hormones Flashcards
Are secreted from the glands of the endocrine system, they are specific in that each hormone causes a response in a specific target organ or group of cells, rather than on the body as a whole.
HORMONE
These are secreted via a duct into the blood and usually effect a distant organ or tissue.
EXOCRINE HORMONES
These are secreted within the tissue (rather than via a duct) and enter the blood stream via capillaries.
ENDOCRINE HORMONES
Hormones can be classified according to their:
I. Chemical Nature
II. Mechanism of Action
III. Nature of Action
IV. Effect of Hormones
V. Stimulation of Endocrine Glands
Chemical Nature of hormones are divided to six (6) classes, they are:
Steroid
Amine
Peptide
Protein
Eicosanoid
Glycoprotein
Derived from cholesterol which belong to a chemical compounds known as steroids.
STEROID HORMONES
Ex of Steroid Hormones
Sex hormones
Adrenal cortex hormones
These are derived from the modification of amino acids. Typically, the original structure of the amino acid is modified such that a COOH, or carboxyl, group is removed, whereas the NH3 +, or amine group remains.
AMINE HORMONES
Amine hormones are synthesized from the amino acids ____ or ___.
TRYPTOPHAN or TYROSINE
An example of a hormone derived from tryptophan
MELATONIN
Tyrosine derivatives include
THYROID HORMONES AND CATECHOLAMINES
These hormones are made up of only few amino acid residues and they are usually present themselves in a form of linear chains.
PEPTIDE HORMONES
Ex of Peptide Hormones
Oxytocin
Vasopressin
These hormones are build up from large number of amino acid residues.
PROTEIN HORMONES
Ex of Protein Hormones
Insulin
Glucagon
Somatotropins
These are conjugated protein bound to carbohydrate which include galactose, mannose, fructose.
GLYCOPROTEIN HORMONES
Ex of Glycoprotein Hormones
LH - Luteinizing hormones
FLH - Follicle stimulating hormones TSH - Thyroid stimulating hormones
Made up of small fatty acid derivatives with a variety of arachidonic acid.
EICOSANOID HORMONES
Ex of Eicosanoid Hormones
PROSTAGLANDINS
Steroid Hormones are classified according to the organs that synthesize them therefore this hormone are classified as:
Sex hormones
Adrenal cortex hormones Placenta hormones
These are group of hormone that produced in the testes in males and ovaries in the female.
SEX HORMONES
The male sex hormones are usually referred to as
ANDROGENS
The principal androgen is known as
TESTOSTERONE
These hormones are produced primarily by the testes and in discrete amounts by the adrenal cortex.
SEX HORMONES
These are primarily responsible for the proper development and maintenance of male reproductive function and stimulation of the secondary sex characteristics.
ANDROGENS
Are anabolic, and used in stimulating the production of skeletal muscles and bone as well as red blood cells.
ANDROGENS
In order to enhance the anabolic activity of androgens without increasing their masculinizing ability, ____ were developed to combat diseases marked by wasting, these synthetic hormones have been abused by individuals desiring to increase their muscle mass, such as athletes seeking to gain a competitive advantage.
ANABOLIC STEROIDS
It has been linked to serious side effects, including infertility and coronary heart disease.
OVERDOSING
Two female sex hormones
ESTROGENS
PROGESTINS
Are secreted mainly by the ovaries and in smaller amounts by the adrenal glands and (in men) by the testes.
ESTROGENS
The most potent estrogen
ESTRADIOL
This hormone has a similar function similarly to androgens in men, the estrogens promote the development and maintenance of the primary and secondary female sexual characteristics; they also stimulate linear growth and skeletal maturation.
ESTRADIOL
Are the other type of female sex hormone and are named for their role in maintaining pregnancy (pro-gestation).
PROGESTINS, most important of which is PROGESTERONE
These are secreted cyclically during menstruation.
ESTROGENS AND PROGESTINS
During the menstrual cycle, the ____ of the ovary produces progesterone, which renders the uterine lining receptive to the implantation of a fertilized ovum.
RUPTURED OVARIAN FOLLICLE (CORPUS LUTEUM)
These hormones are produced in the adrenal cortex. They are mainly adrenocortical hormones, which basically divided to two
ADRENAL CORTEX HORMONES
Adrenal Cortex Hormones are produced in the adrenal cortex. They are mainly adrenocortical hormones, which basically divided to two:
GLUCOCORTICOIDS
MINERALOCORTICOIDS
It consist of hormones such as cortisol which mainly control and influence many metabolic processes like deposition of glycogen in the liver and the formation of glucose from amino acids and fatty acids.
GLUCOCORTICOIDS
It also helps in the maintenance of normal blood pressure, and also possessed anti-inflammatory and immunosuppressive actions, which are useful in treating rheumatoid arthritis and prevents the rejection of transplanted organs.
GLUCOCORTICOIDS
Like aldosterone, help maintain the balance between salts and water in the body and the predominantly exerts their effects within the kidney.
MINERALOCORTICOIDS
It is an endocrine gland that is only present during pregnancy.
PLACENTA
The placenta produces two steroid hormones:
ESTROGEN
PROGESTERONE
The placenta also releases several protein hormones:
▪ Human chorionic gonadotrophin (hCG)
▪ Human Placental Lactogen (hPL)
▪ Placental growth Hormone
▪ Relaxin
▪ Kisspeptin
These are group of lipophilic hormones that are usually derived from cholesterol (except T3 and T4).
GROUP I HORMONES
These hormones usually bind to intracellular receptors thereby forming hormone-receptor complex.
GROUP I HORMONES
They are mostly found in general circulation in association with transport proteins however they have relatively longer half-lives in hours or days.
GROUP I HORMONES
Examples of G1 hormones
T3, T4, Estrogen, Progesterone and Testosterone
These are hormones that bind to cell surface (plasma membrane) receptor before they stimulate the release of certain molecules known as second messenger which will then perform the biochemical function of these hormones.
GROUP II HORMONES
These hormones are transported in free form and they usually possess short half-lives in minutes.
GROUP II HORMONES
Group II are further subdivided into 3 categories based on the chemical nature of the second messenger:
- Camp - ACTH, FSH, LH;
- Phospholipid/inositol/Ca2+ - TRH, GnRH, Gastrin
- Unknown - Insulin STH, LTH, Oxytocin
These hormones have a specific local effect through paracrine secretion.
LOCAL HORMONES
Ex of Local Hormones
Hormone testosterone
These are hormones transported through circulation to the distal target tissue/organ.
GENERAL HORMONES
Ex of General Hormones
Thyroid Hormones and Insulin
These hormones may cause muscle contraction, pigment migration, glandular secretion and others.
KINETIC HORMONES
Ex of Kinetic Hormone
EPINEPHRINE
These are hormones that mainly caused changes in the rate of metabolism and balance the reaction.
METABOLIC HORMONES
Ex of Metabolic Hormones
Insulin, Glucagon, Parathyroid hormones
These are hormones that mainly involved in growth and differentiation in the body.
MORPHOGENETIC HORMONES
Ex of Morphogenetic hormones
Follicle stimulating hormones
Luteinizing hormones
Thyroid hormones
These are hormones that stimulate other endocrine gland for secretion.
TROPIC HORMONES
These are hormones that usually exert their effect on non-endocrine target tissues.
NONTROPIC HORMONES
Is the production of no hormone or too little of a hormone. It can be caused by the destruction of hormone-secreting cells, such as in Type 1 diabetes, or by a deficiency in a nutrient that is important for hormone synthesis.
HYPOSECRETION OF HORMONES
It is when an excess of one or more hormone is secreted from a gland.
HYPOSECRETION OF HORMONES
Hyposecretion Clinical Disorders
Dwarfism and unattained growth potential.
Hyposecretion symptoms
Slow or flat rate of growth in children
Changes in muscle mass, cholesterol levels, and bone strength
in adults.
Hyposecretion treatment
Hormone-replacement Therapy
Happens when the body produces too much of a hormone.
HYPERSECRETION OF HORMONES
A hormone can be hypersecreted if the gland develops a tumor and grows out of control or if the gland is signaled to produce too much of a hormone.
It is when the amount of hormones are released is too low. There are many types of disorders that can result when too much or too little of a hormone is released.
HYPERSECRETION OF HORMONES
Hypersecretion symptoms
Gigantism
Acromegaly
Hypersecretion treatment
Lower the production of GH
Medication
Surgery
Injection medications such as _____ can help manage hormone levels.
Somatostatin analogs (Sandostatin)