Introduction to Nervous System

Astrocytes (a neuroglial cell) functions to..

• makes cerebral spinal fluid

• eats bacteria and cell debris

• provides nutrients to neuron cells

• makes myelin

Myelin, an insulating material, is found in

• cell bodies

• dendrites

• axon terminals

• Schwann cells

The three types of neurons shown in the diagram are

• 1= interneuron

  2= motor neuron 3= sensory neuron

• 1= sensory neuron 2= motor neuron 3= interneuron

• 1= interneuron

  2= sensory neuron

  3= motor neuron

• 1= motor neuron

  2= sensory neuron

  3= interneuron

What does the central nervous system use to

determine the strength of a stimulus?

• Origin of the stimulus.

• Type of stimulus receptor.

• Frequency of action potentials.

• Size (amplitude) of action potentials.

What is the change of a cell membrane from positive to negative called?

• Glycolysis

• Action Potential

•  Temporal Summation

• Electrolysis

The critical point at which a stimulus causes an action potential

• Synapse

•  Action potential

• Membrane potential

• Threshold

In the CNS, glial cells out number neurons.

• True

• False

In resting potential, neurons have more _________ on the outside of the cell membrane.

• K+

• NaCl

• Na+

• Cl-

Action potentials run along the ______ from ______ to ________.

 

• axon

• myelin

• dendrites

• axon terminals

When a membrane potential reach +30mV, ________ channels open, ________ occurs, and ________ channels close.

 

• Sodium, depolarization, potassium

• Potassium, depolarization, sodium

• Sodium, repolarization, potassium

• Potassium, repolarization, sodium