Unit #1: Wellness And HomeostasisControlling Homeostasis (1)

“The Nervous System”

How does the Body know what’s going on in another part of the Body?

How is Homeostasis Controlled?

How does the Body Maintain Homeostasis?

(A) The Central Nervous System

(“CNS”)

• Made up of the Brain (C) and the

Spinal Cord (D)

• The tissues of these organs receive

and interpret stimuli and then send

impulses to muscles and glands (co-

ordinates a response)

• Higher Mental Functions occur in

the Brain

• Automatic REFLEX actions occur

in the spinal cord

(B) The Peripheral Nervous System

2 divisions of the Peripheral Nervous System

• Made up of all other nerves associated

with the Brain and Spinal cord

• Allows the brain and spinal cord to

connect with the rest of the body

1. Sensory Division

• Transmits impulses from organs and

from body surfaces to the CNS

2 types of Sensory Nerves:

(E1) Visceral Sensory Nerves

– Conduct impulses from organs

(E2) Somatic Sensory Nerves

– Conduct impulses from body surfaces

2. Motor Division

• Transmit impulses from the CNS to

the body (“control nerves”)

(F1) Somatic Motor Nerves

• Carry impulses to skeletal muscle

• Autonomic Nerves carry impulses to

the Cardiovascular System

(F2) Sympathetic Nerves

(F3) Parasympathetic Nerves