Nervous System

Question 1

Why do animals need a nervous system?

Answer 1

What characteristics do animals need in
a nervous system?

• fast
• accurate
• reset quickly

Question 2

NERVOUS CONTROL OF HOMEOSTASIS

Answer 2

• The human nervous system is divided into TWO parts

1. CENTRAL NERVOUS SYSTEM (CNS)
2. PERIPHERAL NERVOUS SYSTEM (PNS)

Question 3

Central nervous system (CNS)

Answer 3

Brain - receives and processes sensory information, initiates responses, stores, memories generates thoughts and emotions.

Spinal cord - Conducts signals from the brain control reflex activities

Question 4

PERIPHERAL NERVOUS SYSTEM

Answer 4

SOMATIC NERVOUS SYSTEM

Includes MOTOR NEURONS that are under conscious control and ALL of the SENSORY NEURONS in your body.

AUTONOMIC NERVOUS SYSTEM

Includes only the MOTOR NEURONS that function without conscious control.

We don’t consciously think about making our heart beat…

Question 5

Two types of nerves that make up the Autonomic Nervous System

Answer 5

SYMPATHETIC NERVES
Prepares the body for danger!

• Increase size of pupils
• Speed up heart rate
• Slow digestion
• Relax bladder muscles

PARASYMPATHETIC NERVES

Returns the body to a normal state after a stressful situation!

• Makes pupils of the eye smaller
• Slows down the heart rate
• Increases rate of digestion
• Contract bladder muscles