Nervous system (8.3 cells of the nervous system)

What are the two types of cells that make up nervous system?

This type of cell in nervous system receive stimuli, conduct action potentials, and transmit signals to other neurons or effector organs

What are the 3 parts of neurons

Each neuron _______ contains a single nucleus. As with any other cell, the nucleus of the neuron is the source of information for

gene expression.

this part of neuron is short often highly branching cytoplasmic extensions

a single long cell process extending from the neuron cell body (part of neuron)

The area where the axon leaves the neuron cell body is called,

TRUE or FALSE
Axons of sensory neurons conduct action potentials toward the CNS and axons of motor neurons conduct away from CNS
True False

An axon may remain unbranched or may branch to form what?

What are the three types of neurons that are distinguished according to their structures?

This type of neuron have many dendrites and a single axon.

TRUE or FALSE
Most of the neurons within the CNS and nearly all motor
neurons are multipolar.
True False

This type of neuron has two processes: one dendrite and one axon.

This type of neuron has a single process extending from the cell body. This process divides into two processes a short distance from the cell body

These are the supportive cells of CNS and PNS and they do not conduct action potentials

What are the four different types of glial cells in CNS?

This serves as the major supporting cells in CNS

This supporting cell in CNS has a major role in blood-brain barrier

This supporting cell in CNS line the fluid-filled cavities such as ventricles and canals, in CNS

This supporting cell in CNS provides an insulating materials, surrounding axons

This supporting cell in CNS act as immune cells of the CNS. They help protect the brain by removing bacteria and cell debris

This supporting cell in PNS provide insulating material around axon

These are specialized layers that wrap around the axons of some neurons

What cells in CNS and PNS produce myeline sheaths respectively?

_____ is an excellent insulator that prevents almost all ion movement across the cell membrane.

What do we call the gaps in myelin sheaths? This occurs about every millimeter between the oligodendrocyte segments or between individual Schwann cells, in which ion movement can occur

What is the effect of myelination of an axon?

TRUE or FALSE

A typical big nerve, which consists of axons of multiple neurons, usually contains more unmyelinated axons than myelinated axons.
True False

TRUE or FALSE
The nervous tissue varies in color due to the location and arrangement of the parts of neurons and glial cells.
True False

This consists of groups of neuron cell bodies and their dendrites, where there is very little myelin.

What are the gray matter in CNS?

Gray matter in PNS in which it consists of a cluster of neuron cell bodies

consists of bundles of parallel axons with their myelin sheaths, which are whitish in color

What does the white matter in CNS and PNS form, respectively?