Topic 2 Lesson 5 Controlling Processes

Topic 2 Lesson 5 Controlling Processes

Nervous System

• the human nervous system is made up of organs and tissues like any system

• a cell that carries information thorugh nervous system is called a neuron

• neurons are made up of dendrites and axons

Nervous system

• divided up into two systems

• Central nervous system and the peripheral system.

• 
  

Central Nervous system

• made up of brain and spinal cord

• job of CNS is to control most of the functions of the body and mind.

Peripheral nervous system

• network of nerves that branches out from teh Central nervous system and connects to the rest of the body.

• 
  

Neurons-made up of three kinds of neurons

• sensory neurons-picks up a stimulus from the internal or external environment and converts the stimulus into a message

• Interneuron carries the message from one neuron to another

• motor neuron sends the message to a muscle or gland, which reacts accordingly

Function of a neuron

• function is to transmit information

• the message carried by the neuron is called a nerve impulse

Synapse

• the junction where one neuron can transfer an impulse to another neuron

• at the axon tips, electrical signals change to chemical signals.

Parts of the nervous system

• Central nervous system

• Peripheral Nervous system

Central Nervous system

• Brain (located in the skull)

• spinal cord (thick column of nervous tissue that links the brain to most of the nerves that branch out through the body

Peripheral Nervous system

• Somatic: controls voluntary actions (texting, throwing, etc. )

• Autonomic : involuntary actions (digestion, pupil dilation, etc)

Reflexes

• Involuntary reactions of jumping is a reflex

• Automatic response that occurs without conscience control.

• Pain can trigger a reflex arc

Endocrine System

• endocrine system, along with the nervous system helps the body maintain homeostasis.

• Nervous systems sends nerve impulses through the body

• endocrine system regulates the body by releasing chemicals called hormones.

Hypothalamus

• links the nervous system and the endocrine system.

• gland located deep inside the brain, just above the spinal cord.

• function is to send out nerve and chemical signals.

• 
  

• 
  

•