Physics Wallah

Breathing and Exchange of Gases NEET Notes 2026 PDF, Class Room Study Notes

Breathing and Exchange of Gases NEET Notes, Explore detailed Breathing and Exchange of Gases NEET notes. Understand key topics like respiration, breathing mechanisms, gas exchange, and disorders.
authorImageSoumya Tiwari20 Aug, 2025
Share

Share

Breathing and Exchange of Gases NEET Notes

Breathing and Exchange of Gases NEET Notes: Breathing and the exchange of gases are essential physiological processes that ensure the survival of organisms by providing oxygen for cellular metabolism and removing carbon dioxide, a waste product of cellular respiration. This topic is crucial for students preparing for the NEET 2026 exam , as it forms a significant part of the  NEET Biology syllabus.

Breathing involves inhaling oxygen from the environment and exhaling carbon dioxide, while gas exchange refers to the diffusion of oxygen and carbon dioxide across the respiratory membrane in the lungs and tissues. Knowledge of the respiratory system, its mechanisms, and the regulation of breathing are all critical areas that NEET candidates need to master to score well in the exam.

Also Check:

Breathing and Exchange of Gases NEET Notes Overview

The topic of Breathing and Exchange of Gases is crucial for NEET preparation as it forms an integral part of the biology syllabus. To master this topic, students should focus on understanding the anatomy of the respiratory system, including important structures like the alveoli, diaphragm, and bronchioles. Grasping the mechanisms of gas exchange, such as diffusion and the role of the diaphragm and intercostal muscles during inhalation and exhalation, is essential. Regularly revising past year questions (PYQs) helps familiarize students with the NEET exam pattern, while using flowcharts and tables can aid in organizing complex information related to respiration and its disorders.

Breathing and Exchange of Gases NEET Notes

Breathing and Exchange of Gases PDF for NEET

PW provides a detailed PDF for Breathing and Exchange of Gases Notes that is explained thoroughly. It typically provides a concise summary of all essential concepts, including the steps of breathing, types of respiration, and factors influencing gas exchange.

Download the PDF of Breathing and Exchange of Gases Notes for NEET

What is Breathing and Exchange of Gases?

Breathing refers to the physical process of inhaling oxygen and exhaling carbon dioxide, while gas exchange involves the diffusion of gases (oxygen and carbon dioxide) across membranes. In humans, this takes place in the alveoli of the lungs, where oxygen is transferred to the blood, and carbon dioxide is removed.

The steps involved are:

  • Inhalation: Air is drawn into the lungs, and oxygen diffuses into the blood.
  • Gas Exchange in Alveoli: Oxygen from the inhaled air moves into the blood, and carbon dioxide from the blood diffuses into the alveoli to be expelled during exhalation.
  • Transport of Gases: Oxygen is carried by hemoglobin in red blood cells to various tissues, and carbon dioxide is carried back to the lungs for removal.

Weightage of Breathing and Exchange of Gases NEET Notes - Last 5 Years

Breathing and Exchange of Gases NEET Notes consistently contributes significant marks to the biology section, with 2-3 questions appearing annually in the NEET exam. Its conceptual nature makes it a high-yield topic for aspirants.

Weightage Following Previous Year’s Trends (2021-2025)
Chapter Easy Medium Hard Total Average Q/yr Weightage
Breathing and Exchange of Gases 2 7 1 10 2.00 3.79%
NEET Chapter Wise Weightage 2026 for Zoology
Topics Weightage (%)
Breathing and Exchange of Gases 4%

Importance of Breathing and Exchange of Gases NEET Notes

Mastering this topic is important for the following reasons:

  • Foundational Knowledge: It provides essential understanding for advanced medical topics such as internal medicine, cardiology, and pulmonary care.
  • High Question Frequency: Regularly appearing in NEET, this topic forms the backbone of understanding the human respiratory system.
  • Interdisciplinary Application: Knowledge of breathing and gas exchange is applicable across various medical fields, especially in diagnosing and treating respiratory disorders.

Tips of Breathing and Exchange of Gases NEET Notes

To perform well in Breathing and Exchange of Gases NEET, consider the following tips

  • Focus on Diagrams: Understand the anatomy of the respiratory system and practice labeling important parts like the alveoli, diaphragm, and bronchioles.
  • Understand the Mechanisms: Learn how gases move through diffusion and how the diaphragm and intercostal muscles function during inhalation and exhalation.
  • Revise Past Questions: Solving previous years’ questions (PYQs) will help you understand the exam pattern and the types of questions likely to appear.
  • Use Flowcharts: Use flowcharts and tables to organize information about the steps of respiration, gas exchange, and disorders of breathing.
  • Practice with Timed Mock Tests : Simulate exam conditions to practice answering questions quickly and efficiently.
Start your NEET 2026 preparation with PW’s online coaching , designed to help you master the syllabus with interactive lessons and regular mock tests. Get access to comprehensive study materials and personalized guidance.
NEET Exam Important Links
NEET Syllabus NEET Biology Notes
NEET Eligibility Criteria NEET Exam Pattern
NEET Previous Year Question Papers NEET Biology Syllabus

Breathing and Exchange of Gases NEET Notes

What are the breathing and gas exchange steps?

Breathing involves inhalation (oxygen intake) and exhalation (carbon dioxide expulsion). Gas exchange occurs in alveoli where oxygen diffuses into the blood, and carbon dioxide diffuses out.

What are the four steps of breathing?

The four steps are pulmonary ventilation, external respiration (gas exchange in alveoli), transport of gases by blood, and internal respiration (gas exchange in tissues).

What is breathing in short notes?

Breathing is the mechanical process of air movement into and out of the lungs, enabling oxygen supply and carbon dioxide removal.

What is the gas exchange and the human breathing system?

Gas exchange refers to the diffusion of oxygen and carbon dioxide between alveoli and blood. The human breathing system comprises organs like the nasal cavity, trachea, bronchi, lungs, and diaphragm, working in coordination to facilitate respiration.
Popup Close ImagePopup Open Image
Talk to a counsellorHave doubts? Our support team will be happy to assist you!
Popup Image
Join 15 Million students on the app today!
Point IconLive & recorded classes available at ease
Point IconDashboard for progress tracking
Point IconMillions of practice questions at your fingertips
Download ButtonDownload Button
Banner Image
Banner Image
Free Learning Resources
Know about Physics Wallah
Physics Wallah is an Indian edtech platform that provides accessible & comprehensive learning experiences to students from Class 6th to postgraduate level. We also provide extensive NCERT solutions, sample paper, NEET, JEE Mains, BITSAT previous year papers & more such resources to students. Physics Wallah also caters to over 3.5 million registered students and over 78 lakh+ Youtube subscribers with 4.8 rating on its app.
We Stand Out because
We provide students with intensive courses with India’s qualified & experienced faculties & mentors. PW strives to make the learning experience comprehensive and accessible for students of all sections of society. We believe in empowering every single student who couldn't dream of a good career in engineering and medical field earlier.
Our Key Focus Areas
Physics Wallah's main focus is to make the learning experience as economical as possible for all students. With our affordable courses like Lakshya, Udaan and Arjuna and many others, we have been able to provide a platform for lakhs of aspirants. From providing Chemistry, Maths, Physics formula to giving e-books of eminent authors like RD Sharma, RS Aggarwal and Lakhmir Singh, PW focuses on every single student's need for preparation.
What Makes Us Different
Physics Wallah strives to develop a comprehensive pedagogical structure for students, where they get a state-of-the-art learning experience with study material and resources. Apart from catering students preparing for JEE Mains and NEET, PW also provides study material for each state board like Uttar Pradesh, Bihar, and others

Copyright © 2025 Physicswallah Limited All rights reserved.