Course Hero Logo

Decrease hormone regulation july 2018 bios256 midterm

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 4 - 6 out of 12 pages.

Decrease.Hormone regulationJuly 2018
BIOS256 Midterm Study GuideTYPE OFREGULATIONMAJOR STIMULUSMECHANISM AND SITE OFACTIONEFFECTON GFRAngiotensin IIDecreased blood volume or bloodpressure stimulates production ofangiotensin II.Constriction of afferent and efferentarterioles.Decrease.Atrial natriureticpeptide (ANP)Stretching of atria of heartstimulates secretion of ANP.Relaxation of mesangial cells inglomerulus increases capillarysurface area available for filtration.Increase.(Ch. 26) Tubular reabsorption and secretion(Ch. 26) Table 26.4HORMONEMAJOR STIMULI THATTRIGGER RELEASEMECHANISM AND SITEOF ACTIONEFFECTSAngiotensinIILow blood volume or lowblood pressure stimulatesrenin-induced productionof angiotensin II.Stimulates activity of Na+H+antiporters in proximaltubule cells.Increases reabsorption ofNa+, other solutes, andwater, which increasesblood volume and bloodpressure.AldosteroneIncreased angiotensin IIlevel and increased levelof plasma K+promoterelease of aldosterone byadrenal cortex.Enhances activity of sodium–potassium pumps inbasolateral membrane andNa+channels in apicalmembrane of principal cellsin collecting duct.Increases secretion ofK+and reabsorption ofNa+, Cl; increasesreabsorption of water,which increases bloodvolume and bloodpressure.Antidiuretichormone(ADH)Increased osmolarity ofextracellular fluid ordecreased blood volumepromotes release of ADHfrom posterior pituitarygland.Stimulates insertion of waterchannel proteins (aquaporin-2) into apical membranes ofprincipal cells.Increases facultativereabsorption of water,which decreasesosmolarity of body fluids.Atrialnatriureticpeptide (ANP)Stretching of atria ofheart stimulates ANPsecretion.Suppresses reabsorption ofNa+and water in proximaltubule and collecting duct;inhibits secretion ofaldosterone and ADH.Increases excretion ofNa+in urine (natriuresis);increases urine output(diuresis) and thusdecreases blood volumeand blood pressure.Parathyroidhormone(PTH)Decreased level ofplasma Ca2+promotesrelease of PTH fromparathyroid glands.Stimulates opening ofCa2+channels in apicalmembranes of early distaltubule cells.Increases reabsorption ofCa2+.(Ch. 26) Formation of concentrated urine(Ch. 26) Evaluation of kidney functionShort Answer Questions

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 12 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
N/A
Tags
Myenteric plexus full

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture