1 / 22

Endocrine System

Endocrine System. SBI4U Nov 9. The Pituitary Gland: Master Gland Posterior Anterior. Anterior vs posterior pituitary lobe. Posterior (back lobe) : stores & releases hormones. Anterior (front lobe) : produces hormones . Thyroid Gland. Controlled by TSH T3+ T4 Calcitonin

emil
Download Presentation

Endocrine System

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Endocrine System SBI4U Nov 9

  2. The Pituitary Gland: Master GlandPosterior Anterior

  3. Anterior vs posterior pituitary lobe • Posterior (back lobe) : stores & releases hormones. • Anterior (front lobe) : produces hormones.

  4. Thyroid Gland • Controlled by TSH • T3+ T4 • Calcitonin • In liver T4 T3+I to become active.

  5. Thyroid disorders • Goiter • Graves’ disease

  6. Parathyroid Gland • 4 small glands • Secrete PTH • Need vitamin D for Calcium reabsorption. N.B: 2 anatagonistic hormones control Ca 2+ levels in blood

  7. Regulation of calcium levels through negative feedback control

  8. Ricket Disease -Vitamin D deficiency -Most frequent childhood disease.

  9. Acitvity- Questions

  10. Q2- Why do some people eat lots and gain no weight?

  11. Answer: The lower the thyroxine is released the slower blood sugar is used therefore the faster fat stores build up. These individuals secrete high levels of thyroxine which oxidize sugars and other nutrients at a faster rate. Food 60 % heat (these individuals feel very warm) 40% ATP production

  12. Q3- As a person ages growth hormone production decreases. Explain the link between growth hormone production and aging?

  13. As a person ages growth hormone (GH) production begins to decline therefore cellular and protein replacement is compromised.GH increases cell size in muscle cells & connective tissues by promoting protein synthesis and inhibiting protein degradation. As you age protein is often replaced by fat causing changes in body’s shape.

  14. Q4. A nuclear accident in Chernobyl caused the release of radioactive wastes in air. The effect of the problem is still unknown but the effect on children has been the most extreme. One of the most radioactive materials released was Iodine-131 which causes inflammation and can lead to cancer. Draw a feedback loop that shows how thyroxine levels might be affected.

  15. Increase in Iodine-131 levels-thyroid damagedthyroid cannot detect TSH levels T3+T4 production reduced low T4 levels do not turn off hypothalamus therefore increased production of TRHhypothalamus increases production of TRH anterior pituitary produces TSH thyroid cannot detect levels of TSH.

More Related