Which of the following is a principle of the fluid mosaic model of cell membrane structure?
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
B) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains.
C) The lipid bilayer is a solid at body temperature, thus protecting the cell.
D) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.
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Which of the following is NOT true of the epidural space?
A. It contains cerebrospinal fluid. B. It contains connective tissue and blood vessels. C. It lies between the vertebrae and the dura mater. D. It is the site for epidural injections of anesthetics. E. All of these are true of the epidural space.
The vital centers for the control of visceral activities such as heart rate, breathing, blood pressure, swallowing, and vomiting are located in the ________
A) pons B) medulla oblongata C) midbrain D) cerebrum E) hypothalamus
In which part of a neuron is the postsynaptic membrane usually found?
A. Axon B. Dendrite C. Perikaryon D. Axon collateral E. Axon terminal
Splanchnic nerves are composed of
A. postganglionic sympathetic axons that did not synapse in a sympathetic trunk ganglion. B. postganglionic sympathetic axons that synapse in a sympathetic trunk ganglion. C. preganglionic sympathetic axons that did not synapse in a sympathetic trunk ganglion. D. preganglionic sympathetic axons that synapse in a sympathetic trunk ganglion. E. None of the choices is correct.