Chapter 2 2.1

Question 1

The Nervous System

Answer 1

Neurons are the cells. The NS complex set of cells whose function is to allow an organism to gain information about what is going on inside and outside the body and to respond appropriately.

Question 2

Dendrites

Answer 2

Neuron fibers receive signals from the atoms of other neurons and carry those signals to the cell body.

Question 3

Cell body

Answer 3

DNA & mitochondira O2, glucose, and energy

Question 4

Action Potential

Answer 4

An abrupt wave of electrochemical changes traveling down an axon when a neuron becomes depolarized.

Question 5

Refractory Period

Answer 5

A short rest period between action potentials.

Question 6

Axons

Answer 6

Fibers that carry signals from the body of a neuron out to where communication occurs with other neurons.

Question 7

Myelin Sheath

Answer 7

An insulating layer, or sheath, forms around nerves in the brain and spinal cord.

Question 8

Glial cells - Schwann cells & astrocytes

Answer 8

Cell in the nervous system hold neurons and helps them communicate with one another.

Question 9

Terminal Boutons - nodes of Ranvier

Answer 9

The terminal inflated portion of the axon contains the specialized apparatus necessary to release neurotransmitters.

Question 10

Synapse - Synaptic cleft

Answer 10

The tiny gaps between neurons across which they communicate.

Question 11

Neurotransmitters

Answer 11

Chemicals that assist in the transfer of signals from one neuron to another.