Intro to nervous system exam review

Saltatory conduction is a faster type of nerve impulse transmission that occurs along myelinated axons. Why is nerve impulse transmission faster in myelinated neurons?

The nerve impulse can jump from one node of Ranvier to the next, speeding the rate of nerve impulse transmission.

The part of the neuron that typically conducts nerve impulses away from the cell body is the ________.

axon

Fibers that carry information from the skin, joints, and skeletal muscles to the central nervous system are ________.

both somatic and sensory

The term central nervous system refers to the ________.

brain and spinal cord

What type of neuron connects sensory and motor neurons in neural pathways?

interneurons (association neurons)

What are the two major functional properties of neurons?

irritability and conductivity

What does not describe a reflex- involuntary, rapid, predictable, multidirectional

multidirectional

Support cells in the central nervous system are collectively called ________.

neuroglia

What is the correct sequence in a typical reflex arc?

receptor, sensory neuron, integration center, motor neuron, effector

What are the two main functional subdivisions of the nervous system?

sensory and motor

The gap between two communicating neurons is termed ________.

synaptic cleft

Myelinated fibers (tracts) form ________ matter while unmyelinated fibers form ________ matter.

white, gray

True or false: A sensory neuron carries stimuli from the central nervous system to the effector.

False

True or false: Oligodendrocytes form the myelin sheath around nerve fibers in the PNS.

False

True or false: The central nervous system includes the spinal nerves and cranial nerves.

False

The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________.

Nodes of Ranvier

What cells form the myelin sheaths around nerve fibers in the PNS?

Schwann cells

True or false: Gray matter contains collections of unmyelinated fibers and cell bodies in the central nervous system.

True

True or false: Neuron processes that convey incoming messages toward the cell body are dendrites, whereas those that generate nerve impulses and typically conduct them away from the cell body are axons.

True