External respiration takes place in the
(1 point)
O bronchi
O trachea
O alveoli
O diaphragm
External respiration takes place in the alveoli.
External respiration takes place in the alveoli.
External respiration refers to the exchange of gases (oxygen and carbon dioxide) between the lungs and the external environment. It occurs in the respiratory system, specifically in the alveoli.
To understand this, we need to know the function of each of the options provided:
1. Bronchi: The bronchi are the main air passages that connect the trachea to the lungs. They do not directly participate in gas exchange.
2. Trachea: The trachea, also known as the windpipe, is the airway that connects the larynx to the bronchi. Similar to the bronchi, it does not directly participate in gas exchange.
3. Alveoli: Alveoli are small air sacs located at the end of the bronchioles in the lungs. These tiny structures are the site of gas exchange, where oxygen from the inhaled air enters the bloodstream, and carbon dioxide from the bloodstream is expelled into the lungs to be exhaled.
4. Diaphragm: The diaphragm is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. It plays a crucial role in the process of breathing by contracting and relaxing to aid in the inhalation and exhalation of air.
Based on this information, the correct answer is the alveoli.