Biology - Nerves and Hormones
- Created by: erindutton
- Created on: 25-02-16 09:54
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- Biology Nerves and Hormones
- Receptors
- Receptors are found in the eyes, ears, nose, mouth and skin
- Receptors detect things such as smells, light, pressure, sound and taste.
- Nervous System
- The human central nervous system (CNS) consists of the brain and spinal chord.
- Recetors sends a signal along the neurones to the brain once stimulated.
- Neurones
- Sensory neurones carry signals from the receptors to the spinal cord and brain
- Nerve cells that carry information as tiny electrical signals to the brain.
- Relay neurones carry messages from one part of the CNS to another
- Motor neurones carry signals from the CNS to effectors.
- Between two neurones there is a gap called a synapse. Signals cross the gap using chemicals.
- One neurone releases the chemical signal, causing the next neurone to transmit an electrical signal.
- Reflex Actions
- Sometimes a quick reaction is needed and cannot be processed through the CNS.
- In a simple refex action, the signal goes in the order of stimulus, receptor, sensory neurone, relay neurone, motor neurone and effector.
- An effector is any part of the body that produces the response, eg. muscle contractions, or a gland secreting a hormone or other chemical.
- Receptors
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