1. Control of our body..

2. Two ways our body control itself:
1.Chemical
2.Electrical

3. The Endocrine System Chemical Communication Main Function:
It releases hormones into the blood to signal other cells to behave in certain ways. It is a slow but widespread form of communication. It also has a long lasting effect.
Chemical
Communication

4. The Endocrine System Consists of:
Endocrine glands Release hormones into the bloodstream.
Hormones are chemicals released in one part of the body that travel through the bloodstream and affect the activities of cells in other parts of the body.

5. The Nervous System
Electrical
Communication

6. The Nervous System Main Function:
This communication system controls and coordinates functions throughout the body and responds to internal and external stimuli. It is quick, but only influence direct areas.
Our survival depends on us being sensitive to our surroundings. We need to be able to detect any changes and be able to respond to them.
Our nervous system allows us to feel pain.

7. In a whole consists of: brain, spinal cord, nerves and sense organs
The Nervous System
In a whole consists of: brain, spinal cord, nerves and sense organs
Sense Organs: Eyes, Skin, Ears, Nose & Tongue

8. Central Nervous System
Consists of: Brain and Spinal Cord
brain
Spinal Cord
Cerebellum
Cerebrum
Medulla Oblongata

9. Cerebrum Cerebellum Medulla Oblongata (Brain Stem) Spinal Cord
Central Nervous System
Cerebrum
Voluntary or conscious activities of the body-learning, judgment
Cerebellum
Coordinates and balances the actions of the muscles
Medulla Oblongata
(Brain Stem)
Controls involuntary actions like blood pressure, heart rate, breathing, and swallowing
Spinal Cord
The main communications link between the brain and the rest of the body

10. Consists of: Neurones that leaves the CNS
Peripheral Nervous System
Consists of: Neurones that leaves the CNS
(The one’s in pink!)
-includes all sensory neurons, motor neurons, and sense organs

11. The Nerve
A nerve is an organ containing a bundle of nerve cells called neurons.
Neurons carry electrical messages called impulses throughout the body.
Picture shows hundreds of severed neuron axons

12. Where can the largest cells in the world be found?
Fun Fact:
Where can the largest cells in the world be found?
The giraffe’s neurons! Some must bring impulses from the bottom of their legs to their spinal cord several meters away!!

13. What are our sense organs?
The sense organs are:
The eyes
The ears
The nose
Tongue
skin
These organs sense:
Light
Sound and balance
Smell
Taste
Pressure, pain, temperature

14. How does our nervous system work then?
Our sense organs contain special receptor cells which will detect a change in our surroundings (a stimulus)
The receptor cells will change the stimulus into an electrical impulse which is passed along nerve cells
The message will usually go to the brain which will then process it
The brain then sends a message along nerves to an effector organ (usually a muscle or a gland)
The effector organ will then give a response (e.g. a muscle will move, or a gland will produce a hormone)