ICSE Class 9: Mechanism of Breathing Videos | Respiration

• what do you understand by the term tidal volume
• Explain Asphyxiation and Hypoxia.  
• When we are breathing why do we sometimes take deep breaths and not normal ?
• On 1 page of Selina Concise Biology Revised Edition for Class IX it is mentioned that tissue respiration means the diffusion of gases and cellular respiration means chemical change occuring inside the cell. BUT on another page it is written that tissue respiration is a chemical process. Which is correct  ? Is tissue respiration a physical or a chemical process ?  What is the difference between cellular and tissue respiration ??  
• What is the benefit of residual volume of air in the respiratory process ?

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