TBL 2: potassium

Question 1

potassium is the cell’s major __ cation

Answer 1

potassium is the cell’s major intracellular cation

Question 2

__% of potassium is found intracellularly

Answer 2

98% of potassium is found intracellularly

Question 3

dietary sources of potassium

Answer 3

fruit and veg
legumes
nuts
dairy

Question 4

over __% of ingested potassium is absorbed

Answer 4

over 85% of ingested potassium is absorbed

Question 5

potassium absorption occurs mainly in __, some in __

Answer 5

potassium absorption occurs mainly in small intestine, some in colon

Question 6

depending on conc, sometimes potassium is absorbed by __ or __

Answer 6

depending on conc, sometimes potassium is absorbed by passive diffusion or actively by K/H+ ATPase

Question 7

potassium can also be absorbed in __ membranes by potassium channels

Answer 7

potassium can also be absorbed in brush border membranes by potassium channels

Question 8

plasma potassium conc is regulated by __ and __ functions

Answer 8

plasma potassium conc is regulated by hormonal and renal functions

Question 9

what hormones regulates potassium by promoting uptake by hepatic and muscle cells?

Answer 9

insulin

Question 10

very high IC potassium is maintained by

Answer 10

Na/K ATPase pumps

Question 11

dietary potassium in digestive tract also signals kidneys which,

Answer 11

increase urinary potassium excretion

Question 12

main role of potassium in cell

Answer 12

maintain resting membrane potential

Question 13

potassium excretion

Answer 13

mainly urine, some feces and sweat

Question 14

urinary potassium excretion is reduced with __ and lower __

Answer 14

urinary potassium excretion is reduced with lower intake (or diarrhea, vomiting and lower plasma conc

Question 15

recommended potassium

Answer 15

4,700 mg

Question 16

most common situation for potassium deficiency

Answer 16

profound loss of fluid and electrolytes (vomiting, diarrhea)

Question 17

what other deficiency promotes potassium excretion?

Answer 17

magnesium deficiency

Question 18

what causes magnesium deficiency?

Answer 18

thiazide
loop diuretics
glucocorticoids

Question 19

potassium deficiency is called

Answer 19

hypokalemia

Question 20

hypokalemia symptoms

Answer 20

muscle weakness
lethargy
ascending paralysis
cardiac arrythmias
death

Question 21

hyperkalemia

Answer 21

causes heart issues
renal failure

Question 22

hypokalemia and hyperkalemia mainly mess with

Answer 22

resting membrane potential