Question | Answer |
Name the 5 senses and how they are stimulated | Sight - light
Hearing - sound
Taste - chemical substances
Smell - chemical substances
Touch - heat and pressure |
Name the 2 main parts of the nervous system | 1. The central nervous system(CNS) - brain and spinal chord.
2. The peripheral nervous system - the nerves that branch off from the CNS. |
What protects the spinal chord | The backbone and the spinal column |
What is the brains function | It allows us to think and make descisions |
How does the brain communicate with the body | By passing impulses along the nerves |
What is a neuron | This is a nerve cell |
What is a spinal chord | An extension from the brain which nerves branch out |
What is a group of neurons called | A nerve |
List the 2 types of neuron | 1. Motor
2. Sensory |
What's the difference between a motor and a sensory neuron | Motor neurons bring the impulses from the CNS to the muscles whereas sensory neurons bring the impulses from the muscles to the CNS |
What's the function of the eye | To distinguish colour and to detect light |
What's the advantage of having two eyes | It gives one the ability to judge distance |
What's the function of the lens | To focus light on the retina |
What's the function of the iris | To change the size of the pupil to allow varied levels of light to enter the eye |
What is the coloured part of the eye called | The iris |
Why do pupils get bigger in the dark | To allow more light to enter the eye |
What part of the eye detects light | The retina |
What connects the eye to the brain | the optic nerve |