MICROANATOMY

Detailed explanation-1: -Hormones act as chemical messengers that are released into the blood stream to act on an organ in another part of the body. Although hormones reach all parts of the body, only target cells with compatible receptors are equipped to respond. Over 50 hormones have been identified in humans and other verterbrates.

Detailed explanation-2: -Endocrine glands secrete hormones straight into the bloodstream. Hormones help to control many body functions, such as growth, repair and reproduction.

Detailed explanation-3: -The glands that make up the endocrine system produce chemical messengers called hormones that travel through the blood to other parts of the body.

Detailed explanation-4: -The correct answer is (a) paracrine. A chemical messenger stimulating the initially secreted cell is known as paracrine.

Detailed explanation-5: -The endocrine system uses chemical signals called hormones to convey information from one part of the body to a distant part of the body. Hormones are released from the endocrine cell into the extracellular environment, but then travel in the bloodstream to target tissues.