Controlling Homeostasis (1) “The Nervous System” … · Nervous System 2 divisions of the...
Transcript of 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”
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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?
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(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
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(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
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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
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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