Co-ordination and Control Revision What we are learning about today: Know the names of the various neurones involved the nervous system Know the difference between a reflex action and a conscious action. Know the roles of the hormones used in the menstrual cycle. Know about the role of hormones in plant growth.
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Co-ordination and Control Revision What we are learning about today: Know the names of the various neurones involved the nervous system Know the difference.
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Co-ordination and Control Revision
What we are learning about today:
Know the names of the various neurones involved the nervous system
Know the difference between a reflex action and a conscious action.
Know the roles of the hormones used in the menstrual cycle.
Know about the role of hormones in plant growth.
Neurones and the Nervous System
• Neurones are cells that can transmit electrical _________.
• A __________ picks up a change in the environment.• This sends a signal along a ________ neurone. • The signal reaches the CNS, where it enters a
_______ neurone.• The signal is sent back along a ________ neurone.• An __________ then changes something to do with
the body.
Synapse• Neurones do not
directly touch each other. There is a gap between them called a synapse. So how does the signal get passed along this gap?
A person steps on a pin. Can you describe the pathway of the impulse through the nervous system in this reflex action? (6 marks)
A receptor is stimulated in the skin when the pin is stepped on. This sends signal along a motor neurone to the spine. This riaction is dead quick to avoid harm. The signal is picked up by a relay neurone in the spine. The signal is then sent to an effector which is the leg muscle. This raises up to avoid the pin going proper in the foot. Ouch.
What mark would you give this? How could it be improved?