You can compare it with a tennis court. Now, why so large a surface area. Our oxygen supply for the whole body comes from the lungs. And in the lungs exchange between carbon dioxide and oxygen takes place on the respiratory surface of the lungs. We need a lot of gaseous exchange to maintain all of our metabolism. So we need a larger surface area to ensure faster gaseous exchange. The large surface area we do not understand. Because it remains in the form of an alveolar surface.
Due to some diseases, this surface area sometimes reduces drastically. They face difficulty in breathing. Amphibians like frogs and toads , birds , and mammals breath through lungs but in the case of frogs besides lungs, they can breathe through their skin , in the case of humans lungs not only take part in breathing, lungs take part in excretion also. During aerobic respiration respiratory materials break down with the help of oxygen and this process meets our energy requirements but the oxygen required during aerobic respiration comes in some animals with the help of lungs , inside lungs gaseous exchange take place where oxygen dissolve into blood and the carbon dioxide produced during respiration goes outside of the body.
In the lungs, the wall of alveoli is highly vascularised with blood capillaries and the wall of alveoli makes the respiratory surface. On the respiratory surface carbon dioxide comes out from the blood capillary and oxygen present in the alveoli diffuse into the capillary blood. In humans, the right and the left lungs are not equal in size, the left lung is a little bit smaller than the right lungs.
It is due to the accommodation of the heart on the left side in our chest cavity but the right lung is much shorter and broader than the left lung because on the right side liver is present and the shorter right lung leaves some space for the liver.
Its short answer is Yes, humans can live with a single lung in case of a lung is removed due to any serious medical conditions because the single lung can provide a sufficient amount of oxygen need to respire and can easily remove the carbon dioxide efficiently for a healthy person. Prior to the lungs, the trachea splits into the left and right bronchi.
Each primary bronchi branches into secondary bronchi upon entering the lungs. The secondary bronchi divide further into tertiary bronchi, which have many small bronchioles branching forth. Terminal bronchiole branches and grape-like clusters of alveolar sacs extend from the bronchioles. The alveoli are surrounded by capillary beds. There are about million alveoli in your lungs and if you stretched them out, they would cover an entire tennis court.
Experiments have shown that an average human being at rest inhales and exhales about 7 or 8 liters of air per minute. That totals to more than 11, liters of air in a day. Thus, the correct answer is option A.
Was this answer helpful? A normal minute volume while resting is about 5—8 liters per minute in humans. Minute volume generally decreases when at rest, and increases with exercise. For example, during light activities minute volume may be around 12 litres. Tidal volume TV is the amount of air breathed in with each normal breath. The average tidal volume is 0. Minute ventilation VE is the total volume of air entering the lungs in a minute.
The average minute ventilation is 6 litres per minute. Lung capacity or total lung capacity TLC is the volume of air in the lungs upon the maximum effort of inspiration. Among healthy adults, the average lung capacity is about 6 liters.
Age, gender, body composition, and ethnicity are factors affecting the different ranges of lung capacity among individuals. Each inhalation adds from mL of additional air for normal resting breathing. Each exhalation removes approximately the same volume as was inhaled. The volume of air inhaled and exhaled normally is called the tidal volume. It takes approximately 5 seconds to complete a single cycle.
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