Nervous tissue

Question 1

What are neurons?

Answer 1

Special cells that form a continuous network, extending all over the body.

Neurons make up the nervous system

Question 2

Why do neurons need a continuous supply of oxygen and glucose?

Answer 2

Neurons have a very high metabolic rate and will not survive without oxygen.

Question 3

What are glial cells?

Answer 3

Supporting cells

Question 4

What is the function of glial cells?

Answer 4

Make myelin and support and protect neurons

Question 5

What is the structure of a neuron?

Answer 5

Have a cell body and neuron fibres

Question 6

What is the function of Neuron fibres?

Answer 6

Allow for nerve impulses to be carried long distances.

Question 7

What does the fibres in the neurons consist of?

Answer 7

Dendrites and neurons

Question 8

What are Dendrites?

Answer 8

Short, tapering processes that branch out to provide a large surface area to receive signals from other neurons

Question 9

What is the function of Dendrites?

Answer 9

Conduct impulses TOWARDS the cell body.

Question 10

What is an axon?

Answer 10

Branch off at its end to form terminal branches

Question 11

What is the function of an axon?

Answer 11

Conducts impulses AWAY FROM the cell body.

Question 12

What are the different type of Neurons?

Answer 12

Sensory/unipolar Neurons,
Connector Neurons,
Motor/multipolar neurons

Question 13

What are sensory/unipolar neurons?

Answer 13

One fibre is attached to cell body

Question 14

Why are sensory neurons referred as afferent neurons?

Answer 14

Carry impulses from receptors TOWARDS the CNS where sensation interpreted.

Question 15

What are connector neurons?

Answer 15

They are multipolar neurons found in CNS, make up 99% of neurons

Question 16

What are multipolar neurons?

Answer 16

Many fibres are attached to cell body

Question 17

What is the function of the connector neurons?

Answer 17

Receive impulses from sensory neurons and pass them on to other neurons?

Question 18

What a some of the other names given to Connector neurons?

Answer 18

Relay neurons,
Association neurons,
Interneurons

Question 19

Why are Motor Neurons are referred as efferent neurons?

Answer 19

Carry impulses AWAY FROM the CNS to effectors, for appropriate response can be brought.

Question 20

What does Nervous Tissue consist of?

Answer 20

Neurons and neuroglia

Question 21

What is the structure of a of a motor neuron?

Answer 21

Dendrites
Cell body: Nissel Body, cell membrane, nucleus, cytoplasm, neuroplasm
Node of ranvier
Schwann
Axon
Myelin Sheath
Terminal branches
Synaptic knob

Question 22

What is the function of a cell body?

Answer 22

Controls the metabolism of the cell

Question 23

What is the function of node of Ranvier?

Answer 23

Allows rapid conduction of impulses by allowing them to jump from one node to the next

Question 24

What is the function of Schwaan cells

Answer 24

Secretes the myelin sheath when wrapped around axon

Question 25

What is the function of the myelin sheath

Answer 25

Forms an electrical insulation to prevent impulses from being disrupted from activity

Question 26

What is the function of terminal branches?

Answer 26

Carry impulses to synaptic knob

Question 27

What is the function of a synaptic knob?

Answer 27

Forms a synapse with another neuron , a muscle or a gland cell