1 / 9

Blood Pressure Regulation- Background info

Blood Pressure Regulation- Background info. Water will go where there are high concentrations of Salt Increase in water = increase in volume Increase in volume = increase in pressure. Blood Pressure regulation. 1) If Low Blood Pressure (BP) Juxtaglomerular Apparatus secretes renin.

reuel
Télécharger la présentation

Blood Pressure Regulation- Background info

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. Blood Pressure Regulation- Background info • Water will go where there are high concentrations of Salt • Increase in water = increase in volume • Increase in volume = increase in pressure

  2. Blood Pressure regulation • 1) If Low Blood Pressure (BP) • Juxtaglomerular Apparatus secretes renin

  3. Blood Pressure regulation • 1) If Low Blood Pressure (BP) Aldosterone • Renin is an enzyme that changes angiotensinogen into Angiotensin I • Angiotensin I is then converted into Angiotensin II • Angiotensin II stimulates the adrenal cortex to release aldosterone

  4. Blood Pressure regulation • 1) If Low Blood Pressure (BP) • Aldosterone promotes the excretion of K+ and the reabsorption of Na+ • The reabsorption of Na+ is followed by the reabsorption of H2O • Blood volume and blood pressure increase

  5. 16.3 Regulatory Functions of the Kidneys • 2) If High Blood Pressure (BP) Atrial naturietic hormone (ANH) • Another hormone regulating sodium • Secreted by right atrium of heart in response to stretching • Indicates increased blood volume • Inhibits renin secretion by juxtaglomerular apparatus • Inhibits aldosterone release • Promotes sodium excretion - natriuresis

  6. Juxtaglomerular Apparatus

  7. 16.3 Regulatory Functions of the Kidneys -3) Permeability of collecting duct is under hormonal control • Antidiuretic hormone (ADH) • `is released by the posterior pituitary gland (made by the hypothalamus) to regulate BP • In the presence of ADH, the collecting duct become more permeable to water • Water will leave the kidney and enter blood (↑BP) and a concentrated urine is produced • In the absence of ADH, the collecting duct become less permeable to water • Water will not leave the kidney and a dilute urine is produced

  8. 16.3 Regulatory Functions of the Kidneys • Diuretics • Increase flow of urine • Alcohol • Shuts off ADH (antidiuretic hormone) causing larger urine volumes • Dehydration causes hangover • Caffeine • Increases glomerular filtration rate • Decreases tubular reabsorption of sodium • Diuretic drugs • Many inhibit active transport of sodium at loop of the nephron

  9. Summary • Know the background info • Know the mechanisms of the 3 hormones that regulate blood pressure

More Related