MA - Nervous System III

Question 1

What are the 2 subdivisions of the Nervous System?

Answer 1

1. CNS
2. PNS

Question 2

What is the difference between afferent and efferent?

Answer 2

Afferent- Carrying information into the CNS (Sensory)

Efferent- Carrying information away from the CNS (Motor)

Question 3

What is the difference between somatic and visceral?

Answer 3

Somatic- (Body) Muscles, skin, bones, joints

Visceral- (Internal) Heart, lungs, digestice system, kidneys, reproductive system

Question 4

What 3 things does the ANS control?

Answer 4

1. Circulation of blood
2. The activity of the gastrointestinal tract
3. Body temperature

Question 5

What 6 things does the sympathetic system do?

Answer 5

1) Increases arterial blood pressure, heart rate and force of contraction

2) Inhibition of pancreatic enzyme secretion

3) Inhibition of pancreatic insulin secretion

4) Dilation of iris (eye)

5) Decreased gut motility and secretion

6) Ejaculation in men

Question 6

Where do sensory, motor and autonomic nerves all meet?

Answer 6

In the spinal nerve

Question 7

What are myotomes and dermatomes?

Answer 7

Myotome is defined as a group of muscles which is innervated by single spinal nerve root.

Dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root

Question 8

What is a motor unit?

Answer 8

A motor neuron and all the skeletal muscle fibres it innervates (these contract together)