Gastrointestinal Tract

What is GI motility and the release of GI secretion carefully regulated by?

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There are three general mechanisms that govern the secretion or release of a hormone; humoral, hormonal, and neural. Humoral release is governed by the presence of certain ions or nutrients in the blood. For example, the amount of glucose in your blood determines whether insulin or glucagon is secreted. Hormonal release is stimulated by the presence of other hormones. An example would be thyroid stimulating hormone secreted by the anterior pituitary stimulates the production/secretion of thyroid hormone. Finally, neural release is governed by nervous system controls. The classic example of neural release is neurons from your sympathetic (fight-or-flight) nervous system determine the release of adrenaline (epinephrine) from the adrenal glands.

Most hormone secretions are regulated by negative feedbacks. The 3 main feed backs are:1)(Blood level of certain chemicals controls hormone secretion) Blood composition; Ex: blood glucose levels control the insulin secretion.2)(Hormones controlled by nervous system) Neural control; Ex: Epinephrine is release from adrenal medulla as result of nervous system stimulation.3)(Hormone secretion controlled by other hormones) Hormonal control; Ex: hormones from pituitary gland act on the ovaries and testes causing release of sex hormones.Source: Seeley's Essentials of Anatomy and Physiology (seventh edition)

ADH secretion and oxytocim release

no, it's release is the effect of a positive control feedback mechanism

Hormones are secreted (secrete, secretion) out of their respective glands.

decreased secretion of ANP (atrial naturetic peptide)

FSH, secreted by the Pituitary gland,stimulates the secretion of Oestrogen from the ovaries, Oestrogen in turn stimulates the secretion of LH by the pituitary and inhibits the secretion of FSH, LH then stimulates ovulation (the release of an egg). Without FSH this chain reaction does not happen.

PRH stimulates the release of prolactin.PIH inhibits the production.Those are produced by hypothalamus.

The sebaceous glands, which release the oily substance called sebum that mainly causes acne. :)

The liver releases bile, and the pancreas releases digestive enzymes.

The release of substances such as hormones or vitamins from cells is known as secretion. This is made possible by the hormonal endocrine system.

no, some are also regulated by the testes and ovaries that release sex hormones like testosterone in males and progesterone and estrogen in females.

Merocrine Glands release its product and no part of the gland is lost or damaged.

'Production' is a manufacturing process while 'Secretion' is a release process. For instance, bile, which is required for the digestion of fats and oil in the GI tract is 'produces' by the liver but is 'secreted' by the gall bladder. This is because when the liver cells produce bile, it gets stored in the gall bladder. Presence of fatty foods in the gut then stimulates its release (secretion). Most organs, however, combine functions of production and release simultaneously but any organ that secretes is better refered to as a 'gland'. - J. B. DAVIS

The small sac-shaped organ beneath the liver, in which bile is stored after secretion by the liver and before release into the intestine.

Carefully - 2003 was released on: USA: 31 October 2003 (Chicago Horror Film Festival)

It is regulated by hormones, but its job is not to release them. The endocrine system releases hormones. The urinary system expels waste from the body.

Glands are the parts of the body that are responsible for the secretion of hormones. Different glands release different hormones eg the pancreas releases insulin and the adrenal glands release adrenaline.

The nervous and endocrine systems regulate release of pancreatic juice, as they do gastric and small intestinal secretions.

Aldosterone is a hormone that increases the reabsorption of sodium ions and water and the release (secretion) of potassium ions in the distal convoluted tubules of the kidneys. This increases blood volume and, therefore, increases blood pressure. Drugs that interfere with the secretion or action of aldosterone are in use as antihypertensives.

Absorption is when particles are dissolved and taken in. Digestion is when you break down particles. Secretion is the release of a substance by a cell.

Use it carefully. Clean it after every ski.

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