Nerves and Hormones
- Created by: alexda
- Created on: 08-05-14 16:09
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- Hormones and Nerves
- Hormones are chemical messengers produced in the glands which travel in the blood to activate target cells.
- Hormones have long lasting effects on the body.
- Hormones travel at the speed of blood which is much slower than nerve impulses.
- They travel all over the body but only affect particular cells in particular places.
- Neurones transmit information as electrical impulses around the body.
- The electrical impulse is passed along the axon of a cell.
- The myelin sheath along the axon acts as an electrical insulator which stops the impulse getting lost. It also speeds up the reaction.
- The nerve impulse is transmitted by neurotransmitters which diffuse across the synapse.
- Nerve impulses act for a very short time on a very price area.
- Hormones are chemical messengers produced in the glands which travel in the blood to activate target cells.
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