hemoglobin and myoglobin

Question 1

muscles have two sources of

Answer 1

oxygen

Question 2

hemoglobin

Answer 2

blood delivers continuous supply of oxygen from the lungs on hemoglobin in RBCs

Question 3

myoglobin

Answer 3

a protein within muscle fibers

Question 4

fx of myoglobin

Answer 4

to store some oxygen

Question 5

both hemoglobin and myoglobin contain the mineral

Answer 5

iron

Question 6

iron enables

Answer 6

hemoglobin and myoglobin to bind oxygen

Question 7

iron makes both molecules

Answer 7

red

Question 8

iron in hemoglobin

Answer 8

makes blood red

Question 9

iron in myoglobin

Answer 9

gives muscle tissue a red or dark color

Question 10

oxygen stored in myoglobin is quickly used up

Answer 10

during strenuous exercise

Question 11

circulation may not deliver oxygen fast enough to permit the completion of aerobic cell respiration during

Answer 11

strenuous exercise

Question 12

even though the RR increases

Answer 12

muscle fibers run out of oxygen, causing oxygen debt

Question 13

in the state of oxygen debt

Answer 13

oxygen cannot be completely broken down into C02 and H20

Question 14

as oxygen not present in cell respiration

Answer 14

process becomes anaerobic and glucose is converted to lactic acid

Question 15

lactic acid

Answer 15

lowers pH of intracellular fluid and causes muscle fatigue

Question 16

during muscle fatigue

Answer 16

muscle fibers cannot contract efficiently, contraction may become painful, and lactic acid from muscle enters blood and circulates to liver where it is converted to pyruvic acid (3 carbohydrate) that can later be used for energy

Question 17

conversion of lactic acid to pyruvic acid requires

Answer 17

ATP and oxygen is needed to produce the ATP in the liver

Question 18

recovery oxygen uptake

Answer 18

after strenuous activity the RR and HR remain high for a time and only gradually return to normal.

Question 19

during oxygen uptake

Answer 19

there is faster and deeper RR