Widely distributed phagocytic cells that remain fixed in position are part of the
________ ________ _______.
Fill in the blank(s) with correct word
mononuclear phagocytic system
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One of the key features of epithelial tissue that differentiates it from the other three types of tissue is
A) the density of the tissue, with cells connected very closely. B) semipermeability. C) its ability to reproduce. D) the ability to carry large amounts of oxygen. E) its control over the other tissues.
The structures that cover the surfaces of bones where they meet one another are called ________.
Fill in the blank(s) with the appropriate word(s).
The glomerular filtrate
a. is a protein-free plasma. b. is formed as a result of passive forces acting across the glomerular membrane. c. does not contain foreign compounds because these substances are secreted by special transport mechanisms in the proximal tubule instead. d. both (a) and (b) above. e. all of these answers.
Receptor molecules in synapses
A. serve as channel proteins. B. have a high degree of specificity. C. tend to concentrate on presynaptic terminals. D. can bind to any molecule in the synapse. E. bind irreversibly with neurotransmitter.