Physiology of blood pH

Question 1

What is the average blood pH?

Answer 1

7.4

Question 2

What type of blood is more acidic? venous or arterial?

Answer 2

venous

Question 3

What is the affect of acidosis on CNS, enzymes and k levels?

Answer 3

CNS depression
influences enzyme activity
increased H secretion = decreased K secretion

Question 4

What are the H sources from the body?

Answer 4

carbonic acid formation
inorganic acids produced during breakdown from nutrient
organic acids resulting from metabolism - ketoacids and lactoacids

Question 5

How do stong acids dissociate in solution?

Answer 5

completely

Question 6

How do weak acids dissociate in solution?

Answer 6

partially

Question 7

What does pK mean?

Answer 7

pH at which a reaction is at an equilibrium

Question 8

What is the most important physiological buffer?

Answer 8

CO2 - HCO3 buffer - look over in notes

Question 9

What is the role of H secretion by the tubule?

Answer 9

drives reabsorption of HCO3
forms acid phosphate
forms ammonium ion