Upon activation, a T-lymphocyte
A. ceases dividing and becomes a plasma cell.
B. ceases dividing and becomes a memory cytotoxic helper cell.
C. proliferates to form clones and memory cells.
D. proliferates to form B cells and plasma cells.
C
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What type of muscle tissue causes peristalsis?
A. skeletal muscle B. smooth muscle C. cardiac muscle
The X shape of the optic nerves is called the ________.
A. cranial nerve X: Vagus B. macula C. optic chiasma D. optic disc
Which of the following statements is FALSE?
A. Ca2+ that activates contraction of smooth muscles can come from either the ECF or from the sarcoplasmic reticulum. B. In the absence of any neural input, skeletal muscle cannot generate tension. C. A single smooth muscle cell may be innervated by both a sympathetic neuron and a parasympathetic neuron. D. Synaptic input onto skeletal muscle cells is always excitatory, whereas inputs to smooth muscle cells may be either excitatory or inhibitory. E. Contractile activity of smooth muscle cells does not normally require Ca2+.
Which transport process is the main mechanism for the movement of most macromolecules by body cells?
A) secondary active transport B) receptor-mediated endocytosis C) pinocytosis D) phagocytosis