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Key Questions:

1. What is the endocrine system and what is its role?
   • The endocrine system is composed of glands which secrete chemicals called hormones directly into the bloodstream.
2. What are the names of the glands labelled 2, 4, 6, 7, 8 and 9 in the following image? http://bit.ly/2Cy01Tj
   • Number 1 is the pituitary gland, number 2 the thyroid, number 6 are the adrenal glands and number 7 the pancreas. Number 8 are the ovaries and number 9 the testes.
3. What is the role of the bloodstream in the endocrine system?
   • The blood carries the hormone to a target organ where it produces an effect.
4. How does the endocrine system compare to the nervous system?
   • Compared to the nervous system the effects are slower but act for longer.
5. What is the pituitary gland described as and what is its role?
   • The pituitary gland in the brain is a "master gland" which secretes several hormones into the blood in response to body conditions.
6. What do the hormones released by the pituitary gland do?
   • The hormones released by the pituitary gland act on other glands to stimulate other hormones to be released to bring about effects.
7. (HT) Where are thyroxine and adrenaline created in the body?
   • (HT) Thyroxine - thyroid gland. Adrenaline - adrenal gland.
8. (HT) What is the role of adrenaline in the body?
   • (HT) Adrenaline is produced by the adrenal glands in times of fear or stress. It increases the heart rate and boosts the delivery of oxygen and glucose to the brain and muscles, preparing the body for "flight or fight".
9. (HT) What is the role of thyroxine in the body?
   • (HT) Thyroxine from the thyroid gland stimulates the basal metabolic rate. It plays an important role in growth and development. (HT only)
10. (HT) How are thyroxine levels controlled?
    • (HT) The thyroxine levels are controlled by negative feedback.