what type of impulses does the nervous system use?
electrical impulses
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What are reflex actions?
-automatic and rapid responses to stimuli -they run every day functions and help you avoid danger
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Define reflex
rapid automatic response oif the nervous system that does not involve conscius thought
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Define synapse
a gap between neurons where the transmission of information is chemical rather than electrical
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Define reflex arc
the sense organ, sensory neurone, relay neurone, motor neurone and the effector organ which bring about a reflex action
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what do hormones do in the menstrual cycle?
Hormones control the release of an egg from the ovary and the build-up of the lining of the womb in the menstrual cycle Some of the hormones involved are FSH from the pituitary gland and oestrogen from the ovary
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What is the role of FSH?
causes egg to mature and stimulates ovary to produce oestrogen
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How can hormones can be used to control fertility?
Oral contraceptives contain certain hormones which stop FSH production so no more eggs mature FSH can be used as a fertility drug for women, to stimulate eggs to mature in their ovaries. Their eggs may be used in IVF treatments.
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Define IVF
the fertillisation of eggs outside of the body in a glass container
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what do humans need to maintain? (in their body)
a constant internal environment, controlling levels of water, ions and blood sugar, as well a temperature
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define homeostasis
the result of the coordination system, your hormones and your body organs
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what does widening the cappileries do?
Widening capillaries causes more heat to be carried by the blood to the skin, where it can be lost to the air.
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what do the kidneys do
The kidneys control the amount of water and ions in the blood by producing urine. Urine contains the excess salts and water that the body does not need.
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what are plants ensitive to?
Plants are sensitive to light, moisture and gravity
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what are plant responses due to?
Plants responses are brought about by plant hormones (auxin).
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what is the cause of unequal distribution of plant hormones?
The responses of roots and shoots to stimuli such as gravity are the result of the unequal distribution of plant hormones.
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