Which of the following situations is likely to cause muscle cramps ?

Glucose

L e s s o x y g e n - ------ \to

Lactic Acid

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Glucose

O x y g e n - --- \to

Lactic acid

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Glucose

N o o x y g e n - ----- \to

Alcohol +

C O_{2}

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Glucose

O x y g e n - --- \to

C O_{2}

H_{2} O

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Solution

The correct option is A Glucose $L e s s o x y g e n - ------ \to$ Lactic Acid
During heavy exercise, there is a shortage of oxygen. In such a case, the muscles undergo anaerobic mode of respiration. In this type of anaerobic respiration, due to less oxygen being available, glucose is converted to lactic acid and energy. This lactic acid gets accumulated in the muscles and leads to muscle cramps.
Thus, the correct answer is option A.

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Q. When muscles begin converting glucose into lactic acid?

Question 33
Lack of oxygen in muscles often leads to cramps among cricketers. This happens due to

(a) Conversion of pyruvate to ethanol
(b) Conversion of pyruvate to glucose
(c) Non-conversion of glucose to pyruvate
(d) Conversion of pyruvate to lactic acid

Question 13
Which of the following is most appropriate for aerobic respiration?

(a) $G l u c o s e m i t o c h o n d r i a - ------- \to P y r u v a t e c y t o p l a s m - ----- \to C O_{2} + H_{2} O + E n e r g y$
(b) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O + E n e r g y$
(c) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e + E n e r g y m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O$
(d) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e + E n e r g y m i t o c h o n d r i a - ------- \to C O_{2} + H_{2} O + E n e r g y$

Q. What are the net ATPs that are synthesised when one molecule of glucose is fermented to alcohol or lactic acid?

Glucose partially breaks down into lactic acid in:

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