Windpipe and Lungs
Windpipe and Lungs
Wind Pipe: The trachea is a wide, hollow tube that connects the larynx (voice box) to the bronchi of the lungs, allowing the passage of air to the lungs.
The trachea extends from the larynx and branch into two primary bronchi. The bronchi than divides into smaller and smaller branches(branchioles).
The bronchioles enter the lungs and divide further into fine branches called alveolar ducts. This opens into extremely thin walled, grape shaped air sacs, where the exchange of gases takes place called alveoli. Each alveoli is covered by a web of blood capillaries which helps in exchange of gases between lungs and the body parts.
Lungs: The lungs are the primary organs of the respiratory system in humans. The lungs are a pair of spongy, air filled organs located on the either side of the chest (thorax). Human have two lungs, a right lung and a left lung. They are situated with in the thoracic cavity of the chest. The right lung is bigger than the left, which share space in the chest with the heart. The lungs are present in the cavity called as plueral cavity and covered with double plueral membrane. The right lung consist of three chambers whereas left lung is consist of two chambers. Thoracic muscles help in the expension and relaxation of lungs during the process of breathing.
Lungs are present in chest cavity. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm form the floor of the chest cavity. During inhalation the ribs move_____________ and diaphragm moves____________. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) The trachea is a wide, hollow tube that connects the larynx (voice box) to the bronchi of the lungs, allowing the passage of air to the lungs. (b)The trachea extends from the larynx and branch into two primary bronchi. The bronchi than divides into smaller and smaller branches(branchioles). (c) The bronchioles enter the lungs and divide further into fine branches called alveolar ducts. | |||
| Right Option : D | |||
| View Explanation | |||
Each human lungs contain _____________alveoli. | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
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8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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10thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
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