Zusammenfassung der Ressource
Endocrine System
- Major Glands
- Pineal Body
- Melatonin - sleep-wake cycle, seasonal rhythms, light conditions.
- Pineal Body - Middle Area of the brain
- Hypothalamus
- Releasing, inhibiting hormones.affect the functions of the anterior pituitary gland.
- Oxytocin and Vasopressin - transported to the posterior pituitary for temporary storage.
- Hypothalamus - Lower Central Area of the brain
- Pituitary Gland (Hypophysis)
- Master Gland. Secretes a lot of hormones that influence other glands.
- Pituitary - Beneath the Hypothalamus
- Anterior Lobe
- Somatropin, Thyroid Stimulating Hormone, FHS, Adrenocorticotropic, Lutenizing, Prolactin
- Middle Lobe
- Melanocyte-stimulating Hormone - stimulates release of Melatonin
- Posterior Lobe
- Secretes hormones released by the hypothalamus.
- Oxytocin - regulates uterine contraction during childbirth.
- Vasopressin - antidiuretic, prevents waterloss from the body.
- Thyroid
- Thyroxine and Triiodothyronine - work together to regulate the body's mental and physical growth
- Calcitonin - Decreases blood calcium level
- Parathyroid
- Controls Ca within bones and blood.
- Parathyroid - 4 structures wrapped around the Thyroid.
- Thyroid - base of the neck, wrapped around the lateral side of the trachea.
- Andrenal Glands
- Glucocorticoids - increase of blood sugar and breakdown of proteins..
- Mineral Corticoids - regulates concentration of sodium, calcium, and water balance in blood.
- Androgens like testosterone - influence the development of male secondary sex characteristics.
- Adrenal Cortex
- Adrenal Cortex - Outer layer
- Adrenal Glands - top of the kidneys
- Adrenal Medulla
- Adrenaline or Epinepherine or noradrenaline or norepinepherine - improves fight-or-flight response.
- Adrenal Medulla - Inner Layer
- Pancreas
- Insulin - secreted by beta cells, lower blood sugar level.
- Glucagon - produced by alpha cells, raises blood sugar level.
- Islets of Langerhans
- Testes
- Angrogen Testosterone - controls growth and development of male sex organ and secondary sex characteristics.
- Ovaries
- Progesterone and Estrogen - stimulate growth of uterine lining
- Estrogen also deals with secondary female characteristics.
- Summary
- Chemically controls body processes through its
hormonal secretions.
- Hormones are directly secreted by the ductless glands directly into the bloodstream.
- Hormones are mostly made of proteins.
- Some hormones affect most tissues of the body; some only have one or a few targets.
- Some hormones affect other endocrine glands.
- Hormones act in very small amounts. Therefore is very sensitive to changes, even in the slightest increase or decrease.
- An increase or a decrease in normal hormone level indictes disorders with the endocrine system.
- Some hormones have antagonistic effects. Meaning their function contrasts with another.
- An example would be Insulin and Glucagon, which decreases and increases blood sugar, respectively.