Exam 4: Principles of Neural and Hormonal Communication

Which of the following statements concerning hormones is incorrect?

During the resting potential, many potassium channels are open in the plasma membrane.

One target cell receptor may bind with more than one type of hormone.

Use the answer code to answer the questions in this section: -Permeability change that occurs at threshold.

The stronger the triggering event:

Indicate whether the characteristics below apply to the endocrine system or the nervous system by writing the appropriate letter in the blank using the following answer code: -Specificity is dependent on specificity of target-cell receptors.

In which way can a hormone's response at the target tissue be modified?

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. -Time when Na-K pump reestablishes resting conditions

Indicate whether the characteristics below apply to the endocrine system or the nervous system by writing the appropriate letter in the blank using the following answer code: -Chemical messengers act at a long distance from their site of secretion.

Indicate whether the characteristics below apply to the endocrine system or the nervous system by writing the appropriate letter in the blank using the following answer code: -Structural continuity in the system.

Each letter is used only once. -myelin

____________________ are hormones released into the blood by neurosecretory neurons.

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. -Repolarizing phase

The current flow of a action potential fades quickly.

Indicate which characteristic applies to classical neurotransmitters and neuropeptides using the following answer code: -usually open specific ion channels in cell on which they act

The ______ effect is a multiplying effect of second messenger pathways.

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 nerve cell membrane to Na⁺ during the falling phase of an action potential B. permeability of a nerve cell membrane to K⁺ during the falling phase of an action potential

Peak potential of an action potential is usually +30 to +40 mV.

At the synapse, a presynaptic neuron signals a(n) ____________________ neuron.

After an action potential has occurred, there is more Na? inside the cell than outside the cell (before any Na?-K? pump activity has taken place).