Introduction to Nervous Tissue

Question 1

what is the function of nervous tissue?

Answer 1

carries information throughout the body via electrical impulses

Question 2

what forms the CNS

Answer 2

brain and spinal cord

Question 3

what forms the PNS

Answer 3

cranial nerves and spinal nerves

Question 4

what is the function of the nervous system

Answer 4

provide rapid and precise communication between different parts of the body via the action of neurons

Question 5

where do nerve cells come from?

Answer 5

neurons

Question 6

where do support cells come from?

Answer 6

glial cells

Question 7

what do nerve cells do?

Answer 7

send signals around the body

Question 8

what do glial cells do?

Answer 8

protect, provide nutrients and immune functions to the neurons

Question 9

what is a neuron specialised for?

Answer 9

intercellular communication

Question 10

what is the structure of the neurons

Answer 10

dendrites, large cell body, single axon, terminal boutons

Question 11

comment on dendrites

Answer 11

highly branched processes extending from cell body. form synapses with adjacent neurons. respond to external stimuli. convey incoming information to cell body

Question 12

comment on the cell body

Answer 12

contains usual cellular organelles - large nucleus, nissl bodies, numerous mitochondria, no centrioles

Question 13

comment on the axon

Answer 13

rapidly propagates signal from cell body towards axon terminals. specialised to conduct action potentials. PNS - myelinated or non-myelinated. CNS - myelinated

Question 14

what does the neuroglia do?

Answer 14

protect and support neurons

Question 15

are ependymal cells part of the CNS or PNS?

Answer 15

CNS

Question 16

are astrocytes part of the CNS or PNS?

Answer 16

CNS

Question 17

are microglia part of the CNS or PNS?

Answer 17

CNS

Question 18

are oligodendrocytes part of the CNS or PNS?

Answer 18

CNS

Question 19

are satellite cells part of the CNS or PNS?

Answer 19

PNS

Question 20

are schwann cells part of the CNS or PNS?

Answer 20

PNS

Question 21

what do ependymal cells do?

Answer 21

line fluid-filled cavities in brain (ventricles) and spinal canal

Question 22

what do astrocytes do?

Answer 22

form the blood brain barrier and regulate the chemical environment

Question 23

what do microglia do?

Answer 23

remove invading microbes and dead cells from CNS

Question 24

what do oligodendrocytes do?

Answer 24

form myelin sheaths around ll CNS axons and provide structural and metabolic support

Question 25

what do schwann cells do?

Answer 25

form myelin sheaths around PNS axons and provide structural and metabolic support

Question 26

what do satellite cells do?

Answer 26

provide structural and functional protection