BIO210Y5 Lecture Notes - Lecture 21: Nephron, Posterior Pituitary, Aldosterone
Document Summary
The adh is key to adding more water to the ecf because you have too many salts in your ecf. The adh causes water to be reabsorbed from the collecting duct. Producing highly concentrated urine but a larger volume of it. You"re also feeling thirst need to get more water in your system. Stimulating aldosterone to move salts with the movement of water. You don"t want to lose too much sodium so aldosterone reabsorbs. Increasing blood pressure and blood volume because you"re increasing volume of ecf blood vessel distension (making them larger) We lose the salts through the kidneys or secretions. Some are also lost through feces (like calcium) You are stimulating sodium reabsorption and potassium excretion. You also have potassium leak channels so your tendency is already to lose potassium to the environment. The aldosterone pump adds another mechanism through which the potassium is lost but for an increase in sodium.
