In each case one hormone of the pituitary gland is missing…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In each case one hormone of the pituitary gland is missing. Name it.
- A mother can make milk, but the milk is not ejected when the baby sucks.
- A man has normal androgens but a very low count of sperm.
- A person passes several litres of dilute urine a day, and the urine has no sugar.
- A woman has no ovulation, although her follicles grow normally.
- A patient has a low level of cortisol because the adrenal cortex is not being stimulated.
Need a reminder? The key ideaShow
Pars distalis: GH, PRL, TSH, ACTH, LH, FSH. Pars intermedia: MSH. Pars nervosa: oxytocin and vasopressin (ADH). The kidneys filter 180 L of fluid in a day. ADH makes the distal tubules reabsorb more water, so the urine is less in volume and more concentrated.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Oxytocin. It makes the smooth muscles around the milk glands contract.
Step 2. (b) FSH. With the androgens it regulates spermatogenesis.
Step 3. (c) Vasopressin (ADH). The disorder is diabetes insipidus.
Step 4. (d) LH. It induces ovulation of the mature follicle. FSH has already made the follicles grow.
Step 5. (e) ACTH. It stimulates the adrenal cortex to make glucocorticoids such as cortisol.
Answer: (a) oxytocin; (b) FSH; (c) vasopressin; (d) LH; (e) ACTH.
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