Nervous Tissue

Question 1

What are the 2 type of cells in nervous every tissue?

Answer 1

Neurons & neuroglia

Question 2

Neurons

Contain? Functions?

Answer 2

Excitable (respond to stimuli)
Transmit electrical signals
Contain organelles
-ER, mitochondria, nucleus in cell body

Question 3

Neuroglia

Location? Functions? Consists of?

Answer 3

Small cells SURROUND neurons
25x more in # than neurons
Support & other functions

Question 4

Neurons, what do they do? Length?

Answer 4

Convert stimuli into ACTION POTENTIALS
-electrical signal travels along neuron membrane
-travel @ .5 to 130 meters/seconds or up to 290 mph
1 mm to 1 m in length (longest in legs)

Question 5

What can’t neurons do?

Answer 5

Cannot under go mitosis

Question 6

Structure of neurons

Answer 6

Input region (dendrites) 
Integration region (cell body) 
Output region (axon)

Question 7

Myelination of axon

What’s myelin? What does it cover? What does it do?

Answer 7

Myelin
Most neurons covered by myelin (lipid & protein)
-insulates axon
-speeds up conduction of impulses

Question 8

How is myelin produced/made? Where are they Located? Function of them?

Answer 8

Produced by Schwann cells (PNS) & Oligodendrocytes (CNS)
Axons covered w/ Schwann cells
-protects myelin
-gaps btwn each Schwann cells- node of Ranvier

Question 9

Lost the Classification of neurons- function

Answer 9

Sensory (afferent) neurons
Motor (efferent) neurons
Interneurons

Question 10

Sensory (afferent) neurons

Polarity? Function? Location?

Answer 10

Connected to sense receptors or have receptors
Function: transmit impulses to CNS
-unipolar in SNS & ANS
-bipolar in special sense neurons

Question 11

Motor (efferent) neurons

Polarity? Function?

Answer 11

• multipolar neurons

- function: carry info from CNS to effectors

Question 12

Interneurons

Polarity? Function? Description?

Answer 12

Short distance
Function: contact w/ nearby neurons
-multipolar

Question 13

Relate classification of neurons- functions to touching a hot pan

Answer 13

Sensory (afferent) neurons - sense something hot
Motor (efferent) neurons - movement of pulling back, ( or like writing out words )
Interneurons - in spinal cord, tells to pull back from the hot object

Question 14

Nervous tissue is made of how many types of cells?

Answer 14

2 types

Question 15

most common glial cells in the CNS are

Answer 15

astrocytes

Question 16

myelin sheaths that surround the axons of the neurons in the CNS are formed by the glial cell

Answer 16

oligodendrocyte

Question 17

a functional neuron w/ a cell body located in the CNS whose primary function is connecting other neurons is called a(n) ______ neuron

Answer 17

interneuron

Question 18

the structural classification of a neuron w/ 1 axon and 1 dendrite that extends from opposite sides of the cell body is called a ____ neuron

Answer 18

bipolar

Question 19

what type of structural neuron is the most common type of neuron in the CNS

Answer 19

multipolar

Question 20

the neuron process that normally receives incoming stimuli are called

Answer 20

dendrites

Question 21

which type of neuroglia cell is involved removing damaged nerve tissue and invading microbes

Answer 21

microglia

Question 22

what is the function of myelin

Answer 22

insulates the axon (main function) and helps conduct impulses faster

Question 23

which type of structural neuron is the most rare & found in the retina of the eye?

Answer 23

bipolar

Question 24

motor (efferent) neurons are usually what type of structural neuron?

Answer 24

multipolar