Question

select all that apply
which of the following are characteristics of circulating hormones?

• cells that react to a hormone have specific receptors for that hormone.
• hormones are released from exocrine glandular cells.
• hormones are secreted into the interstitial fluid and then enter the bloodstream.
• hormones may affect distinct aspects of a target cell physiology.

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Explanation:

1. For "Cells that react to a hormone have specific receptors for that hormone": Target cells (cells that react to a hormone) must have specific receptors to bind the hormone, so this is a characteristic.
2. For "Hormones are released from exocrine glandular cells": Hormones are released from endocrine glandular cells (exocrine glands secrete substances like enzymes through ducts, not hormones into the bloodstream), so this is incorrect.
3. For "Hormones are secreted into the interstitial fluid and then enter the bloodstream": Endocrine glands secrete hormones into interstitial fluid, which then enters the bloodstream for circulation, so this is a characteristic.
4. For "Hormones may affect distinct aspects of a target cell physiology": Hormones can influence various physiological processes of target cells (e.g., metabolism, growth, etc.), so this is a characteristic.

Answer:

• Cells that react to a hormone have specific receptors for that hormone.
• Hormones are secreted into the interstitial fluid and then enter the bloodstream.
• Hormones may affect distinct aspects of a target cell physiology.