1 00:00:02,480 --> 00:00:18,350 the respiratory system. The most important function of the respiratory system is to take in oxygen 2 00:00:18,910 --> 00:00:34,509 and eliminate carbon dioxide. Oxygen enters through the respiratory system when we breathe in. 3 00:00:35,229 --> 00:00:43,630 Then the carbon dioxide leaves our body when we breathe out. Inhalation, we breathe in oxygen. 4 00:00:43,630 --> 00:00:59,219 exhalation without carbon dioxide. The respiratory system is made up of the 5 00:00:59,219 --> 00:01:16,040 nostrils, the trachea, the bronchi and the lungs. The nose has two holes called 6 00:01:16,040 --> 00:01:25,519 nostrils where the air enters our body. The nose warms the air. The hairs in the 7 00:01:25,519 --> 00:01:48,439 nostrils clean the air. Oxygen goes down the trachea. The trachea is a tube that 8 00:01:48,439 --> 00:01:56,120 divides into two smaller tubes called bronchi. The air goes down the bronchi 9 00:01:56,120 --> 00:02:19,729 into the two lungs. The lungs are two sacs that are protected by our ribs. The 10 00:02:19,729 --> 00:02:23,370 The lungs are made up of lots of little sacs. 11 00:02:24,330 --> 00:02:27,449 The air goes into these little sacs. 12 00:02:28,310 --> 00:02:31,830 These sacs are called alveoli. 13 00:02:40,180 --> 00:02:43,080 The air goes into these little sacs. 14 00:02:43,740 --> 00:02:47,159 The oxygen passes from the air into the blood. 15 00:02:55,919 --> 00:02:59,180 Carbon dioxide passes from the blood into the air. 16 00:02:59,879 --> 00:03:04,039 Then, the carbon dioxide leaves our body when we breathe out. 17 00:03:04,039 --> 00:03:22,590 Hey, buddy, you're breathing very quickly. 18 00:03:23,349 --> 00:03:24,710 Hmm, take a rest. 19 00:03:25,409 --> 00:03:28,849 Let's learn about breathing and the respiratory system today. 20 00:03:29,610 --> 00:03:32,930 Humans breathe through something called the respiratory system. 21 00:03:33,469 --> 00:03:36,229 We breathe in oxygen and breathe out carbon dioxide. 22 00:03:36,990 --> 00:03:38,930 This process is called respiration. 23 00:03:39,669 --> 00:03:45,030 Breathing happens automatically, and every day we breathe about 20,000 times. 24 00:03:45,710 --> 00:03:47,689 Breathing occurs in our respiratory system. 25 00:03:48,629 --> 00:03:53,289 This includes the nose, throat, voice box, windpipe, and the lungs. 26 00:03:54,289 --> 00:03:55,830 Let's see the parts and functions. 27 00:03:56,849 --> 00:04:01,250 The nostrils bring air inside the nose, where it gets warmed and filtered. 28 00:04:02,030 --> 00:04:06,750 Inside the nostrils, there are cilia that protect the nasal passageways. 29 00:04:07,550 --> 00:04:10,169 Sometimes air is breathed in through the mouth. 30 00:04:10,169 --> 00:04:14,590 The two airways of the mouth and nose meet at the pharynx. 31 00:04:14,590 --> 00:04:21,750 There are two paths, one for food called the esophagus and another for air called trachea. 32 00:04:22,490 --> 00:04:29,970 We have a leaf-shaped flap of tissue called the epiglottis that keeps food from entering the windpipe and the lungs. 33 00:04:30,790 --> 00:04:37,629 The larynx or voice box is about 5 cm long, located between the pharynx and the trachea. 34 00:04:38,069 --> 00:04:40,009 Our vocal cords are found there. 35 00:04:40,829 --> 00:04:45,250 The windpipe, or trachea, is a tube about 3 centimeters 36 00:04:45,250 --> 00:04:50,290 extending downwards from the bottom of the larynx for about 12 centimeters. 37 00:04:51,029 --> 00:04:56,230 The walls of the trachea are covered with stiff rings of cartilage that keep it open. 38 00:04:56,850 --> 00:05:02,370 It's lined with small hairs that sweeps fluids and foreign particles out of the airways. 39 00:05:02,810 --> 00:05:07,529 The windpipe divides into two parts, and each of these enters the lungs, 40 00:05:07,529 --> 00:05:10,949 dividing into tinier branches called the bronchioles. 41 00:05:11,670 --> 00:05:15,970 They end in alveoli that are tiny air sacs within the lungs 42 00:05:15,970 --> 00:05:19,949 where the exchange of oxygen and carbon dioxide takes place. 43 00:05:20,290 --> 00:05:22,050 It's surrounded by capillaries. 44 00:05:22,670 --> 00:05:25,670 The oxygen passes through these air sacs 45 00:05:25,670 --> 00:05:29,170 and travels through the walls of capillary into the bloodstream. 46 00:05:29,889 --> 00:05:35,310 At the same time, carbon dioxide flows from the bloodstream into the air sacs 47 00:05:35,310 --> 00:05:37,410 where it gets breathed out of the body. 48 00:05:37,529 --> 00:05:43,689 When we exercise, our body needs more oxygen because the muscles work harder than normal, 49 00:05:44,069 --> 00:05:46,410 so we breathe more deeply and quickly. 50 00:05:47,350 --> 00:05:49,990 More capillaries form around the air sacs, 51 00:05:50,149 --> 00:05:55,149 and due to this, the body gets better at swapping oxygen and carbon dioxide. 52 00:05:56,110 --> 00:06:01,310 Eating healthy foods and exercising can help keep your respiratory system healthy. 53 00:06:01,889 --> 00:06:05,810 Now, you know a lot about the respiratory system. 54 00:06:05,810 --> 00:06:12,110 Please drop a like, leave a comment, share the videos, and don't forget to subscribe. 55 00:06:12,769 --> 00:06:13,709 Bye-bye.