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Summary Nervous System
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Revision notes on the nervous system. A level biology OCR A revision notes. Notes on module 5: Communication, homeostasis and energy. Summary/ information you need to memorize for a level biology OCR A exams. A* student's revision notes.

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  • December 4, 2023
  • 3
  • 2022/2023
  • Summary

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Nervous System:
 Mammals use both the endocrine and nervous systems to
monitor changes in their internal and external environments
and to respond to them.
 The nervous system organisation:

THE NERVOUS SYSTEM

Motor, Relay and Sensory
Neurones.

Glial Cells (e.g. Schwann cells).




CENTRAL NERVOUS SYSTEM PERIPHERAL NERVOUS
(CNS): SYSTEM (PNS):
Coordination, Relay Neurones, Sensory Neurones – Receptors
White Matter (Myelinated) to CNS.
and Grey Matter (Non-
Motor Neurones – CNS to
myelinated).
effector.




BRAIN: SPINAL CORD: AUTONOMIC NERVOUS SOMATIC NERVOUS
Cerebrum, Corpus SYSTEM: SYSTEM:
Collosum, Medulla
Involuntary, controls Voluntary, controls
Oblangata, Hypothalamus.
homeostatic mechanisms, conscious activities, and
and stimulates cardiac and stimulates skeletal
smooth muscle.



SYMPATHETIC: PARASYMPATHETIC:




Antagonistic relationship.

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