Closely coupled with the circulatory system is the ventilatory (breathing) apparatus, the lungs and associated structures. Ventilation in mammals is unique. The lungs themselves are less efficient than those of birds, for air movement consists of an ebb and flow, rather than a one-way circuit, so a residual volume of air always remains that cannot be expired. Ventilation in mammals is by means of a negative pressure pump made possible by the evolution of a definitive thoracic cavity with a diaphragm. The diaphragm is a unique composite structure consisting of :
The lungs lie in separate airtight compartments called pleural cavities, separated by the mediastinum. As the size of the pleural cavity is increased, the lung is expanded and air flows in passively. Enlargement of the pleural cavity is produced by contraction of the diaphragm or by elevation of the ribs. The relaxed diaphragm domes upward, but when contracted it stretches flat. Expiration is an active movement brought about by contraction of abdominal muscles against the viscera. Air typically enters the respiratory passages through the nostrils, where it may be warmed and moistened. It passes above the bony palate and the soft palate and enters the pharynx. In the pharynx the passages for air and food cross. Air enters the trachea, which divides at the level of the lungs into primary bronchi. A characteristic feature of the trachea of many mammals is the larynx. Vocal cords stretch across the larynx and are vibrated by forced expiration to produce sound. The laryngeal apparatus may be greatly modified for the production of complex vocalizations. In some groups for example, howler monkeys the hyoid apparatus is incorporated into the sound-producing organ, as a resonating chamber.
Source - http://www.animalaqua.com/respiratory-system-mammal/
Your welcome.
The respiratory system is the system that handles breathing.
The Respiratory System
The trachea is the airway in the respiratory system.
no, they do not have a respiratory system
The respiratory system.
Respiratory system
how does the respiratory system work
1. Respiratory system 2. Cardiovascular system
The lungs are part of the respiratory system! they help the circulatory by giving oxygen, but they are just respiratory.
cycling it is good for the respiratory system cycling it is good for the respiratory system
The respiratory system.
Respiratory system