the endocrine system n.
Skip this Video
Download Presentation
The Endocrine System

Loading in 2 Seconds...

play fullscreen
1 / 24

The Endocrine System - PowerPoint PPT Presentation

  • Uploaded on

The Endocrine System.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'The Endocrine System' - kamaria-gyasi

Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

The pituitary, or hypophysis, is a small gland about the size of a cherry. It is located in a saddlelike depression of the sphenoid bone just posterior to the point where the optic nerves cross. It is surrounded by bone except where it connects with the hypothalamus of the brain by a stalk called the infundibulum


The hormones produced in the anterior pituitary are not released until chemical messengers called releasing hormones arrive from the hypothalamus. These releasing hormones travel to the anterior pituitary by way of a special type of circulatory pathway called a portal system. By this circulatory “detour,” some of the blood that leaves the hypothalamus travels to capillaries in the anterior pituitary before returning to the heart. As the blood circulates through the capillaries, it delivers the hormones that stimulate the release of anterior pituitary secretions.

the master gland
The “Master Gland”
  • Regulates and controls activities of all other endocrine glands!
  • Located at the midpoint of the skull, roughly behind the eyes and very close to the major arteries & veins carrying blood to and from the vein (WHY??)
  • Made up of 3 sections: Anterior, Intermediate and Posterior Lobes
anterior lobe
Anterior Lobe
  • The front part of the pituitary gland
  • Hormones produced regulate metabolic activities of cells and stimulate other endocrine glands

Produces 6 different hormones:

  • Growth hormone (HGH)
  • Thyroid-Stimulating Hormone (TSH)
  • Adrenocorticotropic Hormone (ACTH)
  • Follicle-Stimulating Hormone (FSH)
  • Luteinizing Hormone (LH)
  • Prolactin (PRL)

Growth Hormone: also known as somatotropin or somatropin, is a peptide hormone that stimulates growth, cell reproduction and regeneration

  • Thyroid-Stimulating Hormone: (also known as TSH or thyrotropin) is a hormone that stimulates the thyroid gland to produce thyroxine , and then triiodothyronine which stimulates the metabolism of almost every tissue in the body

Adrenocorticotropic Hormone (ACTH): also known as corticotropin, is often produced in response to biological stress. Its principal effects are increased production and release of corticosteroids

  • ACTH is also related to the circadian rhythm in many organisms

Follicle-Stimulating Hormone: FSH regulates the development, growth, pubertal maturation, and reproductive processes of the body. FSH and luteinizing hormone (LH) act synergistically in reproduction. Specifically, an increase in FSH secretion by the anterior pituitary causes ovulation.


Luteinizing Hormone (LH): also known as lutropin. In females, an acute rise of LH ("LH surge") triggers ovulation and development of the corpus luteum. In males, it stimulates Leydig cell production of testosterone. It acts synergistically with FSH.

  • Prolactin(PRL): stimulates the mammary glands to produce milk (lactation), counteracts the effects of dopamine, linked to production of testosterone and estrogen
the thyroid gland
The Thyroid Gland
  • Produces hormones that regulate metabolism, body heat and growth
  • Located on the front of the neck, just below the larynx
  • Consists of 2 lobes, 1 on either side of the trachea
  • Produces Thyroxine which regulates the way cells release energy to create other substances such as protein
thyroid hormone thyroxine
Thyroid Hormone - Thyroxine
  • Overproduction: hyperthyroidism causes tiredness, anxiety, weight loss, diarrhea and intolerance to heat
  • Underproduction: hypothyroidism causes tiredness, dry skin, hair loss, weight gain, constipation and hypersensitivity to cold
parathyroid glands
Parathyroid Glands
  • Found on the lobes of the thyroid gland
  • Produces Parathyroid Hormone which regulates the body’s calcium and phosphorus balance
adrenal glands
Adrenal Glands

Consist of 2 parts:

  • Adrenal cortex (outer)
  • Adrenal medulla (inner)
adrenal cortex
Adrenal Cortex
  • Absolutely essential for life
  • Produces Aldosterone which inhibits the amount of sodium excreted in urine (a key part of regulating blood pressure and blood volume)
  • Also produces Hydrocortisone, Corticosteroneand Androgen which play a role in metabolizing fats, proteins and carbohydrates, as well as inhibiting inflammation of tissues
adrenal medulla
Adrenal Medulla
  • Secretes the hormone Epinephrine (adrenalin – the ‘fight or flight’ hormone) and Norepinephrine
  • Epinephrine increases heart rate, BP and respiration and suppresses digestion (WHY??)
  • Norepinephrine (noradrenalin) increases heart rate, blood flow to the brain and skeletal muscle, triggers the release of glucose from energy stores
the pancreas
The Pancreas
  • Part of both the endocrine and digestive systems
  • Located behind the stomach, attached to the small intestine by a duct that transports its digestive juices to the intestine

The Pancreas is the site of the Islets of Langerhans; endocrine cells within the pancreas that secrete 2 hormones essential for maintaining blood sugar levels:

  • Insulin –stimulates the liver to remove glucose from the blood and convert it into glycogen for storage, thus lowering blood sugar levels
  • Glucagon – stimulates the liver to convert glycogen into glucose and release it into the blood for use in the body’s cells, thus increasing blood sugar levels
the gonads
The Gonads
  • Ovaries in females and Testes in males
  • Hormones released by these glands are responsible for spermatogenesis and ovulation and the development and maintenance of secondary sex characteristics such as muscle & bone mass, body and facial hair
  • Controlled by the Pituitary Gland

The Ishihara Color Test is an example of a color perception test for red-green color deficiencies.

  • The test consists of a number of colored plates, called Ishihara plates, each of which contains a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number or shape clearly visible to those with normal color vision, and invisible, or difficult to see, to those with a red-green color vision defect, or the other way around.