Neurons and Types

Question 1

Neurons

Answer 1

Receive stimuli and transmit info

Question 2

Neuroglia cells

Answer 2

Support + protect neurons

Question 3

Basic organisation

Answer 3

1. Cell body (soma)
2. Dendrites: input
3. Axons: Output

Question 4

Types of neurons

Answer 4

1. Sensory/ afferent: nerve impulses TOWARD CNS
2. Motor/ efferent: Nerve impulses AWAY from CNS
3. Interneurons/connector: within CNS from one neuron to another

Question 5

Sensory Neurons

Answer 5

1. Long dendrites: Short Axons
2. Soma not in man line of transmission
3. Soma form ganglion near terminal

Question 6

Motor Neurons

Answer 6

1. Short dendrites: Long axons
2. Soma on main axis (line)
3. Terminals may be enlarged to form synaptic knob

Question 7

Connector Neurons

Answer 7

1. Soma central
2. Axons and Dendrites similar size
3. Many connections to other neurons

Question 8

Neuron Cell body

Answer 8

1. Round structure
2. Contains DNA + Directs metabolism
3. No role in neural signaling

Question 9

Dendrites

Answer 9

1. Information collectors
2. Impulses TOWARD cell body
3. Receive input from other neurons
4. Enough inputs= may generate output

Question 10

Axon

Answer 10

1. Carry impulse away from soma
2. 1 per cell

Question 11

Myelin sheath

Answer 11

1. White fatty casing on axons
2. Electrical insulator
3. Not on all cells
4. Increases neural signal speed if present

Question 12

Neurilemma

Answer 12

1. Membrane covering myelin sheath in PNS
2. Assists in neuron repair