The mouth, or oral cavity, is the first part of the digestive tract. It is adapted to receive food by ingestion, break it into small particles by mastication, and mix it with saliva. The lips, cheeks, and palate form the boundaries.

The digestive system converts the foods we eat into their simplest forms, like glucose (sugars), amino acids (that make up protein) or fatty acids (that make up fats). The broken-down food is then absorbed into the bloodstream from the small intestine and the nutrients are carried to each cell in the body.

Your nervous system is your body’s command center. It’s made up of your brain, spinal cord and nerves. Your nervous system works by sending messages, or electrical signals, between your brain and all the other parts of your body. These signals tell you to breathe, move, speak and see

Cardiac rhythm is an electrical impulse generated by highly specialized fibres capable of spontaneously producing and propagating electrical impulse in the myocardium.

An arrhythmia is a heart rhythm that isn’t normal. Your heart may be beating too fast when you’re at rest or just not beating in a regular pattern, for example.

A healthy blood pressure reading is a systolic pressure of less than 120 millimeters of mercury (mm Hg) and a diastolic pressure of less than 80 mm Hg. This is typically written as 120/80 or spoken as “120 over 80.”