Organs of the - PowerPoint Presentation

Slide1

Organs of the Endocrine System

a

nd

R

elated HormonesSlide2

Hypothalamus

Collects information from the body. Integrates the nervous system and Endocrine system responses to maintain homeostasis.

Hormones:

Hypothalamic Releasing Hormone

and Hypothalamic

Non-releasing Hormone



stimulate or inhibit the pituitary gland.Slide3

Pituitary

Two parts: Anterior Pituitary and Posterior Pituitary

Can act directly on target tissue or stimulate other endocrine glands.

Hormones Anterior Pituitary:

Tropic Hormones, stimulate other endocrine glands.

Adrenocorticotropin

(ACTH)



Stimulates the adrenal cortex to release steroid hormones.

Thyroid-stimulating hormone (TSH)



acts on the thyroid to stimulates the release of two thyroid hormones

thyroxine

(T

4

) and

triiodothyronine

(T

3

).Slide4

Anterior pituitary: Tropins continued

Follicle-stimulating hormone (FSH)



stimulates the production of estrogen and eggs in women, and production of sperm in men.

Luteinizing hormone (LH)



acts on ovaries to produce progesterone an estrogen in women. Also signals the release of eggs. In men stimulates the interstitial cells in the testes to produce testosterone. Slide5

Anterior pituitary: Other Hormones

Stores and releases hormones from the hypothalamus.

Growth hormone (GH)



acts directly on body tissues. Responsible for the growth and development of the body. Also important in the breakdown of fats and proteins into useable energy, during exercise.

Prolactin



stimulates the growth of the mammary glands and milk production in a nursing mother

.

https://www.youtube.com/watch?v=2ALEMLZKnfASlide6

Posterior Pituitary

Hormones of the Posterior Pituitary

, the posterior pituitary stores rather than produces hormones:

Antidiuretic hormone



targets the kidneys, decreases urine output, increasing fluid volume in the body.

Secreted when plasma volume (the liquid portion of the blood) gets low due to dehydration or profuse sweating.

Subject to humoral control.

Also plays a role in controlling blood pressure.

Oxytocin



secreted by pregnant women during labor and continues to be secreted for as long as the woman is nursing.Slide7
Slide8

Thyroid

Located near the larynx, controls metabolism.

Hormones of the Thyroid

:

Thyroid hormone:

Thyroxine

(T

4

) and

Triiodothryonine

(T

3

)



Responsible for controlling energy metabolism and heat production of the body

.

Calcitonin

 when calcium levels in the blood rise, calcitonin is released to facilitate uptake of calcium by the bones. It also reduces absorption of calcium by the kidneys and intestines.

Subject to humoral control

Produced mostly during childhood. Slide9

Parathyroid

Two

pairs of glands located on the posterior of the thyroid.

Hormone

:

Parathyroid hormone (PTH)



secreted in response to low blood calcium.

Stimulates the breakdown of bone tissues, which releases calcium into the blood.

Increases absorption of calcium in the intestines with the aid of vitamin D

Stimulates reabsorption of calcium from the kidneys.Slide10

Thymus and Pineal Gland

Thymus

Both an endocrine gland and a lymphatic organ. It grows smaller with age. Inhibited by cortisol production.

Hormone

:

Thymosin



essential for the development of white blood cells. Which plays an important role in the body’s immune system

.

Pineal Gland

Small gland located in the brain and contains the

epithalamus

.

Hormone

:

Melatonin



produced when the body is exposed to darkness, causes sleepiness. Slide11

Adrenal

Glands: Adrenal medulla

A

pair of glands that sit on top of the kidneys.

Two parts: the adrenal cortex and the adrenal medulla.

The adrenal cortex functions as a gland

The adrenal medulla is part of the nervous system.

Hormones of the Adrenal Medulla

:

epinephrine (adrenalin)

and

norepinephrine



stimulated into production by the sympathetic nervous system, during physical and emotional stress. Increased breathing, heart rate, blood pressure. Change in blood flow to redistribute resources to the muscles.Slide12

Adrenal Cortex

Hormones of the Adrenal Cortex

, stimulated through hormonal control by the anterior pituitary:

Mineralocorticoids, regulate sodium:

Aldosterone



stimulate the reabsorption of sodium and water by the kidneys and the elimination of potassium. Major role in regulating blood pressure and blood electrolyte concentrations.

Glucocorticoids, regulate sugar:

Cortisone

and

Cortiso

l



converts fats and amino acids into glucose. This insures the brain and nervous system always has a constant supply of glucose.

Sex Hormones:

Estrogen

and

Androgens

, primarily

testosterone



released in small amounts but steadily throughout life. Slide13

Pancreas

Regulates

blood sugar levels in the blood.

Hormones:

Insulin



causes the body’s cells to take up glucose for energy use which reduces blood glucose. Stimulates the liver to convert excess glucose into glycogen.

Glucagon



increases blood glucose by stimulating the liver to begin braking down glycogen into glucose.Slide14

Gonads

Sex

glands, testes in men, ovaries in women.

Hormones:

Testosterone



produced by the testes, responsible for sperm production, development of the male reproductive system and the emergence of male secondary sexual characteristics during puberty.

Estrogen

and

progesterone



development of the female reproductive glands and secondary sexual characteristics. Regulates the menstrual cycle and promotes breast development. Slide15

Other Hormones

Some

hormones are actually produced by the tissues rather than endocrine glands.

Erythropoietin



released by the kidneys, stimulates red blood cell production.

Prostaglandins



released by fatty tissue, regulates smooth muscle cells, and activates the inflammatory response.

Leptin



released by adipose tissue, fatty tissue, reduces appetite and increases energy production.Slide16