L11;C3

Question 1

What does the PNS comprise of?

Answer 1

Sensory divisions as well as motor divisions

Question 2

What are the five afferent receptors that go to the brain?

Answer 2

Mechanorectors 
Chemoreceptors 
Thermoreceptors 
Noiciprecptors 
Photoreceptors

Question 3

Slow adapting —> _____ and ______

fast adapting —> _____ and ______

Answer 3

Merkel, Ruffini

Meissner, pacinian

Question 4

Explain wha the following do:

Merkel
Meissner
Ruffini
Pacinian

Answer 4

Merkel—> provides info about pressure, position, touch and temp
Meissner—> sensitive to skin stretch
Ruffini—> light touch
Pacinian—> vibration and touch

Question 5

What are the three sensory receptors?

Answer 5

Joint kinaesthetic receptors—> responsible for movement, found inside the join

Muscle spindles—> senses when muscles stretch, aligned within muscles and sensitive to muscle length and rate of length change

Golgi tendons—> within muscle organs, sensitive to tension in tendon

Question 6

What are the two parts to the autonomic system? Describe them?

Answer 6

Sympathetic system—> Ach is pre ganglionic neurotransmitter while norepinephrine is post ganglionic neurotransmitter

Parasympathetic—> both Ach for pre and post

Question 7

True or false: somatic nerves synapse at ganglions.

Answer 7

False, they are directly on muscle and the neurotransmitter is Ach

Question 8

Wheat do gamma motor neurons do?

What do alpha motor neurons do?

Answer 8

Gamma—> stimulate intrafusal muscle fibre

Alpha—> stimulate extrafusal muscles

Question 9

What happens (efferent or afferently) when muscle spindles and Golgi tendons fire?

Answer 9

They afferently send info to spinal cord and CNS; they elicit an antagonist response in the muscle