Hormones as Chemical Messengers Flashcards

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What is a hormone?

A hormone is a chemical messenger made by a gland that affects target organs.

What do we call organs that make and release hormones into the blood?

These organs are called endocrine glands.

How do hormones travel from the gland to other parts of the body?

Hormones travel in the blood to their target organs.

What is meant by a hormone’s target organ?

A target organ is the organ whose cells are changed or controlled by that hormone.

Why do only some cells in the body respond to a particular hormone?

Only cells with the right receptors for that hormone can respond to it.

Why are hormones described as chemical messengers?

They carry chemical signals from glands to target organs to control body functions.

How do hormonal responses compare in speed with nervous responses?

Hormonal responses are usually slower than nervous responses.

How do hormonal responses compare in how long they last with nervous responses?

Hormonal responses usually last longer than nervous responses.

Give two examples of things in the body that are controlled by hormones.

Examples include growth, blood glucose level and the menstrual cycle.

What does it mean that hormones work in very small amounts?

It means only tiny amounts of a hormone are needed to cause a big change.