Nervous System Chapters 8 and 9.

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Presentation transcript:

Nervous System Chapters 8 and 9

Homeostasis Review Variables: Set Point: Normal Range: Sensor: Regulatory Center: Effector:

System Functions Sensory Input: Sensory receptors within the skin and internal organs respond to internal and external stimuli by generating nerve impulses that travel to the brain and spinal cord. Integration: The brain and spinal cord sum up the impulses received from all over the body and send out nerve impulses. Motor Output: The impulses from the brain and spinal cord go to the effectors, which are muscles and glands.

Organization

Nervous Tissue All nervous tissue is composed of only two types of cells: ________________ and ____________________________. Neurons vary in appearance, but all have 1) cell body, 2) dendrite, and 3) axon. Neurolemmocyte (Schwann cell): specialized neuroglial cell of the PNS that creates myelin.

Types of Neurons Motor: impulses from CNS to muscles or glands (mostly multipolar). Sensory: impulses from sensory receptors to the CNS (many are unipolar). Interneurons: impulses conducted within the CNS (often multipolar).