Human respiratory system diagram class 10

An exchange of oxygen and carbon dioxide takes place in the alveoli, small structures within the lungs. The carbon dioxide, a waste gas, is exhaled and the cycle begins again with the next breath. The diaphragm is a dome-shaped muscle below the lungs that controls breathing. The diaphragm flattens out and pulls forward, drawing air into the lungs for inhalation. During exhalation the diaphragm expands to force air out of the lungs. Adults normally take 12 to 20 breaths per minute. Strenuous exercise drives the breath rate up to an average of 45 breaths per minute. Related: •

Human Respiratory System ( labeled in the diagram ) The parts of the Nostrils • Air is taken into the body through the nostrils. • It is lined by fine hair and mucus which helps to filter the air entering through it. Nasal Passage • Air entering the nostrils leads to the nasal passage. • It is mainly the conducting zone for air. Pharynx • Nasal chamber opens into the • It passes air into larynx. • Larynx (or Sound Box) • It is located in the neck region and in front of the • It also produces sound. Trachea (windpipe) The air passes from the pharynx and goes into the trachea. Incomplete rings of cartilage keep the trachea open allowing the passage of air to the lungs. These ensure that theair passage does not collapse. Bronchi and Bronchioles Bronchi Trachea divides into two smaller tubes called bronchi after entering the thoracic cavity, which further extends into each lung. Bronchioles • Bronchi are subdivided into smaller tubes called bronchioles. • Each bronchiole finally terminates into many alveoli. Alveoli Alveoli – diagram • These are balloon-like structures located inside the lungs. • A large number of alveoli increases the surface area for the exchange of gasses. • Human alveolar surface when spread can cover an area of 80 m². Ribs • These are 12 pairs of bones that form a cage in the thoracic region. • Lungs and heart are safely placed in it. • Movement of intercostal muscles attached to ribs helps in breathing. Lungs • These are primary organs for respiration, w...

Solved the very best collection of Life Processes Life Processes Class 10 Important Questions with Answers Science Chapter 6 Life Processes Class 10 Important Questions Very Short Answer Type Question 1. Name the tissue which transports soluble products of photosynthesis in a plant. [AI 2008] Answer: Phloem tissues Question 2. Name the tissue which transports water and mineral in a plant. [AI 2008] Answer: Xylem. Question 3. Which pancreatic enzyme is effective in digesting proteins? [Foreign 2008] Answer: Pancreatic trypsin. Question 4. Which enzyme, present in saliva breaks down starch? [Foreign 2008] Answer: Salivary amylase. Question 5. Name the process by which autotrophs prepare their own food. Answer: Photosynthesis. Question 6. What would be the consequence of deficiency of haemoglobin in your body? [CBSE 2013] Answer: Hemoglobin is a red pigment which carries oxygen in blood to supply to all the parts of the body. Due to its deficiency the supply of oxygen would be low and the energy released in the body would be also low which may lead to a disease called anemia. Question 7. List three characteristics of lungs which make it an efficient respiratory surface. [CBSE 2013] Answer: The three characteristics of the lungs are: • Large surface area: Lungs provide a large surface area in the form of alveoli inside for the exchange of gases by diffusion. This helps in the absorption of oxygen. • Thin walls: The air sacs/alveoli are thin which allows the quick diffusion of ...