Index

Introduction
Homeostasis
Life Span
Systems
Regulatory Functions
Nervous System
Eyes
Ears
Nose
Tongue
Brain
Endocrine System
Hypothalmus
Pituitary
Thyroid
Adrenal
Nutritional Functions
Excretary Functions
Urinary System
Kidney
Bladder
Colon
Distributive Functions
Cardiovascular System
Blood
Respiratory System
Protective Functions
Reproductive Functions
Musculo-Skeletal System
Cancer
Arthritis
Obesity
Diabetes
Cushing's Disease
Heart Disease
Teeth
Skin and Coat
Conclusion
References


Respiratory System

The major organs of the respiratory system are the nose, mouth, pharynx, esophagus, trachea, chestwall and the lungs. Dogs, use their lungs, not only to capture introduce oxygen to the blood and to exhaust carbon dioxide to the environment, but also for cooling. In hot, humid, confined environments, older dogs are at greater risk to overheating.

The nose--dogs breathe in through their noses and out through their mouths. The nose secretes large volumes of water used in evaporative cooling. By comparison with the evaporative cooling done by the nose and the lungs, the evaporation from a dripping tongue is relatively minimal. Short-nosed (brachycephalic) dogs such as Pugs, are do not have the nasal anatomy for efficient cooling, and are therefore susceptible to overheating, especially in old age when cardiac and pulmonary capacity are less.

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