For each hormone, say where it is made and how it reaches the blood…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
For each hormone, say where it is made and how it reaches the blood.
- Gonadotropin releasing hormone (GnRH).
- Oxytocin.
- Somatostatin.
- Vasopressin.
- Which two hormones of the anterior pituitary does GnRH make the pituitary release?
Need a reminder? The key ideaShow
Hormones are non-nutrient messengers made in trace amounts by ductless glands. After a gland stops, the amount in the blood halves in each half-life. The hypothalamus makes releasing and inhibiting hormones that reach the anterior pituitary by the portal system. Oxytocin and vasopressin are made in the hypothalamus and released from the posterior pituitary.
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) GnRH is made by neurosecretory cells of the hypothalamus. The portal vessels carry it to the anterior pituitary.
Step 2. (b) Oxytocin is made in the hypothalamus. It travels along nerve fibres to the posterior pituitary, which stores it and releases it into the blood.
Step 3. (c) Somatostatin is made in the hypothalamus. The portal vessels carry it to the anterior pituitary, where it inhibits growth hormone.
Step 4. (d) Vasopressin follows the same route as oxytocin: made in the hypothalamus, carried by nerve fibres, released from the posterior pituitary.
Step 5. (e) LH and FSH.
Answer: (a) and (c) reach the anterior pituitary by the portal system; (b) and (d) reach the posterior pituitary along nerve fibres; (e) LH and FSH.
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