Chapter 11 - Cells Of The nervous System Flashcards
What are the 3 main types of neurons, and what do they do?
Sensory neurons: gather information from sensory receptors and transmit these impulses to the CNS
Interneurons: are found only in the CNS, they act as a link between sensory and motor neurons
Motor neurons: conduct impulses from the interneurons to the effectors (muscles or glands)
What are glial cells ? What is it’s use in the NS
Glial cells account for about half of the volume of the nervous system. Glial cells nourish the neurons , remove their waste, and defend against infection
Where are dendrites located? And what is their function ?
Dendrites are short, branching terminals at the end of a Neuron .
They receive nerve impulses from other neurons or sensory receptors and relay the impulse to the cell body
What is the function of the cell body in a Neuron ?
The cell body contains the nucleus is the site of the cells metabolic reactions the cell body Also also processes input from the dendrites
What is an axon and where is it located in a neuron?
A Neuron typically has one axon
. Its that long skinny stringy thing in a neuron.
Axons conducts impulses away from the cell body also axons can either be Myelinated needed or unmyelinated
How is myelin sheath formed , and what is it’s purpose ?
Schwan cells a type of glial cell form Myelin by wrapping themselves around the Axon the Myelin sheath protects the neurons and speeds the rate of nerve impulse transmissions
