Neurons

Question 1

Types of nerve tissues

Answer 1

• Neurons
• Neuroglia

Question 2

Neurons

Answer 2

• Working units of the nervous system that generate and transmit impulses
• A neuron is composed of a cell body from which protoplasma processes arise.

Question 3

types of processes

Answer 3

• Axon
• Dendrites

Question 4

Neuroglia

Answer 4

• Are the connective tissue cells of the central
  nervous system

Question 5

Axon

Answer 5

• Are long processes and only one axon arises from each nerve cell
• A nerve fibre that conveys nervous impulses away from cell body.

Question 6

What surrounds the axon

Answer 6

Myelin sheath

Question 7

sensory neurons

Answer 7

• Collects information from the environment and transmitting it to the brain for interpretation.

Question 7

Dendrites

Answer 7

*Are short processes and one or more arise from each nerve cell.
* Convey impulses towards the cell body

Question 8

what forms the white matter and grey matter

Answer 8

• axon and dendrites are extensions of the cell body and they form the white matter.
• Cell bodies form the grey matter of the nervous system

Question 9

types of neurons

Answer 9

1. Sensory neurons
2. Relay or interneurons
3. Motor neurons

Question 10

Motor neurons

Answer 10

• Take instructions from the Brain and the spinal cord and translate them into precise movement.

Question 11

relay neurons

Answer 11

• Neurons that ensure smooth communication between sensory and motor neurons.

Question 12

Classes of neurons

Answer 12

1. Multipolar neurons
2. Bipolar neurons
3. Pseudounipolar neurons
4. unipolar neurons

Question 13

Multipolar neurons.

Answer 13

• Have one axon and 2 or more dendrites (most motor neurons and connector neurons are of this type)

Question 13

Bipolar neurons

Answer 13

• Oval cells that have one dendrite and one axon
• Arise from opposite poles of the cell body

Question 13

Pseudounipolar neurons

Answer 13

Are spherical cells which possess a single process which divides to form one axon and one dendrite

Question 14

3 main types of neuroglia

Answer 14

1. Astrocytes
2. Oligodendrocytes
3. Microglial cells

Question 15

Astrocytes

Answer 15

• These are stellate cells possessing numerous
  processes

Question 16

Oligodendrocytes

Answer 16

• Are similar to astrocytes but possess
  fewer processes.

Question 17

Microglial cells

Answer 17

are small cells which have few processes.
* They resemble the cells of the reticuloendothelial system. Since they are capable of phagocytosis.