The Nervous System.

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Presentation transcript:

The Nervous System

Essential Question How does the nervous system promote homeostasis in the body.

Purpose The Purpose for all body systems is to promote homeostasis. Homeostasis = The tendency of an organism to regulate its internal conditions, so as to stabilize health and functioning.

What is the nervous system? Made up of your brain, your spinal cord, and an enormous network of nerves that thread throughout your body, it's the control center for your entire body.

Functions A. Gathers information both from the outside world and from inside the body. SENSORY FUNCTION B. Transmits the information to the processing area of the brain and spinal cord.

C. Processes the information to determine the best response C.  Processes the information to determine the best response.  INTEGRATIVE FUNCTION D.  Sends information to muscles, glands, and organs (effectors) so they can respond correctly.  Muscular contraction or glandular secretions.  MOTOR FUNCTION

The Nervous System has TWO Major Divisions. The Central Nervous System (CNS) consist of the Brain and the Spinal Cord. The Spinal Cord carries messages from the body to the Brain, where they are analyzed and interpreted.  Response Messages are then passed from the Brain through the Spinal Cord and to the rest of the Body.

Stimulus Response

B. The Peripheral Nervous System (PNS) consists of the neurons NOT Included in the Brain and Spinal Cord. 

THE NEURON 1. The CELLS that Carry Messages Throughout the Nervous System are called NEURONS. 2. The Neuron is the Basic Functional Unit of the Nervous System.

THE NEURON 3. Whatever their specific function, all neurons have the same physical parts: The Cell Body, Dendrites and One Axon. 4. Messages take the form of ELECTRICAL SIGNALS, and are known as IMPULSES.  A Neuron carries impulses in only ONE direction.

Dendrites Axon Terminal Cell body Nucleus

Phineas Gage

Coordination and control of voluntary movement Cerebellum Coordination and control of voluntary movement Brain Stem Breathing, digestion, heart control, blood vessel control, Alertness

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