Science Final Ch. 29

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What does the nervous system do?
- Controls and coordinates functions throught he body
- Responds to internal and external simuli
Impulses

electical signals
What type of cell transmits impulses?

nuerons
What are the three different types of neurons?

Sensory, motor, and internuerons
how are the three different neurons classified?

the direction in which an impulse travels
Sensory neurons

carry imulses from the sense organs to the spinal cord and brain
Motor neurons

carry impulses form the brain and apinal cord the muscles and glands
internuerons

connect sensory and motor neurons and carry impulses between them
what does the cell body contain?

the nucleus and much of the cytoplasm
axon

the long fiber that carries impulses away from the cell body(part of a neuron)
Where does teh axon end?

axon terminals
What is a myelin sheath?

helps the impulse travel faster by making gaps that make impulses go faster
When does an impulse begin?

when a neruon is stimulated by another neuron or by the environment
Synapse

loacation at which a neuron can transer an impulse to another cell
What separates thea xon terminal from the dendrites of the adjacent cell?

the synaptic cleft
Neurotransmitters

chemicals used by a neuron to transmit an impulse across a synapse to another cell
What are the two major divisions in the human nervous system?
- Central nervous system
- Peripheral nervous system
What does teh central nervous system do?
- Relays messages
- Processes information
- Analyzes information
What does the CNS consist of?

Brain and spinal cord
What is the spinal cord the main communcation between?

the brain and the rest of the body
What does the peripheral nervous system contain?

all of the nerves and associated cells that are not a part of the brain and the spinal cord
Wat does the sensory division fo the PNS do?

transmits impulses from the sense organs to the central nervous system
what does the motor divison of the PNS do?

transmits impulses from the CNS to the muscle glands
What is the motor division divided into?

Somatic nervous system and the autonomic nervous system
What does the autonomic nervouls system do?

regulates involuntary activities
What does the somatic nervous system do?

regulates activitites that are under conscious control
What does the cerebrum do?

It controls unvoluntary movement and the ability to learn and memory. It is the biggest part of the brain.
What does the cerebellum do?

It is the 2nd largest region of the brain and it controls movement and balance.
What does the medulla oblongata do?

It is responsible for blood pressure, breathing, and swallowing.
What does the Hypothalamus control?

It controls hunger, thirst, fatigue, anger, and body temperature.

Author

KattthD

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Card Set

Science Final Ch. 29

Description

Nervous System

Updated

2012-01-24T01:24:29Z