Nervous System & Endocrine System

Nervous System: Sending messages fast but they don’t last long

Endocrine System: Sending messages slowly but they last a long time

•Types of Neurons

•Parts of the Nervous System

•Glands & Hormones of the Endocrine System

Endocrine SystemUses hormones that travel through the bloodstream. Takes

longer to get there but lasts a long time

3 types Neurons

Types of Neurons

Sensory Motor Interneurons

SpinalCord

BrainSensoryNeuron

Sensory Neurons• INPUT From sensory organs to the brain and spinal

cord

Drawing shows a somatic neuron

SpinalCord

BrainSensoryNeuron

MotorNeuron

Motor Neurons

• OUTPUT From the brain and spinal cord, to the muscles and glands

SpinalCord

BrainSensoryNeuron

MotorNeuron

Interneurons

• Interneurons carry information between other neurons only found in the brain and spinal cord

The ReflexWorks by bypassing the brain so you can react quicker.

Sensory Neuron Interneuron Motor Neuron

A Neural Chain

A Neural Chain

A Neural Chain

A Neural Chain

A Neural Chain

A Neural Chain

The Nervous System:Sends messages quickly but they don’t last long.

Broken into two parts:

• Central Nervous System (CNS)– Brain and spinal cord

• Peripheral Nervous System (PNS)– Carries messages to and from CNS

Central nervous system

Peripheral nervous system

The Nervous System: It breaks down into two parts.

Sympathetic and parasympathetic divisions of the nervous system

Summary of autonomic differences

Autonomic nervous system controls physiological arousal

Sympatheticdivision (arousing)

Parasympatheticdivision (calming)

Pupils dilate EYES Pupils contract

Decreases SALIVATION Increases

Perspires SKIN Dries

Increases RESPERATION Decreases

Accelerates HEART Slows

Inhibits DIGESTION Activates

Secrete stresshormones

ADRENALGLANDS

Decrease secretionof stress hormones