The human digestive system refers to the organs that take in food and break them down. Digestion describes the complex process that enables the nutrients in food to enter the body and its cells.

Respiratory tract diseases are illnesses that affect components of the respiratory system, including the nasal passages, the bronchi and the lungs. They range from acute infections, such as ...

Indicative content may include the anatomical and physiological functions of the following systems: Cellular; Nervous system; Musculoskeletal system; Endocrine system; Cardiovascular system; ...