Life Processes: Transportation, Excretion, Respiration, Nutrition
Transportation:
- The process by which substances move around the body to where they are needed.
- In humans, transportation occurs through the circulatory system, which consists of the heart, blood vessels, and blood.
- Nutrients, oxygen, hormones, and waste products are transported through the blood to different parts of the body.
Excretion:
- The process of removing waste products or harmful substances from the body.
- In humans, excretion mainly occurs through the kidneys, which filter waste from the blood to form urine.
- Other organs involved in excretion include the lungs (excreting carbon dioxide) and the skin (excreting sweat).
Respiration:
- The process of exchanging gases, such as oxygen and carbon dioxide, between an organism and its environment.
- In humans, respiration involves breathing in oxygen and exhaling carbon dioxide through the lungs.
- Cellular respiration is the process by which cells break down glucose to release energy for the body to use.
Nutrition:
- The process by which organisms obtain and use nutrients for growth, energy, and repair.
- In humans, nutrition involves the intake of food, digestion, absorption of nutrients in the small intestine, and elimination of waste.
- Nutrients such as carbohydrates, proteins, fats, vitamins, and minerals are essential for maintaining health and function.