Nervous System

Question 1

The nervous system enables us to

Answer 1

Perceive many of the changes that take place in our external and internal environment and to respond to those changes (seeing, hearing, tasting, smelling, touching)
Think, reason, remember, carry out activities.

Question 2

All actions of the nervous system depend on..

Answer 2

The transmission of nerve impulses over neurons or nerve cells

Question 3

What are the main parts of a neuron?

Answer 3

Cell body, axon (transmit the impulse away from the cell body), dendrites (transmit the impulse toward the cell body)

Question 4

What are the two divisions of the nervous system?

Answer 4

Central nervous system CNS

Peripheral nervous system PNS

Question 5

PNS

Answer 5

Consists of all the nerves that transmit information to and from the CNS

Question 6

Afferent

Answer 6

Sensory neurons transmit nerve impulses toward the CNS

Question 7

Efferent

Answer 7

Motor neurons transmit nerve impulses away from the CNS toward the effector organs such as muscles glands and digestive organs.

Question 8

What are the major parts of the brain?

Answer 8

Cerebrum – associated with movement and sensory input
Cerebellum – responsible for muscular coordination
Medulla oblongata – controls many vital functions such as respiration and heart rate

Question 9

How long is the spinal cord?

Answer 9

18 inches, extends from the base of the skull to the first or second lumbar vertebra.

Question 10

Simple (spinal) reflexes

Answer 10

Those in which nerve impulses travel through the spinal cord only and do not reach the brain

Question 11

The nervous system consists of…

Answer 11

The brain, spinal cord, and nerves