Biology has the highest weightage for the NEET examination when compared to the other two subjects. Breathing and the exchange of gases are essential topics in biology that require major preparation. Here in this blog, we are sharing important notes, video lectures and previous year questions with detailed solutions.

Breathing and Exchange of Gases

 Living beings require energy to carry out many activities. This energy is obtained through the breakdown of numerous dietary components, such as proteins, carbs, lipids, and so on. Catabolic activities require oxygen, and carbon dioxide is produced as a byproduct. As a result, the body requires a continual exchange of gases, with oxygen from the environment being taken in and carbon dioxide created being expelled. This process of gas exchange is referred to as breathing or respiration.


It is an involuntary catabolic process that involves the exchange of oxygen from the environment and carbon dioxide from the body. The oxygen is used in the mitochondria to make energy by oxidising glucose.

Three Steps of Respiration

Pulmonary Ventilation

The first process is pulmonary ventilation, often known as breathing, which is the inspiration and expiration of air between the atmosphere and the lungs.

External Respiration

This is the exchange of gases between the lungs’ air spaces and blood in the pulmonary capillaries. The blood acquires Oxygen while losing Carbon Dioxide.

Internal Respiration

Internal respiration refers to the exchange of gases between blood in systemic capillaries and tissue cells. Within cells, the blood loses Oxygen and acquires Carbon Dioxide.

Types of Respiration

  1. Aerobic Respiration: It takes place in the presence of molecular oxygen. The oxygen totally oxidises the food, producing a great amount of energy in the process.
  2. Anaerobic Respiration: It is also known as fermentation when it happens in the absence of molecular oxygen. The food is partially oxidised in this process, so only a portion of the energy is released, and some of the energy stays trapped in the intermediate molecules.

Learn Breathing and Exchange of Gases now

Video Lectures

This session will be conducted by Ms Swati Mittal, a subject matter expert in NEET Biology. She will brief the topic of Breathing and Exchange for NEET in simplified form. Different shortcuts and the best methods will be exclusively shared in this live class in order to boost the one-minute answering skill.

The next session is conducted by Dr Stuti Agarwal. She is an accomplished educator and mentor with years of NEET coaching experience. She goes into great detail regarding the topic Breathing and Exchange of Gases. There are three video sessions and do watch them all for thorough learning.

The next session is an exclusive lecture conducted by Mr Ajay Kumar. He discusses the important previous year questions from Breathing and Exchange of gases.

The next session by Dr Stuti Agarawal will be providing different tips to learn Breathing and Exchange of gases thoroughly.

Breathing and Exchange of Gases Previous Year Questions with Detailed Solutions

Basidia’s NEET special daily live classes for various subjects will be conducted 4 to 5 times a day with the vision of equipping you with the right knowledge to crack the NEET exam. The sessions are conducted live and the same will be uploaded as a video on our YouTube channel – NEET Live Classes Subscribe Now

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