The pH of lemon juice is 2, and the pH of orange juice is 4. Which of these is more acidic, and by how much? What does this mean?
Week 12 notes Physiology for test 6 11-9-15 Actions of Angiotensin II o It is a potent vasoconstrictor o In the kidneys, it constricts glomerular arterioles. This decreases the glomerular filtration rate (GFR), which in turn raises systemic arterial blood pressure. o Acts on the adrenal cortex, causing the release of aldosterone o Acts on the brain to increase the sense of thirst, and increase the desire for salt. > rise in blood pressure. o Increases the secretion of vasopressin and ACTH. No Aldosterone/Too much Aldosterone o No aldosterone: ~8% sodium lost in the urine o Too much aldosterone: complete sodium reabsorption Role of R-A-A system in disorders o Hypertension (high blood pressure)- can be caused by an abnormal increases in renin-angiotensin- aldosterone activity o Edema as a result of Heart failure-decrease cardiac output results in reduced blood pressure that triggers salt and fluid retention. In tissues not blood: water. Drugs that Effect Na+ Reabsorption o Diuretics-cause “diuresis”; increased urinary output, can act by blocking Na+ reabsorption and thus, water is lost with the Na+ o ACE inhibitors-block ACE and thus the conversion of ANG I and ANG II Transport maximum (Tm ) o The concentration of the substance that is just enough to achieve the maximum transport rate is called the tr