Human Lungs – Important Points

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 Human Lungs  Lungs are the primary organ of the respiratory system, located in the thoracic cavity. Humans have two lungs: Right lung (3 lobes) and Left lung (2 lobes) — left is smaller to accommodate the heart. Covered by a double-layered membrane called Pleura (visceral & parietal), with pleural fluid reducing friction. Main function: Gas exchange – oxygen intake and carbon dioxide removal. Air pathway: Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli. Alveoli are tiny air sacs (~300 million) where actual gas exchange occurs via diffusion. Alveolar walls are lined with a single layer of squamous epithelium for fast diffusion. Surfactant (produced by Type II alveolar cells) reduces surface tension, preventing alveolar collapse. Lungs are not muscular; breathing is driven by diaphragm and intercostal muscles. Diaphragm contraction → lung volume increases → inhalation (negative pressure). Diaphragm relaxation → lung volume decreases → exhalation. Right l...

Kidney Stones

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 KIDNEY STONES 
• Kidney stones are hard deposits formed inside the kidneys.
• They are also called renal calculi.
• Kidney stones can vary in size from a grain of sand to a golf ball.
• Calcium stones are the most common type.
• Uric acid stones are another common type.
• Dehydration is a major risk factor for kidney stones.
• Drinking less water increases the chance of stone formation.
• Men are more likely to develop kidney stones than women.
• Kidney stones can occur at any age.
• Severe pain is the most common symptom.
• Pain usually occurs in the back or side of the body.
• Blood in the urine may be a sign of kidney stones.
• Nausea and vomiting can accompany kidney stone pain.
• Frequent urination may occur.
• Burning sensation during urination can be present.
• Small stones may pass out naturally through urine.
• Large stones may require medical treatment.
• Ultrasound can help detect kidney stones.
• CT scans are highly effective for diagnosis.
• Family history increases the risk of kidney stones.
• Obesity is linked to a higher risk of kidney stones.
• High salt intake can increase stone formation.
• Excessive consumption of sugary drinks may raise risk.
• Some kidney stones are caused by infections.
• Certain medications can increase stone risk.
• Kidney stones may block urine flow.
• Untreated blockage can damage the kidneys.
• Drinking plenty of water helps prevent stones.
• Lemon juice contains citrate, which may help reduce stone formation.
• Regular physical activity supports kidney health.
• The kidneys filter waste products from the blood.
• Humans normally have two kidneys.
• Each kidney contains about one million nephrons.
• Kidneys help regulate blood pressure.
• Kidneys maintain water and electrolyte balance.
• Kidney stones can recur after treatment.
• Following a healthy diet may reduce recurrence.
• Early diagnosis improves treatment outcomes.
• Most kidney stones are preventable.
• Proper hydration is one of the best preventive measures.

Disclaimer:
This content is intended for educational and awareness purposes only and is not a substitute for professional medical advice.

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