Animal Breathing

3. Either of two spongy, saclike respiratory organs in most vertebrates, occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen.
4. Any of various warm-blooded, egg-laying, feathered vertebrates of the class Aves, having forelimbs modified to form wings.
7. A tiny, thin-walled, capillary-rich sac in the lungs where the exchange of oxygen and carbon dioxide takes place.
8. The section of the digestive tract that extends from the mouth and nasal cavities to the larynx, where it becomes continuous with the esophagus.
11. The part of the respiratory tract between the pharynx and the trachea, having walls of cartilage and muscle and containing the vocal cords enveloped in folds of mucous membrane.
13. Any of various warm-blooded vertebrate animals of the class Mammalia.
15. One of the internal respiratory tubes of insects and some other terrestrial arthropods.

1. Is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide.
2. Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces.
5. Are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton.
6. Cartilaginous tube descending from the larynx to the bronchi and carrying air to the lungs.
9. The movement of gases from an area of higher concentration to an area of lower concentration.
10. A muscular membranous partition separating the abdominal and thoracic cavities and functioning in respiration.
12. Either of two main branches of the trachea, leading directly to the lungs.
14. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.