Question

question 1-9
which of these is the best example of a chemical signal from one cell type regulating processes in another type of cell?
acetylcholine from the axon of neurons acts on neighboring dendrites.
insulin produced by islets of langerhans stimulates the liver to store glucose.
fibrinogen in the blood forms bridges between platelets helping clots to form.
antibodies produced by b cells attack viruses that have infected the body.

Explanation:

1. Acetylcholine between neurons is a neural - signal within the nervous system.
2. Insulin produced by islets of Langerhans (pancreatic cells) travels through the blood to stimulate the liver (a different cell - type) to store glucose, which is a classic example of a chemical signal from one cell type regulating another.
3. Fibrinogen forming bridges between platelets is part of the blood - clotting process and not a regulatory signal between different cell types in the same sense.
4. Antibodies attacking viruses is an immune response, not a regulatory signal between different cell types for normal physiological processes.

Answer:

B. Insulin produced by islets of Langerhans stimulates the liver to store glucose.