NervouNervous s

SystemSystem

Nervous SystemNervous System

•How did our nervous system How did our nervous system work in the Impulse Activity we work in the Impulse Activity we just completed?just completed?– We sensed the touch.We sensed the touch.– A message was sent to our brain.A message was sent to our brain.– Our brain sent a message to our Our brain sent a message to our

muscles.muscles.– Our muscles squeezed the hand.Our muscles squeezed the hand.

Organs of the Nervous Organs of the Nervous SystemSystem

BrainBrain= uses information it receives = uses information it receives from nerve impulses to coordinate actionsfrom nerve impulses to coordinate actions

Organs of the Nervous Organs of the Nervous SystemSystem

NervesNerves= carry messages= carry messagesthroughout thethroughout thebodybody

Organs of the Nervous Organs of the Nervous SystemSystem

Spinal CordSpinal Cord= = Central communication Central communication system. system.

–Nerve centerNerve center

–Messages are sent to Messages are sent to the brain through the the brain through the spinal cord.spinal cord.

–Exception: Reflexes Exception: Reflexes skip the spinal cord and skip the spinal cord and go straight to the brain.go straight to the brain.

Functions of the Nervous Functions of the Nervous SystemSystem

Functions include:Functions include:– Control centerControl center– Communication Communication

networknetwork– Coordinates all Coordinates all

actions and actions and reactionsreactions

– Send messages as Send messages as electrical impulseselectrical impulses

Functions of the Nervous Functions of the Nervous SystemSystem

Functions include:Functions include:– Allows us to Allows us to

•ThinkThink

•EvaluateEvaluate

•RememberRemember

Functions of the Nervous Functions of the Nervous SystemSystem

Functions include:Functions include:1.1.Sensory Input- Sensory Input- Senses send messages Senses send messages to the brain.to the brain.

2.2.Integration- The brain Integration- The brain interprets and interprets and translates.translates.

3.3.Motor Output- The Motor Output- The brain sends messages brain sends messages to body.to body.

Functions of the Nervous Functions of the Nervous SystemSystem

Functions include:Functions include:

– – Central Nervous System- MaintainsMaintains

homeostasis byhomeostasis by

regulating vital bodyregulating vital body

functions such as functions such as

breathing, heart rate, breathing, heart rate,

hormones, etc.hormones, etc.

Functions of the Nervous Functions of the Nervous SystemSystem

Functions include:Functions include:– Peripheral Nervous System- •Sensory Neurons- Carry Sensory Neurons- Carry information toward the information toward the central nervous systemcentral nervous system

•Motor Neurons- Send Motor Neurons- Send impulses away from the impulses away from the central nervous systemcentral nervous system