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Homeostasis

Homeostasis. maintaining a constant internal temp. despite changes in external environment. Regulatory Systems:. Nervous System brain, spinal cord, nerve bundles Endocrine System endocrine organs, hormones, target organs. Feedback Systems. Negative Feedback System:

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Homeostasis

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  1. Homeostasis maintaining a constant internal temp. despite changes in external environment

  2. Regulatory Systems: • Nervous System • brain, spinal cord, nerve bundles • Endocrine System • endocrine organs, hormones, target organs

  3. Feedback Systems Negative Feedback System: • change detected, system(s) work to recover homeostasis • common in body • ex. thermostat in house

  4. Positive Feedback System • Very rare in living organisms • change detected, system(s) further amplify or speed up change • ex. oxytocin during birth

  5. 1. Structure & Function of the Nervous System 2 Major Parts to NS • CNS (central nervous system): • brain & spinal cord • PNS (peripheral nervous system) • nerves to and from CNS

  6. PNS made of 2 parts: • Sensory Division (Afferent) • impulses from receptors to CNS • Informs CNS of the state of the body (interior and exterior) • Sensory nerve fibers can be somatic(from skin, skeletal muscles or joints) or visceral (from organs w/in body)

  7. 2. Motor Division (Efferent) • Conducts impulses from CNS to effectors (muscles/glands) • motor nerve fibres

  8. Division of Motor NS • Motor NS further divided into 2 parts: • Somatic NS(usually voluntary) • sensory nerves that carry impulses from body’s sense organs to CNS • motor nerves that carry commands from CNS to muscles/glands

  9. 2. Autonomic NS (usually involuntary) • relays info to internal organs (no conscious control)

  10. includes 2 antagonistic systems always trying to balance each other • sympathetic NS – fight/flight (controls organs under high stress situations) • parasympathetic NS – rest/digest (controls organs at rest)

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