FSH and LH are given to a woman to help eggs mature and release. Eggs are then collected from a woman's ovaries. The eggs are fertilised in a lab with...
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15
Name some methods by which scientists study the brain.
MRI, Electrical stimulation, Studying patients with damage to their brain.
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15
What does ethene do?
Stimulates the ripening of fruit.
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15
What do the muscles and glands do in response to stimuli?
Muscles contract and glands secrete chemical substances(hormones).
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15
Explain how the eye focuses on something that is near to it.
The ciliary muscles contract which slacken the suspensory muscles. This causes the lens to become fat (more curved) so increases how much light is ben...
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15
Explain the iris reflex in very bright light.
In very bright light a reflex is triggered to make the pupil smaller. The CIRCULAR muscles CONTRACT and the RADIAL muscles RELAX.
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15
What are the side effects of the pill?
Headaches and nausea. Still contract STIs.
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15
What is the diaphragm?
A plastic cup that fits over the cervix (opening to the womb) to form a barrier.
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15
What is the role of oestrogen in the menstrual cycle?
Produced by the ovaries. Causes the lining of the uterus to grow. Stimulates the release of LH (which causes ovulation) and inhibits the release of FS...
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15
What is the thermoregulatory centre of the brain?
Near the hypothalamus, monitors the temperature of blood.
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15
How does spermicide work?
It kills or disables the sperm.
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15
What are the advantages and disadvantages of a kidney transplant over dialysis?
Kidney transplants are a cure, but they can be rejected. Patients are treated with immunosuppressants. People are not always on the donor list, relati...
