b. skin
c. lung
d. urinary bladder
e. both a and c
Answer: e. both a and c
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Which is true about mediated transport across cell membranes?
A. As the concentration gradient across a membrane increases, the transport rate always increases. B. It refers both to simple diffusion and to the active transport of molecules. C. It is nonspecific; any transporter can transport any molecule across the cell membrane. D. It is characterized by saturable carriers and a maximum velocity of transport. E. It refers to the movement of ions through protein channels.
What steps are necessary to terminate neurotransmitter action? What would happen if these steps failed?
What will be an ideal response?
Which statement about the cardiac cycle is false?
A. The right and left ventricle go through systole and diastole one after the other. B. The right and left atria go through systole and diastole at the same time. C. The AV valves function together. D. The semilunar valves function together.
A connective tissue is composed of cells and a(n) __________ that consists of fibers and ground substance.
Fill in the blank(s) with the appropriate word(s).