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Nervous System of the Humans The nervous system is an organ system containing a network of specialized cells called neurons that coordinate the actions of an animal and transmit signals…

Circulatory System in the Humans The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body. The heart pumps the blood…

Temperature Control Panting in dogs and some other animals provides a means of controlling body temperature. This physiological response is used as a cooling mechanism. Coughing and Sneezing Irritation of…

Non Respiratory Functions Lung defense mechanisms Airways epithelial cells can secrete a variety of molecules that aid in lung defense. Secretory immunoglobulins (IgA), collections (including Surfactant A and D), defensins…

The Respiratory System The Respiratory System is the anatomical system of an organism that introduced respiratory gases to the interior and performs gas exchange. In humans and other mammals, the…

Human Digestive System The human digestive system is a complex series of organs and glands that processes food. In order to use the food, we eat, our body has to…

Other Nutrients Other micronutrients include antioxidants and phytochemicals. These substances are generally more recent discoveries that have not yet been recognized as vitamins or as required. Phytochemicals may act as…