During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is:

(a) carbon dioxide
(b) alcohol
(c) lactose
(d) lactic acid

Question

During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is:
 
(a)	carbon dioxide
(b)	alcohol
(c)	lactose
(d)	lactic acid

MyClass24 · Accepted Answer

lactic acid

The anaerobic respiration by the muscles brings about a partial breakdown of glucose to form lactic acid.

During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is: (a) carbon dioxide (b) alcohol (c) lactose (d) lactic acid