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Endocrine System

Endocrine System. Supplementary slides Biol 384N. INTERCELLULAR COMMUNICATION. Light Sound Smell Taste Touch. Other Brain Centers. Hippocampus. Sense Organs. Nervous System. [-]. Stimuli. [-]. [-]. Hypothalamus. Pituitary. [-]. [-]. Thyroid. Endocrine System. Nerves of the

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Endocrine System

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  1. Endocrine System Supplementary slides Biol 384N

  2. INTERCELLULAR COMMUNICATION Light Sound Smell Taste Touch Other Brain Centers Hippocampus Sense Organs Nervous System [-] Stimuli [-] [-] Hypothalamus Pituitary [-] [-] Thyroid Endocrine System Nerves of the CNS and ANS Gonads Adrenal Cortex [-] Thymus Gland Glucocorticoids Immune System Other Immune System Centers Thymosin From thymus [+] Interleukin-1

  3. Some Endocrine System Definitions A. Endocrine glands are ductless glands that release a product into the bloodstream for transport to body targets B. Exocrine glands (not shown) release their products through ducts onto the body surface or into the lumen of an organ

  4. Some Endocrine System Definitions (continued) C. Hormones are chemical signals produced by an endocrine gland that act at some distance from the gland D. Targets are organs, tissues or cells capable of responding to the hormone due to the presence of a receptor that binds the hormone

  5. Mechanism of Hormone Action – A. Gene Activation 1. This example is lipid soluble hormones (ex. Steroids) How can two different targets exhibit two different responses to the same hormone? 2. Response is slow (1 to many hours) 3. steps

  6. Mechanism of Hormone Action – B. Second Messengers 1. Protein and other hormones that cannot pass the plasma membrane 2. Rapid response, within minutes 3. steps

  7. Example of Negative Feedback Regulation in the Endocrine System – insulin’s control of blood glucose levels 3. Insulin secreting cells in the pancreas (in Islets of Langerhans) sense high glucose levels (i.e. serve as the sensor) and release insulin (i.e. serve as the central processor and send a chemical signal to body) 1. Eating due to low blood glucose/hunger leads to digestion and glucose absorption 2. Blood glucose (controlled variable) is elevated 4. Most body cellstake up glucose in response to insulin binding, serve as targets for the hormone and thus as effectors 5. Blood glucose levels return to normal and insulin release stops Fig. 26.7

  8. Types of dıabetes • Type 1:insulin dependentdiabetes • (IDDM) • Body stops producing insulin, produces less to regulate blood glucoselevel

  9. Types of dıabetes • Type 2 :non-insulin dependent diabetes mellitus • (NIDDM) • Body not able use insulin secreted by pancreas

  10. Causes ofdıabetes • Genetic factors • Stress and anxiety • High carbohydrate diet (fast carbs) • Obesity • Nutritional deficiency • Less physical activity or lack of exercise

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