During the deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in :

Which of the following is the correct sequence of air passage during inhalation?

Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to:

Which of the following statements are correct ?

(i) pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) fermentation takes place in the case of aerobic bacteria

(iii) fermentation takes place in mitochondria

(iv) fermentation is a form of anaerobic respiration

Which of the following statements are true about respiration?

(i) during inhalation, ribs move inward and diaphragm is raised.

(ii) the. gaseous exchange takes place in the alveoli.

(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.

(iv) alveoli increase surface area for the exchange of gases