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Photosynthesis is the process that takes place in green plants to produce their energy. It is when light energy is converted into chemical energy. Carbon dioxide and water are taken in and used to make ox...

• Large surface area -Cell wall of alveoli is one cell thick -Good Blood supply

• To maintain a constant body temperature -To aid growth
• To allow muscle contraction
• For active transport -For protein synthesis

Smoke contains contents that can irritate the respiratory tract, which can lead to inflammation of the Bronchi. This is termed Bronchitis. Cilia may be damaged by tar, leaving them immobile, which means t...

There are two circulatory systems in the body that enable blood to flow around the body. One system is between the heart and the lungs, and the other is from the heart to every other part of the body. The...