Panting with fatigue, write sentences as they are.

Panting with fatigue, write the following sentences:

He stuck out his tongue and gasped.

He was so tired that he gasped and stuck out his tongue like a dog.

He ran for 2 kilometers and became a dog.

Knowledge expansion:

Breathing, also known as "breathing", refers to the process of gas exchange between the human body and the external environment. The process of human breathing includes three interrelated links: external breathing, including lung ventilation and lung ventilation; Transport of gas in blood; Internal respiration refers to gas exchange between tissue cells and blood and oxidative metabolism in tissue cells.

When normal adults are quiet, it is best to breathe for 6.4 seconds at a time, and the amount of gas inhaled and exhaled at a time is about 500 ml, which is called tidal volume. When people inhale hard, until they can't inhale any more; Then exhale hard until you can't breathe any more. The amount of gas exhaled at this time is called vital capacity.

Normal adult male lung capacity is about 3500 ~ 4000 ml, while female lung capacity is about 2500 ~ 3500 ml.

Researchers at the School of Dentistry of Tokyo Medical University enema pigs with oxygenated liquid and found that oxygen enters blood vessels from the intestine and is transported to various parts of the body. In May of 20021year, Nagoya University and other research teams announced the discovery of "intestinal respiration" in mammals. "Whether human beings have the same ability" has become a hot topic.

Breathing, Chinese vocabulary. The pinyin Chu m: nx: means shortness of breath, undetermined breathing, a short rest and a chance to breathe.

"Breathe" means to breathe quickly. Sometimes it also refers to a short break in intense activity.

Respiratory diseases are common and frequently-occurring diseases. The main lesions are in trachea, bronchus, lung and chest. Mild patients often cough, chest pain, and breathing is affected. In severe cases, they will die of dyspnea, hypoxia and even respiratory failure. The mortality rate in cities ranks third, while the mortality rate in rural areas ranks first.

What should be paid more attention to is that the incidence and mortality of chronic obstructive pulmonary disease (COPD, including chronic bronchitis, emphysema and cor pulmonale), bronchial asthma, lung cancer, pulmonary interstitial fibrosis and pulmonary infection are increasing at home and abroad due to air pollution, smoking and aging population.