controlling homeostasis (1) “the nervous system” … · nervous system 2 divisions of the...
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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
SYMPATHETIC NERVES:
- Deal with “FIGHT” or “FLIGHT”
actions
- Amplify Metabolism and Action
Processes
- Increased heart rate
- Increased breathing
- Increased Metabolism (while slowing
digestion)
- Increase in Insulin (which increases
glucose use)
PARASYMPATHETIC NERVES:
- Deal with RECOVERY actions
- Increases Digestion and Storage
- Increases LIVER and KIDNEY activity
- Slows heart rate
- Slows breathing