Question

All of the following statements are true about hormones except

• A. They are transporated by the circulatory system
• B. They bind to receptors on target cells
• C. They must be present in large quantities to have an effect
• D. They are secreted by endocrine glands
• E. They can affect organs of the body that are far removed from their site of synthesis

Answer 1

The correct option is C They must be present in large quantities to have an effect

1. Hormones are produced by specialized glands(endocrine glands) and are secreted directly into the bloodstream.

2. Hormones are transported by the bloodstream from the endocrine cells to serve as ‘chemi­cal messenger’ which act on target cells or organs by regulating the rates of specific metabolic reactions.

3. Hormones exert their effects not where they are locally produced, but on other tissues of the body.

4. Hormones are required in very small amounts and their effect may be excitatory or inhibitory depending upon their concentration and the physiological state of the responding tissue. Hence, All of the following statements are true about hormones except They must be present in large quantities to have an effect.

So, the correct answer is 'They must be present in large quantities to have an effect'.