HBT Nervous tissue

Question 1

What are the functions of nervous tissue?

Answer 1

• Integration and control of bodily functions- homeostatic regulation
• Cognitive processes
• Sensory input, motor output

Question 2

Describe the structure of nervous tissue

Answer 2

• Cell body, axon, dendrites- conductivity

- Support cells do not conduct impulses- only to support and protect

Question 3

What are the cell processes in nervous tissue?

Answer 3

• Dendrites- large central nucleus with nucleolus

- Axon- various length, impulses away from body

Question 4

What are the three different shapes of neurons?

Answer 4

• Multipolar
• Bipolar
• Pseudounipolar

Question 5

Describe the multipolar shape of a neuron

Answer 5

One axon, multiple dendrites

Question 6

Describe the bipolar shape of a neuron

Answer 6

One axon and one dendrite

Question 7

Describe the psuedounipolar shape of a neuron

Answer 7

One short process that bifurcates into axon and dendrite

Question 8

What are the support cells found in the PNS?

Answer 8

Satellite cells and Schwann cells

Question 9

Describe satellite cells

Answer 9

Found only in the ganglia, cover neuronal perikaryal surface

Question 10

Describe Schwann cells

Answer 10

Envelop axons, support neurons

Question 11

What support cells are found in the CNS?

Answer 11

Neuroglia

Question 12

Give examples of neuroglia

Answer 12

Astrocytes, oligo dendrocytes, microglial cell and ependymal cell

Question 13

What do astrocytes do?

Answer 13

Regulate transmission of electrical impulses to the brain- enter blood-brain barrier (star-shaped)

Question 14

What do oligodendrocytes do?

Answer 14

Only support myelinated- insulation- similar to Schwann cells (attached to myelinated)

Question 15

What do microglial cells do?

Answer 15

Mediate immune system- phagocytosis- with elongated nuclei

Question 16

What do ependymal cells do?

Answer 16

For CSF, line ventricular system of brain, simple cuboidal