Mod3-Obj2: Divisions of the NS

Question 1

The nervous system has to anatomical divisions

Answer 1

1. ) Central nervous system (CNS)

2. ) Peripheral nervous system (PNS)

Question 2

CNS

Answer 2

Consists of the brain and spinal cord

Question 3

The CNS…

Answer 3

• Integration and command centre
  1. ) Interprets, process and stores sensory input
  2. ) Issues motor output
• Control our emotions, behaviours and personality
• Performs intellectual function
• Stores memories

Question 4

PNS

Answer 4

Consists of sensory receptors and peripheral nerves (cranial nerves and spinal nerves) that link all parts of the body to the CNS

Question 5

The PNS has two functional divisions

Answer 5

1. ) Sensory division

2. ) Motor division

Question 6

PNS: Sensory division

Answer 6

Conveys sensory input from receptors to the CNS

Question 7

PNS: Somatic sensory

Answer 7

Input originates from the skin, skeletal muscles and joints

Question 8

PNS: Visceral sensory

Answer 8

Input originates from the visceral (abdominopelvic) organs

Question 9

PNS: Special sensory

Answer 9

Input originates from eyes, ears, mouth and nose

Question 10

PNS: Motor division

Answer 10

Conveys motor output from the CNS to an effector gland or muscle (skeletal, cardiac or smooth)

Question 11

The Motor division of the PNS is divided into 2 subsystems

Answer 11

1. ) Somatic nervous system

2. ) Autonomic nervous system

Question 12

PNS, MOTOR DIVISION: Somatic nervous system

Answer 12

Conveys motor output to skeletal muscles only

Question 13

PNS, MOTOR DIVISION: Somatic output produces:

Answer 13

1. ) Voluntary muscle movements

2. Involuntary skeletal muscle movements=somatic reflexes

Question 14

PNS, MOTOR DIVISION: Autonomic nervous system

Answer 14

Conveys motor output to cardiac muscle, smooth muscle and glands

Question 15

PNS, MOTOR DIVISION: Autonomic output control involuntary responses such as

Answer 15

• Heart rate (cardiac muscles)
• Digestion (smooth muscle & glands)
• Urination
• Perspiration (sweat glands)

Question 16

The Autonomic nervous system has 2 functional division

Answer 16

1. ) Sympathetic division

2. ) Parasympathetic division

Question 17

ANS, SYMPATHETIC DIV

Answer 17

Controls fight and flight activities

i.e) body functions that support physical activity

Question 18

Examples of the sympathetic division of the ANS

Answer 18

• Increases heart rate, respiratory airflow & blood flow to skeletal muscles
• Increases sweat gland activity
• Dilates pupils
• Inhibits digestive function
• Inhibits urination & defecation

Question 19

ANS, PARASYMPATHETIC DIV

Answer 19

Controls rest and digest activities

i.e.) Conserves energy and promotes the body’s house keeping functions

Question 20

Examples of the parasympathetic division of the ANS

Answer 20

• Stimulates digestive functions, urination & defecation
• Decreases heart rate
• Decreases respiratory rate
• Constricts the pupil

Question 21

NS divisions

Answer 21

NS-CNS+PNS
CNS-Brain+Spinal cord
PNS-Sensory+Motor
Motor div-Autonomic+Somatic
Autonomic-Sympathetic+Parasympathetic