A&P: Nerve Pathways & Reflexes

The nervous system processes information in which of the following general ways?

• Through sensory input, integration, and motor output

• By storing information in the spinal cord

• By using only chemical signals

• Through direct muscle stimulation

Nerves are classified based on their function and structure. Which of the following is a correct classification of nerves?

• Sensory, Motor, and Mixed

• Central, Peripheral, and Autonomic

• Cranial, Spinal, and Visceral

• Somatic, Autonomic, and Enteric

Which of the following best describes the function of each part of a reflex arc?

• Sensory neuron transmits impulses to the brain, motor neuron carries impulses to the muscles, and interneuron connects sensory and motor neurons.

• Motor neuron transmits impulses to the brain, sensory neuron carries impulses to the muscles, and interneuron connects motor and sensory neurons.

• Interneuron transmits impulses to the brain, sensory neuron carries impulses to the muscles, and motor neuron connects sensory and interneurons.

• Sensory neuron transmits impulses to the muscles, motor neuron carries impulses to the brain, and interneuron connects motor and sensory neurons.

What is impulse processing dependent on?

• The organization of neurons in the brain and spinal cord

• The speed of nerve impulses

• The type of neurotransmitters used

• The size of the brain

Fill in the blank: Neurons in the CNS are organized into _______ with varying numbers of cells that work together.

• neuronal pools

• neural clusters

• synaptic groups

• axon networks

What effects can neuronal pools have on other pools or peripheral effectors?

• Excitatory only

• Inhibitory only

• Both excitatory and inhibitory

• Neither excitatory nor inhibitory

If the net input is excitatory but does not sum to the threshold potential, what will happen?

• A) A nerve impulse will occur

• B) There will be no nerve impulse

• C) The input will become inhibitory

• D) The threshold potential will increase

In a neuronal pool, if the net excitatory input sums to the threshold potential, (a)   will occur.

• a nerve impulse

• no change

• an inhibitory response

• a decrease in potential

What is facilitation in the context of impulse processing?

• Facilitation is the increase release of neurotransmitter in response to a stimulus

• Facilitation is the process of ignoring all stimuli regardless of prior exposure.
• Facilitation refers to the complete absence of response to any stimulus.
• Facilitation is the reduction of response to a stimulus due to prior exposure.

Facilitation occurs in an excitatory presynaptic neuron upon repeated ________.

• stimulation

• inhibition

• depolarization

• hyperpolarization