ANATOMY

Detailed explanation-1: -The cells in these glands secrete specific chemicals called hormones. Hormones circulate around the body via the blood stream and modulate cellular or organ functions by binding with receptors in the target cells. Hormones that stimulate and control the activity of other endocrine glands are called trophic hormones.

Detailed explanation-2: -The glands that make up the endocrine system produce chemical messengers called hormones that travel through the blood to other parts of the body. Important endocrine glands include the pituitary, thyroid, parathyroid, thymus, and adrenal glands.

Detailed explanation-3: -The hormones of the human body can be divided into two major groups on the basis of their chemical structure. Hormones derived from amino acids include amines, peptides, and proteins. Those derived from lipids include steroids. The two main groups of steroid hormones: adrenocortical hormones and sex hormones.

Detailed explanation-4: -Steroid hormones are derived from the cholesterol and eicosanoid hormones from fatty acids that compose the plasma membrane. The third class of hormones is the monoamines that are derived from aromatic amino acids like phenylalanine, tyrosine, and tryptophan.