Acid-Base Balance - URINARY MECHANISM OF pH CONTROL

Question 1

What plays vital role in acid-base balance because kidneys can eliminate more H+ from body while reabsorbing more base when pH tends toward acid side and eliminate fewer H+ while reabsorbing less base when pH tends toward alkaline side

Answer 1

URINARY MECHANISM OF pH CONTROL

Question 2

What are Mechanisms that control urine pH? There are 2.

Answer 2

Secretion of H+ into urine

Secretion of NH3 (ammonia)

Question 3

When blood hydrogen ion concentration increases, distal tubules secrete more NH3, which combines with H+ of urine to form ammonium ion, which displaces basic ion (mainly sodium) from a salt; basic ion then reabsorbed back into blood in exchange for ammonium ion excreted. What is happening?

Answer 3

Secretion of NH3 (ammonia)

Question 4

When blood CO2, H2CO3, and H+ increase above normal, distal tubules secrete more H+ into urine to displace basic ion (mainly sodium) from a urine salt and then reabsorb Na+ into blood in exchange for the H+. What is happening?

Answer 4

Secretion of H+ into urine