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Human respiratory system, the system in humans that takes up oxygen and expels carbon dioxide. The major organs of the respiratory system include the nose, pharynx, larynx, trachea, bronchi, lungs, and diaphragm. Learn about the anatomy and function of the respiratory system in this article.
When the air pressure within the alveolar spaces falls below atmospheric pressure, air enters the lungs (inspiration), provided the larynx is open; when the air pressure within the alveoli exceeds atmospheric pressure, air is blown from the lungs (expiration).
2024年8月17日 · The human body is the physical substance of the human organism. Characteristic of the vertebrate form, the human body has an internal skeleton with a backbone, and, as with the mammalian form, it has hair and mammary glands. Learn more about the composition, form, and physical adaptations of the human body.
2024年9月7日 · This article provides an overview of the scientific background related to the subject of global warming. It considers the causes of rising near-surface air temperatures, the influencing factors, the process of climate research and forecasting, and the possible ecological and social impacts of rising temperatures.
2024年8月21日 · What was the Watergate scandal? Who were the five burglars at the DNC office in the Watergate office complex? Who was Deep Throat in the Watergate scandal? Which U.S. president granted a pardon to Richard Nixon in connection to Watergate? What was the outcome of the Watergate scandal on the presidency of Richard Nixon?
This is an alphabetically ordered list of the countries of the world. (See also geography and While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any ...
2024年8月20日 · psychology, scientific discipline that studies mental states and processes and behaviour in humans and other animals. The discipline of psychology is broadly divisible into two parts: a large profession of practitioners and a smaller but growing science of mind, brain, and social behaviour. The two have distinctive goals, training, and ...
