Syllabus covered in the MSVgo app

Download MSVgo app now!

Chapter 10 – Respiration in Organisms

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:


Respiration in organisms is a chapter taught in class 7 that delves into the biology subject of science. Respiration in animals takes place through specialised cells called alveoli that form the respiratory system unit. You must have heard about the mitochondria that are a part of the cell. It is the powerhouse of the cell. To produce energy, it requires nutrients along with oxygen. Oxygen is vital for the body organs to perform any function. Energy is derived from food along with oxygen. The respiratory system helps a body to sustain and convert food into energy.

Breathing enables an organism to inhale oxygen and exhale carbon dioxide. Oxygen is required to convert the food that we eat into energy. The ATPs that are released after the conversion takes place in the presence of oxygen.

Cellular respiration is the interchange of cellular oxygen and carbon dioxide with the surroundings. The air that we breathe goes to finer parts of our body, such as cells. The mitochondrion is the site inside the cell where cellular respiration takes place. Oxygen is also responsible for releasing carbon dioxide from the cell when the oxygen interacts with the food.

Glucose and oxygen meet inside the mitochondria to release carbon dioxide and water to the surroundings. This carbon dioxide is carried away with the blood to the lungs.

We breathe out carbon dioxide released when the oxygen reacts with the carbohydrates present in the cell.

Breathing in and out is a continuous process that keeps happening all the time till we die. The heart needs the energy to keep pumping the blood across the body, and hence we need oxygen to convert the food to energy. Respiration starts when we take air from the nostrils from the surroundings. It moves to the lungs, where we have alveoli that exchange the gases from the blood. The chest that holds the lungs lay on a muscle sheet called the diaphragm. The ribs and diaphragm movement causes the breathing in and out phenomenon. When we breathe in air, the diaphragm moves down, which makes the ribs move outwards. While we are releasing air, the diaphragm moves back up and the ribs contract.

There are two kinds of respiration, namely aerobic respiration and anaerobic respiration. Let’s look at both in detail.

Aerobic Respiration: It takes place in the presence of oxygen and leads to the release of a high energy amount. Human beings are the best examples of aerobic respiration because we breathe in oxygen. The cells release carbon dioxide and water.

Anaerobic Respiration: It is a type of respiration that commonly happens in yeast and does not require oxygen. The respiration occurs in the absence of oxygen and results in the release of very low energy.  Human beings also undergo anaerobic respiration in certain conditions. The released product in the muscle cells that undergo anaerobic respiration is lactic acid, and yeast releases ethanol.

Other animals have a slightly different respiratory system when compared to humans. Although the primary function is similar to the human respiratory system, it exhales the surroundings’ gases. Let’s check that in some more details.

Breathing in cockroaches: They have a small opening called spiracles on their sides of the body. The trachea is the air tube that runs inside their body and opens up at the spiracles for exchanging gases. The trachea is connected to the various body cells where internal cellular respiration takes place.

Breathing in earthworms: Earthworms breathe through their slimy and moist skin. The air can pass through their skin. Similarly, frogs also can breathe through their skin, although they have lungs too.

Yes, plants also breathe through stomata that are pore openings on the backside of the leaves. The plants can also absorb oxygen from their roots. The central feature of plants is that all their parts can independently respire. You must have read that plants take carbon dioxide and release oxygen during the day.

Respiration in organisms is an essential phenomenon that deals with exchanging gases from the surroundings and the body. We have a dedicated respiratory system with a fundamental unit called alveoli that carries out the gas exchange process inside the body. It is situated in our lungs, where the blood takes the oxygen to the body’s different parts. Different organisms have different types of respiratory systems.

  1. What is respiration in living organisms?
    Respiration is a process of breathing in the oxygen that converts the food into energy inside the cells. Hence, respiration is an essential phenomenon to generate energy for our body.
  2. What are the 4 types of respiration?
    The four types of respiration are – breathing or ventilation, external respiration, internal respiration and cellular respiration.
  3. What are three different ways organisms respire?
    The three different ways through which organisms respire are internal respiration, cellular respiration and external respiration.
  4. Why do living organisms respire Class 7?
    Respiration is essential to exchange the gases from our body and bring in oxygen inside the body to generate energy from the food.
  5. What is the meaning of respiration?
    Respiration is a fundamental living process through which an organism exchanges gases from the air and the inside body.

You can check the MSVgo video learning app to know more about the respiratory system of other organisms.

High School Physics

  • Alternating Current
  • Atoms
  • Communication Systems
  • Current Electricity
  • Dual nature of Radiation and Matter
  • Electric Charges and Fields
  • Electricity
  • Electromagnetic Induction
  • Electromagnetic Waves
  • Electron Beams and Radioactivity
  • Electrons and Photons
  • Electrostatic Potential and Capacitance
  • Fluid Pressure
  • Force and Acceleration
  • Force And Laws Of Motion
  • Gravitation
  • Internal Energy
  • Kinetic Theory
  • Law of motion
  • Light – Reflection And Refraction
  • Magnetic Effects Of Electric Current
  • Magnetism and Matter
  • Management Of Natural Resources
  • Mechanical properties of Fluids
  • Mechanical properties of Solids
  • Motion
  • Motion in a plane
  • Motion in a straight line
  • Moving Charges and Magnetism
  • Nuclear Energy
  • Nuclei
  • Oscillations
  • Our Environment
  • Paths of Heat
  • Physical world
  • Ray optics and optical instruments
  • Semiconductor Devices
  • Semiconductor Electronics: Materials, Devices and Simple Circuits
  • Simple Machines
  • Sound
  • Sources Of Energy
  • Specific and Latent Heats
  • Spherical Mirrors
  • Static Electricity
  • Systems of Particles and Rotational motion
  • Thermal properties of matter
  • Thermodynamics
  • Units and Measurement
  • Vectors, Scalar Quantities and Elementary Calculus
  • Wave Optics
  • Waves
  • Work, Power and Energy

High School Chemistry

  • Acids, Bases and Salts
  • Alcohols, Phenols and Ethers
  • Aldehydes, Ketones and Carboxylic Acids
  • Aliphatic and Aromatic Hydrocarbons
  • Alkyl and Aryl Halides
  • Amines
  • Analytical Chemistry 
  • Atomic Structure
  • Atoms And Molecules
  • Basic concepts of Chemistry
  • Biomolecules
  • Carbon And Its Compounds
  • Carboxylic acids and Acid Derivatives
  • Chemical Bonding and Molecular Structures
  • Chemical Energetics
  • Chemical Equilibria
  • Chemical Kinetics
  • Chemical Reactions And Equations
  • Chemical Reactions and Their Mechanisms
  • Chemistry in Everyday Life
  • Chemistry of p-Block elements
  • Chemistry of Transition and Inner Transition
  • Classification of Elements
  • Coordination Compounds
  • Cyanide, Isocyanide, Nitro compounds and Amines
  • Electrochemistry
  • Electrolysis
  • Elements, Compounds and Mixtures
  • Environmental Chemistry
  • Equilibrium
  • Ethers and Carbonyl compounds
  • Haloalkanes and Haloarenes
  • Hydrocarbons
  • Hydrogen
  • Ideal solutions
  • Introduction to Organic Chemistry
  • Ionic equilibria
  • Matter
  • Matter Around Us
  • Matter In Our Surroundings
  • Metallurgy
  • Metals And Non-Metals
  • Mole Concept and Stoichiometry
  • Natural Resources
  • Organic Chemistry – Basic Principles
  • Periodic Classification of Elements
  • Physical and Chemical Changes
  • Physical and Chemical Properties of Water
  • Polymers
  • Preparation, Properties and Uses of Compounds
  • Principles and Processes of Isolation of Elements
  • Redox Reactions
  • Relative Molecular Mass and Mole
  • States of Matter
  • Structure Of The Atom
  • Study of Compounds
  • Study of Gas Laws
  • Study of Representative Elements
  • Surface Chemistry
  • The d-block and f-block elements
  • The Gaseous State
  • The p-Block Elements
  • The Periodic Table
  • The s-Block Elements
  • The Solid State
  • Thermodynamics

High School Biology

  • Absorption and Movement of Water in Plants
  • Adolescent Issues
  • Anatomy of Flowering Plants
  • Animal Kingdom
  • Bacteria and Fungi-Friends and Foe
  • Biodiversity and Conservation
  • Biofertilizers
  • Biological Classification
  • Biomedical Engineering
  • Biomolecules
  • Biotechnology and its Applications
  • Biotic Community
  • Body Fluids and Circulation
  • Breathing and Exchange of Gases
  • Cell – Unit of Life
  • Cell Cycle and Cell Division
  • Cell Division and Structure of Chromosomes
  • Cell Reproduction
  • Cellular Respiration
  • Chemical Coordination and Integration
  • Circulation
  • Control And Coordination
  • Crop Improvement
  • Digestion and Absorption
  • Diversity In Living Organisms
  • Ecosystem
  • Environmental Issues
  • Excretory Products and their Elimination
  • Flowering Plants
  • Genes and Chromosomes
  • Health and Diseases
  • Health and Its Significance
  • Heredity And Evolution
  • Heredity and Variation
  • How Do Organisms Reproduce?
  • Human Diseases
  • Human Eye And Colourful World
  • Human Health and Disease
  • Human Population
  • Human Reproduction
  • Hygiene
  • Improvement In Food Resources
  • Integumentary System- Skin
  • Kingdom Fungi
  • Kingdom Monera
  • Kingdom Protista
  • Life Processes
  • Locomotion and Movement
  • Microbes in Human Welfare
  • Mineral Nutrition
  • Molecular Basis of Inheritance
  • Morphology of Flowering Plants
  • Neural Control And Coordination
  • Nutrition in Human Beings
  • Organism and Population
  • Photosynthesis
  • Photosynthesis in Higher Plants
  • Plant Growth and Development
  • Plant Kingdom
  • Pollination and Fertilization
  • Pollution; Sources and its effects
  • Principles of Inheritance and Variation
  • Reproduction and Development in Angiosperms
  • Reproduction in Organisms
  • Reproductive Health
  • Respiration in Human Beings
  • Respiration in Plants
  • Respiratory System
  • Sexual Reproduction in Flowering Plants
  • Strategies for Enhancement in Food Production
  • Structural Organisation in Animals
  • Structural Organisation of the Cell
  • The Endocrine System
  • The Fundamental Unit Of Life
  • The Living World
  • The Nervous System and Sense Organs
  • Tissues
  • Transpiration
  • Transport in Plants

High School Math

  • Algebra – Arithmatic Progressions
  • Algebra – Complex Numbers and Quadratic Equations
  • Algebra – Linear Inequalities
  • Algebra – Pair of Linear Equations in Two Variables
  • Algebra – Polynomials
  • Algebra – Principle of Mathematical Induction
  • Algebra – Quadratic Equations
  • Binomial Theorem
  • Calculus – Applications of Derivatives
  • Calculus – Applications of the Integrals
  • Calculus – Continuity and Differentiability
  • Calculus – Differential Equations
  • Calculus – Integrals
  • Geometry – Area
  • Geometry – Circles
  • Geometry – Conic Sections
  • Geometry – Constructions
  • Geometry – Introduction to Euclid’s Geometry
  • Geometry – Three-dimensional Geometry
  • Geometry – Lines and Angles
  • Geometry – Quadrilaterals
  • Geometry – Straight Lines
  • Geometry – Triangles
  • Linear Programming
  • Matrices and Determinants
  • Mensuration – Areas
  • Mensuration – Surface Areas and Volumes
  • Number Systems
  • Number Systems – Real Numbers
  • Permutations and Combinations
  • Probability
  • Sequence and Series
  • Sets and Functions
  • Statistics 
  • Trignometry – Height and Distance
  • Trignometry – Identities
  • Trignometry – Introduction

Middle School Science

  • Acids, Bases And Salts
  • Air and Its Constituents
  • Basic Biology
  • Body Movements
  • Carbon and Its Compounds
  • Cell – Structure And Functions
  • Changes Around Us
  • Chemical Effects Of Electric Current
  • Chemistry in Your Life
  • Coal And Petroleum
  • Combustion And Flame
  • Components Of Food
  • Conservation Of Plants And Animals
  • Crop Production And Management
  • Electric Current And Its Effects
  • Electricity And Circuits
  • Elements and Compounds
  • Fibre To Fabric
  • Food production and management
  • Force And Pressure
  • Forests: Our Lifeline
  • Friction
  • Fun With Magnets
  • Garbage In, Garbage Out
  • Getting To Know Plants
  • Health and Hygiene
  • Heat
  • Hydrogen
  • Life Processes: Nutrition in Animals and Plants
  • Light, Shadows And Reflections
  • Materials: Metals And Non-Metals
  • Matter and Its States
  • Metals and Non-metals
  • Micro Organisms: Friend And Foe
  • Motion And Measurement Of Distances
  • Motion And Time
  • Nutrition In Animals
  • Nutrition In Plants
  • Organization in Living Things
  • Our Environment
  • Physical And Chemical Changes
  • Pollution and conservation
  • Pollution Of Air And Water
  • Reaching The Age Of Adolescence
  • Reproduction In Animals
  • Reproduction In Plants
  • Respiration In Organisms
  • Rocks and Minerals
  • Separation Of Substances
  • Simple Machines
  • Soil
  • Some Natural Phenomena
  • Sorting Materials Into Groups
  • Sound
  • Stars And The Solar System
  • Structure of Atom
  • Synthetic Fibers And Plastics
  • The Living Organisms And Their Surroundings
  • Transfer of Heat
  • Transformation of Substances
  • Transportation In Animals And Plants
  • Universe
  • Waste-water Story
  • Water: A Precious Resource
  • Weather, Climate And Adaptations Of Animals To Climate
  • Winds, Storms And Cyclones

Middle School Math

  • Addition
  • Area and Its Boundary
  • Boxes and Sketches
  • Data Handling
  • Fun With Numbers
  • Heavy and Light
  • How Many
  • Long And Short
  • Mapping
  • Measurement
  • Money
  • Multiplication and Factors
  • Multiply and Divide
  • Numbers
  • Parts and Wholes
  • Pattern Recognition
  • Patterns
  • Play With Patterns
  • Rupees And Paise
  • Shapes And Angles
  • Shapes And Designs
  • Shapes and Space
  • Similarity
  • Smart Charts
  • Squares
  • Subtraction
  • Tables And Shares
  • Tenths and Hundredths
  • Time
Please switch to portrait mode
for the best experience.
Click to open Popup