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Endocrine Physiology

Endocrine Physiology. Introduction to Endocrine Principles. There are TWO major groups of hormones. Peptide and protein hormones. Amine hormones. Peptide and protein hormones act through cell membrane receptors. Peptide and protein hormones act through generation of second messengers.

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Endocrine Physiology

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  1. Endocrine Physiology Introduction to Endocrine Principles There are TWO major groups of hormones Peptide and protein hormones Amine hormones Peptide and protein hormones act through cell membrane receptors Peptide and protein hormones act through generation of second messengers Steroid hormones and Lypophyllic hormones Mechanism of action of Steroid hormones Synthesis, Storage, and Release of Hormones Types of Endocrine glands and cells

  2. Control of Endocrine Systems AXIS: One endocrine gland acting on another endocrine gland The vertebrate pituitary gland hormonal and neural mechanisms that modulate the action of the HPA (Hypot-pituit-adrenal) AXIS synergism and antagonism among hormones The mammalian stress response phases The mammalian stress response and blood losses Endocrine control of salt and Water Balance The renin–angiotensin–aldosterone system

  3. Muscle and Movement The organization of skeletal muscles Excitation–contraction coupling Whole Skeletal Muscles contractions Muscle Energetic

  4. The molecular bases of movement The organization of skeletal muscles The Contractile proteins Muscle contraction produced by sliding filaments (sliding-filament theory) Molecular interactions that underlie muscle contraction Regulation of contraction by Ca2+ and regulatory proteins Excitation–contraction coupling Interaction between contractile and elastic components Whole Skeletal Muscles: Isometric and isotonic contractions Summation and tetanus The relationship between length and tension produced by skeletal muscle Work done by a muscle during contraction

  5. MUSCLE ENERGETICS: The production and use of ATP The mechanisms of meeting the ATP costs running Neural control of skeletal muscle

  6. Respiration Properties and Transport of gases External respiration and Ventilation Breathing in Vertebrates and Invertebrates

  7. Properties of gases: the total pressure exerted by a mixture of gases Temperature and salinity decrease gas solubility in solutions Transport of Gases convective gas transport Gas transport occurs by alternating convection and diffusion The oxygen cascade The physical properties of air and water affect respiration

  8. External respiration andVentilation EXTERNAL RESPIRATION: Generalized features of animal gas exchange different types of respiratory structures Oxygen transfer from the environmental medium to the blood Vertebrate Breathing Total area and thickness of the gas-exchange membrane in the gills or lungs Respiration and Water balance in terrestrial organisms Role of skin on O2 and CO2 exchange The branchial breathing system in teleost fish Breathing in teleost fish, Regulation of Breathing in fish Breathing organs of amphibians and reptiles The airways in mammals

  9. Dynamic lung volumes in healthy young adult men Mechanisms of gas transport in final branches of mammalian lungs during inhalation the lungs and air sacs of birds Airflow in the lungs and air sacs of birds insect breathing tracheal system Insect oxygen cascades assuming oxygen transport by diffusion

  10. Circulation Transport of oxygen and carbon dioxide in body fluids Circulation and Hearts Circulation in vertebrates and invertebrates

  11. Respiratory pigments Increase the amount of oxygen carried by blood Respiratory pigments undergo reversible combination with O2 Typical oxygen equilibrium curves for human arterial blood Oxygen delivery by human blood at rest and during vigorous exercise The diversity of blood oxygen equilibrium curves and their ecological meaning The Bohr effect: decrease in pH or increase on CO2 decrease affinity for O2 Carbon dioxide equilibrium curves Processes of CO2 uptake by the blood in a systemic blood capillary of a vertebrate The extent of CO2 transport depends on blood buffers

  12. Processes of CO2 uptake by the blood in a systemic blood capillary of a vertebrate The heart as a pump Circulation The conducting system and the process of conduction in the mammalian heart (MYOGENIC) Parasympathetic and sympathetic control of circulation rates Blood pressure and blood flow Vascular system structure and function Blood flow in the human systemic vasculature Closed circulatory system Pulmonary circuit properties and function Open circulatory system of insect and crustacean

  13. Water and Salt Physiology Body fluids Introduction to water-salt physiology

  14. Osmotic, ionic and volume regulation and conformity There are three major types of body fluids Osmotic regulation: maintenance of a steady osmotic pressure. Ionic regulation : maintenance of steady concentrations of ions. Volume regulation: maintenance of steady volume of water. Importance of ions and water in physiology Water-Salt in natural aquatic environments Terrestrial environments: humidity, evaporation and Saturation water vapor pressure Factor important in evaporation Organs of osmoregulation of blood : kidneys, gills, gland salts

  15. The Urine/Plasma radio How Organismsgainwater Metabolic water The fundamental principles of cell-volume regulation, role of organic molecules Osmotic pressures of sea, fresh water and terrestrial organisms. How are they maintained?

  16. Water and Salt Physiology Animals in Fresh water Animals in the ocean Animals that face changes in salinity Animals on terrestrial habitats Water-Salt in natural aquatic environments

  17. Water–salt relations in a freshwater animal Water-Salt regulation in freshwater animals ADAPTATIONS:Active ion transport uptake across gill epithelium of a freshwater fish Water–salt relations in freshwater fish

  18. Water-Salt regulation in MarineInvertebrates Water–salt relations in marine teleost fish NaCl secretion by a chloride cell of a marine teleost fish Birds in ocean environments: salt glands of a herring gull Water–salt relations in a marine shark UREA and Trimethylamine oxide (TMAO) Animals from brackish water Acclimation to changed salinity

  19. Terrestrial environments Terrestrial organisms lose water by evaporation Humidic and Xeric animals Low integumentary permeability to water reduces evaporative water loss Respiratory evaporative loss depends on the function of the breathing organs The temperature of air exhaled from the nostrils evaporative loss and size. Excretory water loss depends on the concentrating ability of excretory organs Water-turnover rates of free-living terrestrial vertebrates as a function of body size Amphibians occupy xeric habitats despite their humidic nature: ADAPTATIONS Insects are excellent water managers, WHY? Xeric vertebrates are well adapted to prevent water losses.

  20. Excretion Basic mechanisms of Kidney function Urine formation in Amphibians Urine formation in Mammals Urine formation in Insects Nitrogen balance

  21. Kidneys Basic mechanisms of Kidney function Formation of primary urine by ULTRAFILTRATION OR active solute secretion Urine formation in amphibians during diuresis and antidiuresis The action of an antidiuretic hormone (ADH) Aquaporin Urine formation in mammals ANATOMY explains PHYSIOLOGY Evolutionary development of renal papilla in mammals native to different habitats Maximum urine concentrationcorrelates with the relative thickness of the medulla

  22. Countercurrent multiplication is the key to produce concentrated urine Osmotic pressure increases with depth in the medulla The single effect Countercurrent multiplication in the loop of Henle Major molecular mechanisms of NaCl reabsorption and associated processes Role of Malpighian tubules and hindgut of an insect in excretion nitrogenous compounds excreted by animals

  23. Next 5 slides might be optional if we do not cover these topics in the last class. • If you know these concepts you might be able to answer some additional integrative questions

  24. Integrative questions: Environmental physiology Challenges and Adaptations Terrestrial Sea water Fresh water

  25. Marine life Marine life Different ecological niches Pelagic: floaters, drifters, swimmers Bentos: bottom dwellers Pelagic organisms Plankton- floaters and drifters Nekton- free swimmers Feeding and nutrition in the ocean metabolism in marine vertebrate and invertebrate Sea Temperature and thermoregulation Movement and flotation

  26. Respiration in the sea The physical properties of water affect respiration Water more dense: more energy to move it (ventilation) A water-breathing animals must work much harder to obtain oxygen! Water–salt relations in marine organisms Senses in the ocean: photoreceptive structures Senses in the ocean: mechanical senses

  27. Terrestrial life The properties of air mean that to succeed on land animals need: Terrestrial biomes Primary productivity and distribution of animals Categories of terrestrial animals Thermal adaptations Problems and advantages of life on land Nutrition and metabolism movement Communications:

  28. Fresh water • Physical features, challenges and advantages Osmoregulation: Thermoregulation: Respiration Reproduction

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