Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

Select the sequence of steps in Respiration.

(A) Diffusion of gases (O₂ and CO₂) across alveolar membrane.

(B) Diffusion of O₂ and CO₂ between blood and tissues.

(C) Transport of gases by the blood

(D) Pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out.

(E) Utilisation of O₂ by the cells for catabolic reactions are resultant release of CO₂

Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : A person goes to high altitude and experiences "Altitude Sickness" with symptoms like breathing difficulty and heart palpitations.

Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct answer from the options given below :

Vital capacity of lung is ________.