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31 Cards in this Set
- Front
- Back
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What is a synapse?
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A gap where two neurones meet.
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What does a receptor do?
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Stimulates and sends a signal along the nerve cells (neurones) to the brain.
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What does an effector do?
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Produces a response.
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What does the nervous system consist of?
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The brain and spinal cord.
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What is a reflex action?
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An extra-rapid response to a stimulus.
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Is the brain involved in reflex actions?
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No!
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What are receptors?
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Specialised cells that detect stimuli.
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What is a stimulus?
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A change in the environment.
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How do signals cross the synapse?
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One neurone releases a chemical into the gap (synapse). The chemical diffuses across the gap, making the next neurone transmit an electrical signal.
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What are the receptors in the eyes sensitive to?
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Light.
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What are the receptors in the ears sensitive to?
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Sound and the position of the head.
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What are the receptors in the tongue sensitive to?
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Chemicals in food.
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What are receptors in the nose sensitive to?
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Chemicals in the air.
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What are receptors in the skin sensitive to?
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Touch, pressure, pain and temperature.
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Name the three types of neurones.
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Sensory, Relay and Motor.
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What does the Motor neurone do?
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Carries signals from the CNS to the effectors.
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What does the Sensory neurone do?
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Carries signals to the spinal cord and brain from the receptors.
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What does the Relay neurone do?
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Carries messages from one part of the CNS to another.
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Do neurones (nerve cells) contain a nucleus?
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Yes.
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What are hormones secreted by?
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Glands.
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Where are the hormones transported from the glands to the organs?
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Bloodstream.
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Name the glands.
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Brain, Thyroid gland, Pancreas, Testes, Adrenal glands and Ovaries.
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What is the body controlled by?
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The nervous system & hormones.
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What causes an egg to mature in the ovary?
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FSH.
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What stops FSH produce so only one egg can mature?
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Oestrogen.
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What stimulates the ovaries so the hormone oestrogen can be produced?
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FSH.
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What is tropism?
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The growth in response to a stimulus.
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What is auxin?
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A plant hormone that controls the direction of growth.
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Where is auxin made?
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In the tips of the roots and shoots of a plant.
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What is phototropism?
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Tropism where light is the stimulus.
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Name 2 uses of plant hormones.
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1. Weed killers.
2. Rooting powder. |
