Hormones may function as endocrine, paracrine and autocrine signals. True False

True. Hormones can indeed function as endocrine, paracrine, and autocrine signals.

1. Endocrine signals: These are hormones that are secreted directly into the bloodstream by the endocrine glands. They travel through the blood to reach target cells that may be located far away from the gland that produced and secreted the hormone.

2. Paracrine signals: These are hormones that act on neighboring cells. They are secreted into the extracellular fluid and affect nearby target cells.

3. Autocrine signals: These are hormones that act on the same cell that produced and secreted them. They are also secreted into the extracellular fluid, but they affect the same cell that produced them.