85380
Description
Flashcards by zolas_horses, updated more than 1 year ago
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Created by zolas_horses
over 11 years ago
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| Question | Answer |
| What happens when a bright light is shone into the eye? | STIMULUS - A light shines in the eye RECEPTOR - The retina (In the back of the eye) COORDINATOR - The brain (via the optic nerve) EFFECTOR - The iris muscle contracts RESPONSE - Pupil diameter gets smaller |
| What is the purpose of the eyes reflex action? | To prevent too much light entering the eye |
| Why is the brain the Coordinator in the eyes reflex rather than the spinal cord? | It is closer to the brain |
| What is the name given to the pathway that message follow in a reflex? | The reflex arc |
| What is the gap called between each neurone? | The synapse |
| What does the synapse do? | It releases chemicals called neurotransmitters to carry the message across the gap between neurones |
| What is the sclera? | The sclera helps maintain the shape of the eye. |
| What is the cornea? | The cornea is the curved transparent disc which helps focus the light in the eye. |
| What is the pupil? | A circular opening which allows light to enter the eye |
| What is the iris? | The muscular colored part of the eye, controls the pupil diameter |
| What is the lens? | The flexible lens which changes shape to help focus on near and distant objects |
| What is the choroid? | The black pigment which stops internal reflection. It has good supply also supplies the retina with food and oxygen |
| What is the retina? | It contains a light sensitive rod and cone cells, iamges form here |
| What is a blind spot? | Where optic nerve leaves the eye, no rods or cones. |
| What is the optic nerve? | The optic nerve send message from the eye to the brain |
| What does the nervous system consist of? | The brain, spinal cord and nerves |
| What are the main 5 sense organs and their stimulus' and senses? | The eye which stimulus is light and gives the sense sight, The nose which stimulus is chemical and gives the sense smell, The tongue which stimulus is chemical and gives the sense taste, The Skin which stimulus is temperature, pressure and texture and gives the sense touch and The ear which stimulus is sound/gravity and gives the sense hearing and balance. |
| What is the name of the place where the information is sent that the sense organs collect? | The central nervous system |
| How is the information from the sense organs carried to the CNS? | As electrical messages along the nerves (neurons). These signals are known as nerve impulses. |
| What is a reflex action? | A reflex is a fast automatic response to a stimulus. It does not involve conscious effort and will protect the body from harm. |
| What are the steps in a reflex actions? | STIMULUS - This is the change that is detected. RECEPTOR - These are the cells that detect the change. COORDINATOR - This organises the information (The brain). EFFECTOR - Causes the body to do something RESPONSE - What the body does ((Some rhinos can't eat rice)) |
| What are the three different types of neurone in a reflex action? | The sensory neurone - This carries impulses from the receptor to the CNS The Relay neurone - This carries the impulses through the CNS The motor neurone - This carries impulses from the CNS to the effector |
| What are some common reflexes? | - The eye waters when dirt enters it - The leg straightens when it is tapped below the knee - Withdrawal reflexes - Pupil diameter reflex |
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