module B1 Understanding Ourselves

The document discusses several topics related to health and biology: 1. It defines healthy as being free from disease while fitness refers to physical ability. 2. It describes the circulatory system and blood pressure, noting pressure is highest when the heart contracts. 3. Respiration and the two types - aerobic using oxygen and anaerobic not using oxygen - are summarized. 4. A balanced diet provides essential nutrients like carbohydrates, fats, proteins, vitamins, minerals, and water.