PHS 3507 Chapter Notes - Chapter 18: Thyroid, Pineal Gland, Anterior Pituitary
22 Sep 2017
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Communication occurs between 2 cells of the same type and the cells must be in extensive physical contact. When the secondary effects occur, the paracrine factors are also acting as hormones (chemical messengers that are released in 1 tissue and transported in the blood stream to alter the activities of specific cells in other tissues). Defines the major chemical classes of hormones and describe the general mechanism of action on target issues. The individual hormones differ in the side chains. Explain the role of second messenger systems in the action of hormones. Instead the hormone uses a intercellular intermediary to bring about its effects. The hormone (first messenger) does something that lead to the appearance of a second messenger in the cytoplasm. The second messenger may act as an enzyme activator, inhibitor or cofactor. The net result is a change in the rates of various metabolic reactions.
