Elementary Knowledge of Human Body & Important Organs
1. Human Body Systems and Their Major Organs
| System | Main Organs | Function |
|---|---|---|
| Circulatory System | Heart, Blood, Blood Vessels | Transports oxygen, nutrients, hormones |
| Respiratory System | Nose, Trachea, Lungs | Exchange of oxygen and carbon dioxide |
| Digestive System | Mouth, Stomach, Intestines, Liver, Pancreas | Digests food and absorbs nutrients |
| Excretory System | Kidneys, Ureters, Bladder | Removes waste products (urine) |
| Nervous System | Brain, Spinal Cord, Nerves | Controls body activities; sends signals |
| Skeletal System | Bones, Joints, Cartilage | Provides structure and support |
| Muscular System | Muscles (skeletal, smooth, cardiac) | Movement and posture |
| Reproductive System | Male: Testes; Female: Ovaries, Uterus | Produces offspring |
| Endocrine System | Glands (Pituitary, Thyroid, Adrenal, Pancreas) | Secretes hormones |
| Lymphatic/Immune System | Lymph nodes, Spleen, White blood cells | Fights infections and diseases |
| Integumentary System | Skin, Hair, Nails | Protects body, regulates temperature |
2. Important Human Organs and Their Functions
| Organ | Location | Function |
|---|---|---|
| Heart | Chest (left side) | Pumps blood throughout the body |
| Lungs | Chest | Helps in breathing, oxygen and CO₂ exchange |
| Brain | Head (skull) | Controls thoughts, memory, and body functions |
| Liver | Upper right abdomen | Detoxifies chemicals, produces bile |
| Kidneys | Lower back area | Filters blood and produces urine |
| Stomach | Upper abdomen | Digests food with acids and enzymes |
| Intestines | Abdomen | Absorbs nutrients (small intestine), removes waste (large) |
| Pancreas | Behind stomach | Produces insulin and digestive enzymes |
| Skin | External body | Largest organ; protects body and regulates heat |
| Eyes | Face (head) | Sense of vision |
| Ears | Head (sides) | Hearing and balance |
Quick NDA Tips:
- Heart: 4 chambers (2 atria + 2 ventricles)
- Lungs: Right lung (3 lobes), Left lung (2 lobes)
- Brain: Divided into Cerebrum, Cerebellum, and Medulla
- Kidneys: Two bean-shaped organs, filter about 50 gallons of blood daily
- Liver: Largest internal organ
- Skin: Largest organ overall
https://chetnaias.info/difference-between-living-and-non-living-things/https://
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Current affairs are covered through daily updates, Newspaper, monthly magazines, and special classes to keep students updated.
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Doubt-clearing sessions are held regularly, either during class or through dedicated doubt resolution hours.
Chetna IAS boasts a high success rate with many students clearing top exams like UPSC, BPSC, Teachers Exam and other exams.
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