Six glands are listed: the salivary gland, the thyroid gland, the goblet cell, the sweat gland, the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Six glands are listed: the salivary gland, the thyroid gland, the goblet cell, the sweat gland, the adrenal gland and the pancreas.
- Which are exocrine glands?
- Which are endocrine glands?
- Which one belongs in both groups, and why?
- A hormone leaves an endocrine gland. By what route does it reach a distant target?
Need a reminder? The key ideaShow
Cell junctions join the cells of a tissue. Tight junctions stop substances from leaking between cells. Adhering junctions cement neighbouring cells together. Gap junctions join the cytoplasm of adjoining cells so that ions and small molecules pass quickly. A gland is made of cells that secrete. A goblet cell is a unicellular gland, and the salivary gland is multicellular. Exocrine glands send their products through ducts. Endocrine glands have no duct and release hormones into the fluid around them.
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) The salivary gland, the goblet cell and the sweat gland. Their products leave through ducts or, for the goblet cell, onto the surface.
Step 2. (b) The thyroid gland and the adrenal gland. They have no ducts.
Step 3. (c) The pancreas. Its enzymes leave by a duct (exocrine). Insulin and glucagon go into the blood (endocrine).
Step 4. (d) The hormone enters the fluid around the gland and then the blood. The blood carries it to the target.
Answer: (a) salivary, goblet, sweat; (b) thyroid, adrenal; (c) pancreas; (d) through the blood.
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