Exam-style Questions: Homeostasis



  1. Fill in the missing words...

    Why do we need homeostasis?

    If there was not a constant___(i)___ environment, our ___(ii)___ would not work properly. That would mean that nothing would operate properly and we would ___(iii)___.

    (Marks available: 3)



    Answer outline and marking scheme for question: 1

    (i) internal;

    (ii) enzymes;

    (iii) die.

    (Total = 3 marks)

  2. Name 3 organs of the body that are involved in homeostasis and briefly explain what they do.

    (Marks available: 6)



    Answer outline and marking scheme for question: 2

    Choose any 3 of the following, with a short summary of what they do...

    Through the hypothalamus and pituitary glands the brain has a long-lasting and powerful effect on the body by involving hormones.

    The hypothalamus monitors water, temperature and the level of carbon dioxide in the blood.

    The pituitary gland secretes a number of hormones - a key one is ADH, which is important in regulating the water content of the body.

    The liver helps to control glucose content of the body by storing it as glycogen. It is also involved in temperature regulation, acting as the body's furnace by increasing the rate of respiration when we are cold.

    The lungs are involved by getting rid of carbon dioxide from the body.

    The pancreas is involved in maintaining a constant amount of glucose in the body through the actions of glucagon and insulin.

    The muscles of the body can help to maintain a stable body temperature as muscular activity and shivering help to generate heat.

    The kidney is involved in controlling the amount of water in the body.

    The skin is the largest organ and has a central role in maintaining a constant temperature.

    (Total = 6 marks)

  3. When there is too little water in the body, a sequence of events occurs. Fill in the missing words to complete the process:

    Too little water in blood.

    Detected by___(i)___.

    More___(ii)___ released into blood by the ___(iii)___.

    ___(iv)___ reabsorbs more water.

    Less ___(v)___ produced.

    Blood water level not reduced further.

    (Marks available: 5)



    Answer outline and marking scheme for question: 3

    (i) hypothalamus;

    (ii) adh;

    (iii) pituitary gland;

    (iv) kidney;

    (v) urine.

    (Total = 5 marks)