Local hormones that act on neighboring cells are called:
A) Exocrines
B) Paracrines
C) Circulating hormones
D) Autocrines
Ans: B) Paracrines
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Which does NOT apply to hormones?
A. They are secreted into the blood by ductless glands. B. All hormones are derived from cholesterol. C. They are sometimes secreted by neural tissue. D. In some cases, the same chemical substances can also function as local regulators and/or neurotransmitters. E. They are chemical regulators that are conveyed from one organ to another via the bloodstream.
The dura mater surrounding the brain consists of two layers. Give a functional reason for the fact that there are two layers instead of only one.
A. The two layers form a stronger blood-brain barrier. B. Arteries are sandwiched between the layers. C. Spaces between layers collect blood for return to the venous system. D. The spaces are where cerebrospinal fluid is reabsorbed. E. Fluid between the layers reduces friction.
In an isotonic contraction, about 50 percent of the energy consumed is realized as external work and the remaining 50 percent is converted to heat
Indicate whether the statement is true or false
Which tissue layer provide for primary digestive motility?
a. mucosa. b. submucosa. c. muscularis mucosa. d. muscularis externa. e. mesentery.