Ribosomes are found __________.
A)only in the nucleus
B)in the cytosol and on the rough endoplasmic reticulum
C)only on the endoplasmic reticulum
D)only in the cytosol
B)in the cytosol and on the rough endoplasmic reticulum
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Which of the following is NOT a property of single -unit smooth muscles?
A) Electrical responses travel directly between cells. B) All smooth muscle cells are connected by gap junctions. C) Each cell functions independent of its neighbor. D) Their contraction occurs in a coordinated manner. E) Only a proportion of the smooth muscle cells receive autonomic nervous input.
Many hours after a meal, alpha (?) cells in the pancreatic islets secrete _________, which _________ blood glucose.
A. glucagon; lowers B. glucagon; raises C. insulin; lowers D. insulin; raises E. glucocorticoids; raises
What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
A. There are no internodes in unmyelinated fibers. B. Facilitated diffusion of sodium and potassium is faster in myelinated fibers. C. There are more internodes in unmyelinated fibers. D. Diffusion of ions along the axoplasm is faster. E. Active transport of sodium and potassium is faster in myelinated fibers.
The simplest reflex is the:
a. polysynaptic b. stretch c. monosynaptic d. withdrawal e. both (b) and (c)