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

Open in App

Solution

(d) lactic acid
During a marathon, most of the energy in our muscles is produced through aerobic respiration, while anaerobic respiration provides some extra energy needed under these conditions. The anaerobic respiration by the muscles brings about partial breakdown of glucose to form lactic acid. The accumulation of lactic acid in the muscles causes muscle cramps.

Suggest Corrections

Similar questions

Question 5 (b)
Tick the correct answer:
(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water

Q. A person gets cramps in the legs during marathon (a long distance race).
(a) Name the chemical whose accumulation in his leg muscles produces cramps.
(b) What type of respiration produces this chemical?
(c) How can the person get relief from cramps in muscles caused during marathon?

Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to :
(a) ethanol
(b) carbon dioxide
(c) acetic acid
(d) lactic acid

Question 1
Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

(a) Alcohol and lactic acid
(b) Alcohol and $C O_{2}$
(c) Lactic acid and $C O_{2}$
(d) Lactic acid only

Which of the following statements about the mechanism of muscle contraction are correct?

A. Acetylcholine is released when the neural signal reaches the motor end plate.

B. Muscle contraction is initiated by a signal sent by CNS via a sensory neuron.

C. During muscle contraction, the isotropic band gets elongated.

D. Repeated activation of the muscle can lead to accumulation of lactic acid.

Join BYJU'S Learning Program

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

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