BSC2085C Lecture 12: Nervous system part 1 notes
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Nervous system (part 1)
The Nervous System
1. Master control center of the body
2. Cells communicate via electric and chemical signals
a. Usually cause immediate responses.
b. Rapid and Specific
Functions of the Nervous System
1. Sensory Input
a. Information gathered by sensory receptors about internal and external changes
b. Anything that monitors and detects a change.
c. Have them for internal and external environment
d. EX: Stomachache, hot outside
a. Processing and interpreting of sensory input
b. Where the input is headed.
c. Mainly the brain and spinal cord
3. Motor output
a. Activation of effector organs (Muscles and glands) produces a response.
b. EX: Makes the sweat glands sweat, tells the brain to throw up, etc.
Divisions of the Nervous System (ch.11)
1. Central Nervous System (CNS) (ch.12) *Will be on exam 3*
a. Brain and spinal cord
b. Interprets sensory input and dictates motor output
2. Peripheral Nervous System
a. Consists mainly of nerves that extend from the spinal cord
i. Spinal Nerves: to and from the spinal cord
ii. Cranial Nerves: To and from the brain
Peripheral Nervous System
1. Sensory Division
a. Information coming into the integration center
2. Motor Division
a. Transmits impulses from CNS to effector Organs
b. Two Divisions
i. Somatic Nervous System (Skeletal muscle, Voluntary)
1. Conducts impulses from the CNS to skeletal muscle
ii. Autonomic Nervous System (Involuntary) (Ch.14)
2. Sympathetic Fight or flight responses
Histology of the Nervous System
1. Less than 20% of the Nervous system is space. Highly cellular at 80%
2. Two principle cell types
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