IGCSE Biology – Coordination And Response Practice Test

What best describes the difference between hormones and nerve impulses?

Hormones are electrical signals carried along neurons. Nerves use slow chemical signals through the bloodstream. Hormones are chemical signals carried in blood, acting slowly on many organs. Nerve impulses travel in hormones to target organs.

Correct Answer:

Hormones are chemical signals carried in blood, acting slowly on many organs.

Explanation:

The difference being tested is how signaling in the body occurs through hormones versus nerve impulses. Hormones are chemical signals released into the bloodstream by glands, so they travel around the body and can affect many organs. Because they rely on circulation and receptor interactions, their effects start more slowly and tend to last longer. In contrast, nerve impulses are electrical signals that travel along neurons, giving rapid, precise responses to a specific target. They don’t spread through the blood to many organs and are typically short-lived. So the best description is that hormones are chemical signals carried in blood, acting slowly on many organs. Electrical nerve impulses move quickly along nerves to targeted tissues, not through the bloodstream.

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