The endocrine device is comprised of every the significant glands, which act to manage hormones in the human body (Fig. 12-1). Various endocrine organs produce and also secrete this hormones in order to keep homeostasis, i m sorry is characterized as the state of dynamic equilibrium. In various other words, the hormones act with each other to save the body internal environment healthy. Some hormones act straight on target organs; others stimulate certain glands come secrete yet various hormones.

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Hormone level in the blood might vary follow to bodily functions. Hormones usually work in bag to preserve a healthy balance, through one exhilaration to raise levels of various other substances as soon as needed and also the various other acting to lower levels once needed. For example, the hormone calcitonin and parathyroid hormone role in one opposite, yet complementary, fashion to keep a healthy level of calcium in the blood.

Endocrine glands are responsible for the sex-related maturation of individuals from childhood to adolescence and into adulthood. Endocrine glands additionally play a role in the body’s capacity to metabolize food and also store energy.

Learning format Tip Study figure 12-1 and also then develop a fun and also colorful 3-D design that an in similar way illustrates the pituitary gland, the hormone it produces, and also the target offal the hormones affect. An instance might be a hanging mobile through the pituitary gland at the top and also labeled “hormone” strings, each of i beg your pardon dangles its corresponding target organ(s). Once you’ve perfect it, show and also explain your design to one or more classmates.

The pituitary gland is a small, round, pea-sized structure attached come the reduced surface the the hypothalamus in the brain. It is typically called the master gland because it controls all of the various other glands in the body. (Even so, the pituitary is actually managed by the hypothalamus.) The pituitary gland is separated into an anterior lobe and a posterior lobe. These 2 parts role separately come produce countless different hormone (Fig. 12-2). The anterior lobe secretes the complying with six hormones:


Growth hormone (GH) promotes the expansion of human body structures, such together bones.

Thyroid-stimulating hormone (TSH) influence the growth and also functioning of the thyroid gland.

Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are described as gonadotropins since they action on the gonads—the ovaries in the female, to create an ovum, and also the testes in the male, to create sperm.

Prolactin acts upon the mammary glands to develop milk.

Adrenocorticotropic hormone (ACTH) acts on the adrenal glands to secrete glucocorticoids, consisting of cortisol.

figure 12-2

Pituitary gland: (A) anterior and also posterior watch (B) hormones and also target glands. (From Eagle, S., et al. <2009>. The skilled medical assistant. Philadelphia, PA: F. A. Davis Company, p. 523; with permission)

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