Physiology 7

Question 1

give the equation for working out pH

Answer 1

log 1/[H+]

Question 2

the pH of arterial blood is higher than venous blood T or F

Answer 2

T

Question 3

what is the average pH of blood?

Answer 3

7.4

Question 4

an increase in H+ ions __ pH

Answer 4

reduces

Question 5

does acidosis or alkalosis cause overexcitement of the CNS?

Answer 5

alkalosis

Question 6

changes in H+ ion levels influence the levels of what ion?

Answer 6

K+

Question 7

how is H+ added to the body?

Answer 7

via carbonic acid formation
from breakdown of nutrients
from metabolism

Question 8

HA H+ + A-

if acid is added to this system, what way will equilibrium shift?

Answer 8

to the left (A- binds to the extra acid)

Question 9

HA H+ + A-

if a base is added to this system, what way will equilibrium shift?

Answer 9

to the right

Question 10

what is the henderson hasselbalch equation?

Answer 10

pH = pK + log [A-]/[HA]

Question 11

what enzyme catalyses the reaction of CO2 + H20?

Answer 11

carbonic anhydrase

Question 12

HCO3 is controlled by what organ?

Answer 12

kidneys

Question 13

pCO2 is controlled by what organ?

Answer 13

lungs

Question 14

how can the kidneys alter the level of HCO3 in the blood?

Answer 14

can add new bicarb to the blood

can reabsorb HCO3 back into the blood

Question 15

when HCO3 levels in the tubular fluid is low, what does H+ combine with?

Answer 15

phosphate

Question 16

how can you measure the level of acid phosphate in the body?

Answer 16

measure the conc of titratable acid in the urine

Question 17

what 2 molecules formed of new H+ ions in the kidney are responsible for “alkalising” the body when acid levels are high?

Answer 17

titratable acid

NH4