Exam 4: Principles of Neural and Hormonal Communication

The following question refers to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by filling the appropriate letter in the blank using the following answer code: -A. permeability of a resting nerve cell membrane to Na⁺ B. permeability of a nerve cell membrane to Na⁺ during the rising phase of an action potential

A change in a membrane potential from -70 mV to -90mV is an example of

Indicate whether the membrane is more permeable to K⁺ or to Na⁺ or is equally permeable to these ions under the stated conditions by writing the appropriate letter in the blank using the following answer code: -during an IPSP

____________________ are long-range chemical mediators secreted by endocrine glands into the blood, which carries them to distant target organs.

Which of the following is true about hormones?

Which of the following nerve fibers will have the highest conduction velocity when compared to an unmyelinated nerve fiber with conduction velocity = 0.35 m/sec.

The accompanying figure relates to neurotransmitter secretion. Match the steps highlighted in the figure (steps 1-5) with the statements using the letter key below. -Action potential reaches axon terminal

The hormones influence adjustments that require duration rather than speed, whereas the rapid coordination of the body are controlled by the nervous system.

____________________ are molecules produced by nerve cells and bind to nonsynaptic receptors.

MATCHING: ART The following questions refer to the accompanying diagram of an action potential. Segments of the action potential are labeled A-D. Match the letters to the corresponding statements below. -Sodium moving through voltage-gated channels