Nerve cells which carry signals as electrical pulses from the receptor to the CNS
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What are Motor Neurons?
Nerve cells that carry signals as electrical pulse from the CNS (relay neurones) to the effector muscles or gland
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What is a Synapse?
the connection between two neurons
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How doe a signal transfer through a synapse?
Through chemical diffusion
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What is a reflex action?
An automatic response
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What are the 5 Sense Organs of the human body?
Eyes (light), Ears (sound, balance), Nose (smell), Tongue (taste), Skin (touch, pressure, temperature change, pain)
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What are the 5 steps of The Reflex Arc, in detail?
1.The receptor detects a Stimulus; 2.An electrical impulse is sent down the sensory neuron; 3.The impulse is passed through the CNS in the relay neuron; 4.The impulse travels through the motor neuron; 5.It then reaches the effector which responds
What are six main differences between nerves and Hormones
Nerves: 1.Very Fast Message; 2.Act for a very short time; 3.Act on a very precise area. Hormones; 1.Slower message; 2. Act for a long time; 3.Act in a more general way.
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Describe the four stages of the Menstrual Cycle
1.The uterus lining breaks down for about 4 days; 2.the uterus build up again (from day 4 to 14), ready to recieve a fertilised egg; 3.The egg is dveloped and released; 4. The wall is maintained for 14 days, if no egg the cycle starts again.
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What three hormones control the different stages of the Menstrual Cycle?
FSH, Oestrogen, LH
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In which order do Oestrogen, LH, FSH go?
FSH, Oestrogen, LH
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What does FSH do?
1. Causes an egg to mature in one of the ovaries; 2.Stimulates the Ovaries to produce Oestragen
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Where is FSH produced?
The Pituitary Gland
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What does LH do?
Stimulates the release of an egg
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Where is LH produced?
The Pituitary Gland
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What does Oestrogen do?
1. Causes the pituitary gland to produce LH; 2.Inhibits the release of FSH.
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Where is Oestrogen produced?
The Ovaries
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How can Oestrogen be used to stop fertility?
To inhibit the release of FSH, which matures a fertilised egg
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Other cards in this set
Card 2
Front
What are Sensory Neurons?
Back
Nerve cells which carry signals as electrical pulses from the receptor to the CNS
These are a concise set of cards on the nervous system, hormones and behaviour which could be useful for any students studying these topics for GCSE Biology or science.
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