<p class="sensei-content-description"><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-red-color">RESPIRATORY SYSTEM</mark></strong></p> All living things need energy to move and grow. They get energy by breaking down food substances. We need oxygen to break down the food in every cell of our body. Our lungs take oxygen from the air during respiration (breathing). Breathing is the process that moves air in and out of the lungs. Respiration is the process by which living organisms use oxygen of air and food to produce energy. Carbon dioxide is also produced during this process. The parts of body used in the process of breathing form the respiratory system. <p><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color">Parts of Respiratory System</mark></strong></p> <div class="sign-up-notice-after-excerpt-two" style="background-color:powderblue;"> You are viewing an excerpt of this lesson. Subscribing to the subject will give you access to the following: <ul> <li>The complete lesson note and evaluation questions for this topic</li> <li>The complete lessons for the subject and class (First Term, Second Term & Third Term)</li> <li>Media-rich, interactive and gamified content</li> <li>End-of-lesson objective questions with detailed explanations to force mastery of content</li> <li>Simulated termly preparatory exams</li> <li>Discussion boards on all lessons and subjects</li> <li>Guaranteed learning</li> <li>Win great prizes for topping the <a href="https://www.primacyebooks.com">Primacy Ebooks</a></li> </ul> </div> <div class="sensei-message info"></div>