Nervous Tissue

Question 1

structural and functional divisions of nervous system

Answer 1

sensory (PNS) -> CNS -> Motor (PNS)

Question 2

motor system

Answer 2

autonomic (involuntary) ; sympathetic and parasympathetic , cardiac and smooth muscle
somatic (voluntary) ; skeletal muscle

Question 3

CNS support cells

Answer 3

ependymal cells, astrocytes, microglia, oligodendrocytes

Question 4

ependymal cells

Answer 4

cube shaped cells which line the cavities of the brain and spinal cord - play an important role in blood brain barrier

Question 5

astrocytes

Answer 5

star shaped cells that brace and support neurons

Question 6

microglia

Answer 6

spider-like phagocytes that dispose of debris

Question 7

oligodendrocytes

Answer 7

produce myelin sheath around nerve fibres in CNS

Question 8

PNS support cells

Answer 8

satellite cells, schwann cells

Question 9

satellite cells

Answer 9

protect neutron bodies in the PNS

Question 10

schwann cells

Answer 10

form myelin sheaths in PNS

Question 11

astrocytes in CNS

satellite cells in PNS

Answer 11

controls the extracellular fluid environment around neuron cell bodies

Question 12

oligodendrocytes in CNS

Schwann cells in PNS

Answer 12

neuroglia which form insulating coverings called myelin sheaths

Question 13

difference between a nerve and a tract

Answer 13

nerve is bunch of axons in PNS

tract is bunch of axons in CNS

Question 14

difference between ganglion and nucleus

Answer 14

ganglion is a group of neuron cell bodies in the PNS

nucelus is a group of neuron cell bodies in the CNS

Question 15

importance of myelin sheath

Answer 15

provides protection and insulation to the neuron and prevent leakage of electrical impulse down the axon

Question 16

which part of the neuron is its fibre

Answer 16

the axon which extends away from the cell body

Question 17

how do axons differ from muscle fibres

Answer 17

axons can send electrical impulse

muscle fibres can contract

Question 18

difference between nucleus in the brain and nucleus within a neuron

Answer 18

brain refers to a group of cell bodies

neuron refers to the organelle which house DNA

Question 19

first and last fibre to activate if you burn your finger

Answer 19

sensory first, motor last

Question 20

neuroglia vs neuron

Answer 20

neuron sends electrical impulse down the axon, neuroglia support the neuron , 10x more neuroglia , neurons do not divide where neuroglia can - neuroglia can be carcenogenic

Question 21

unipolar neurons

Answer 21

generally signal meurons

Question 22

multipolar neurons

Answer 22

generally interneurons and motor neurons

Question 23

myelination in CNS vs PNS

Answer 23

a single oligodendrocyte can wrap up multiple axons

one Schwann cell can only wrap up one axon