GENERAL HISTOLOGY

Detailed explanation-1: -Hormones turn on, turn off, speed up, or slow down the activities of different organs and tissues. You can think of a hormone as a chemical messenger. Hormones are carried throughout the body by the blood.

Detailed explanation-2: -The endocrine system is made up of glands that make hormones. Hormones are the body’s chemical messengers. They carry information and instructions from one set of cells to another. The endocrine (EN-duh-krin) system influences almost every cell, organ, and function of our bodies.

Detailed explanation-3: -Humoral Stimuli A humoral stimulus refers to the control of hormone release in response to changes in extracellular fluids such as blood or the ion concentration in the blood. For example, a rise in blood glucose levels triggers the pancreatic release of insulin.

Detailed explanation-4: -Hormone production and release are primarily controlled by negative feedback. In negative feedback systems, a stimulus elicits the release of a substance; once the substance reaches a certain level, it sends a signal that stops further release of the substance.

Detailed explanation-5: -Hormonal agents may be broken down into two primary forms, slow acting (steroid and thyroid) and fast acting (peptides and catecholamines). The slow acting hormones must first penetrate the cell membrane and enter the nucleus of the cell.