1[1 mark]
Which row correctly matches a gland with a hormone it produces?
- Testes and insulin
- Ovaries and oestrogen
- Pituitary gland and thyroxine
- Thyroid gland and adrenalin
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Answer: B B (1)
2[2 marks]
Describe how a hormone gets from an endocrine gland to its target organ.
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- the gland secretes / releases the hormone into the blood (1) allow bloodstream
- the blood (plasma) carries the hormone to the target organ (1) do not accept nerves
3
Higher tier
[4 marks]A person is startled by a loud noise and the adrenal glands release adrenalin. Explain how adrenalin prepares the body for fight or flight.
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- increases heart rate (1)
- increases blood pressure (1)
- increases blood flow to the muscles (1)
- so more oxygen and glucose are delivered for respiration (1)
- stimulates the liver to change glycogen into glucose (1)
- raising blood sugar (glucose) level (1)
- Max 4
4
Higher tier
[4 marks]The level of thyroxine in a person's blood falls below normal. Explain how the body returns the level of thyroxine to normal.
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- low thyroxine stimulates the hypothalamus to produce TRH (1)
- TRH causes the pituitary gland to release TSH (1)
- TSH acts on the thyroid gland to produce thyroxine (1)
- when thyroxine is back to normal it inhibits the release of TRH and the production of TSH (1) allow negative feedback