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Transcript of Natural Science
- It gives appropiate orders for our body.
- It controls and coordinates all organs and systems.
NS is made up of:
- Central nervous system.
- Peripheral nervous system.
The nervous system
Unit 1: The nervous system (part 2)
- Nervous tissue consists of neurons.
- They grouped to form nerves.
- 3 parts:
a. Body (widest part).
b. Dendrites. Receives messages from sense organs.
c. Axon. It transmits messages to other neurons.
a. Brain (protected by cranium and has 3 parts):
- Cerebrum (controls voluntary actions, stores data and memories, processes thoughts and control emotions.
- Cerebellum (controls movement, coordination and balance).
- Brainstem (controls internal organ activities: heart rate, breathing)
b. Spinal cord: long, thin bundle of nervous tissue (protected by spinal column); it produces involuntary responses.
The central nervous system
- Nerves extend throughout the body.
- It connects the Central nervous system to our sense organs, muscles and internal organs.
- Two types:
a. Sensory: messages in sense organs and send them to CNS.
b. Motor: orders from CNS to other organs.
The peripheral nervous system
- Voluntary movements.
- Reflex movements.
- Action we perform consciously (aware, start-stop).
- 3 main steps:
a. Sense organs capture stimulus and through sensory nerves goes to the cerebrum.
b. Cerebrum interprets and sends orders.
c. Muscles carry out the order performing movement.
- 2 types:
1. Gross motor skills (large movements).
2. Fine motor skills (precise movements).
- Rapid, automatic responses to stimuli.
- Movements to protect us from being hurt in dangerous situations.
- It is produced by the spinal cord.
- Three steps:
a. Sense organ captures a stimulus harmful or dangerous.
b. The spinal cord receives the message and gives the order..
c. Muscles perform the movement.