Exam 10: Nervous System I: Basic Structure and Function

A motor neuron in the arm has an axon that branches to innervate several muscle groups and cause them to contract all at once. This branching is an example of ________.

A neuron in the skin detects tissue damage in the skin during a burn and informs the brain and spinal cord. This neuron is part of the ________ pathway.

Presynaptic neurons release neurotransmitters by ________.

Axon branches are called collaterals.

Sensory receptors

Organize the following list of bodily functions and actions according to whether they are controlled by the somatic nervous system or autonomic nervous system: heart rate, walking, looking to the left, digestion, vasoconstriction, biceps femoris contraction.

A nerve cell membrane becomes depolarized as a result of

Marjorie takes an anti-anxiety drug so that she can sleep better and remain calm enough to study effectively. She begins by taking 25 milligrams every evening, but within a month this dose is no longer helping, so she takes two pills. After another month this dosage is no longer effective. This is happening because

Which cells produce myelin in the brain and spinal cord?

The somatic nervous system controls voluntary actions and the autonomic nervous system oversees involuntary actions.

In reuptake

Which of the following cells is found only in the PNS?

A neuron is stimulated, which changes membrane potential to the point where voltage-gated Na⁺ channels open and begin depolarizing the cell. The neuron has reached

A series of similar stimuli that induces change in local membrane potential is called ________.

Diverging axons amplify an impulse by

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ________ potential.

A neuron may have

The types of neurons that are organized into neuronal pools are

Interneurons are specialized to carry impulses from receptor cells into the brain or spinal cord.

When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of