1. HUMAN RESPIRATORY SYSTEM Presentation Made By:- KARAN SAXENA X - A

2. This presentation is about human respiratory system, an essential function of human body

3. The Respiratory System Respiration is the process in which oxygen is taken in and carbon dioxide is released from the body. Energy is also released which is utilized to carry out various living processes. The respiratory system consists of the following organs:-

4. This is how the lungs expand itself when the air enters or exits from it.

9. The blood then carries the oxygen to all parts of your body.

10. An Alveoli – Air Sac At the same time, carbon dioxide from the blood passes through your blood vessel into the air sacs. Carbon dioxide mixes with the air in your air sacs. Air Sac Blood Vessel

11. The Nasal Cavity Air enters the nose through two nostrils and reaches the nasal cavity. Here the air is warmed and filtered. The hair present in the nostrils stop the dust or germs from entering the human respiratory system.

12. Pharynx and Larynx The nasal cavity leads into an organ called pharynx. From the pharynx, the air passes into a chamber called larynx. The larynx produces sound and is also called the voice box. The opening of pharynx into larynx is guarded by a valve called epiglottis. This closes the opening while we swallow food and keeps it open during breathing.

13. Wind Pipe The wind pipe is a delicate muscular tube situated in the front of oesophagus or the wind pipe. It is also called trachea. It is 12 cm in length and 2.5 cm in diameter. The wind pipe is divided into two parts called Bronchi as it enters the lungs.

14. Bronchi and Bronchioles When a person takes in a breath of air, the air travels through the nose or mouth, into the larynx, and then into the trachea, which is the main passageway into the lungs. The trachea divides into a right and left main bronchus. Each major bronchus then subdivides into smaller airway passages referred to as bronchi. As the airway passages make their way out to the lung tissue, the passages become smaller and are referred to as bronchioles.

15. Lungs The bronchi leads into the lungs which are situated on either side of the chest cavity. Lungs contain a number of air sacks and blood vessels.

16. Thanks