Name each gland as endocrine, exocrine or both…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name each gland as endocrine, exocrine or both.
- A salivary gland.
- The thyroid gland.
- The pancreas.
- A sweat gland.
- The pituitary gland.
- The blood reaches every cell of the body. Why does a hormone still act only on its target cells?
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) Exocrine. Saliva flows along a duct into the mouth.
Step 2. (b) Endocrine. It pours thyroxine and T3 into the blood.
Step 3. (c) Both. It sends digestive juice along a duct, and its islets make insulin and glucagon for the blood.
Step 4. (d) Exocrine. Sweat leaves along a duct to the skin.
Step 5. (e) Endocrine.
Step 6. (f) Only the target cells have the receptor that fits the hormone. The other cells do not respond.
Answer: (a) exocrine; (b) endocrine; (c) both; (d) exocrine; (e) endocrine; (f) only the target cells have the matching receptor.
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