Question

In which activity lactic acid system
is activated :
(A) 400 mts. run
(B) 100 mts. run
(C) 10,000 mts run
(D) 20 km. walk​

Answer 1

Answer:

20 km is the right answer

Answer 2

(D) 20 km. walk​

In (D) 20 km. walk​ lactic acid system is activated.

The body uses the lactic acid system for energy during high-intensity activities that last less than two minutes, such as sprint races, or for the first 40 seconds or so of less intense exercise (before the aerobic metabolism is fully active). The respiratory chain can't keep up with the amount of hydrogen ions joining to make NADH, therefore it can't renew NAD+ fast enough.

#SPJ2