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Sign in to searchBIOLOGY
PRERNA FOR IAS
LIFE PROCESSES
1. Human Digestive System
The human digestive system is responsible for breaking down food into simpler substances that the body can absorb and use for energy, growth, and repair. Digestion begins in the mouth, where food is chewed and mixed with saliva. It then passes through the esophagus to the stomach, where digestive juices further break it down. The small intestine completes digestion and absorbs nutrients into the bloodstream. The liver and pancreas produce important digestive substances that aid this process. The large intestine absorbs water and forms waste, which is expelled through the anus. A healthy digestive system is essential for overall health.
2. Human Respiratory System
The human respiratory system enables the exchange of gases between the body and the environment. Air enters through the nose and passes through the nasal cavity, trachea, bronchi, and bronchioles before reaching the alveoli in the lungs. The alveoli are tiny air sacs where oxygen enters the blood and carbon dioxide leaves the blood. Oxygen is transported to body cells for energy production, while carbon dioxide is removed as a waste product. Breathing involves inhalation and exhalation, controlled by the diaphragm and chest muscles. A healthy respiratory system is vital for supplying oxygen and maintaining life processes.
3. Human Heart and Circulation
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Learn about human digestive, respiratory, and circulatory systems plus photosynthesis. Understand how life processes sustain growth, energy, and oxygen in organisms.
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