There are several organs whose primary functions are non-endocrine but that also possess endocrine functions.…

Both the endocrine and nervous systems use chemical signals to communicate and regulate the body’s…

Hormone production and release are primarily controlled by negative feedback. In negative feedback systems, a…

Regulation of blood calcium concentrations is important for generation of muscle contractions and nerve impulses,…

Blood glucose levels vary widely over the course of a day as periods of food…

Hormones have a wide range of effects and modulate many different body processes. The key…

Hormones mediate changes in target cells by binding to specific hormone receptors. In this way, even…

Figure 18.1.  The process of amphibian metamorphosis, as seen in the tadpole-to-frog stages shown here,…

Audition, or hearing, is important to humans and to other animals for many different interactions.…

A pheromone is a chemical released by an animal that affects the behavior or physiology of animals…