Sleep Apnea meaning
Sleep apnea is a complex sleep disorder characterized by recurrent interruptions in breathing during slumber. This condition manifests as repeated cycles of breathing cessation followed by sudden resumption, often accompanied by gasping or choking sounds. These pauses in breathing, known as apneas, can last from a few seconds to minutes and may occur dozens or even hundreds of times throughout the night. The disorder disrupts the natural sleep rhythm, preventing individuals from achieving restful and restorative sleep. Sleep apnea can be classified into different types, with obstructive sleep apnea being the most common, caused by the relaxation and collapse of throat muscles. Central sleep apnea, another form, occurs when the brain fails to send proper signals to the breathing muscles. The chronic nature of sleep apnea can lead to various health complications, including daytime fatigue, cardiovascular issues, and cognitive impairment. Its potential seriousness stems from both the immediate risks of oxygen deprivation during apnea episodes and the long-term effects of chronic sleep disturbance on overall health and well-being.
Sleep Apnea meaning: Explanation, Formulae and Practice
These topics connect maths with money decisions. Always identify cost price, selling price, principal, rate and time before using a formula.
Practical Formulae
- Profit = selling price - cost price.
- Loss = cost price - selling price.
- Profit percentage = (profit / cost price) x 100.
- Simple interest = (principal x rate x time) / 100.
- Amount = principal + interest.
Solved Example
Question: An item is bought for Rs. 500 and sold for Rs. 575. Find the profit percentage.
Working: Profit = 575 - 500 = 75. Profit percentage = (75 / 500) x 100.
Result: Profit percentage = 15%.
Unanswered Practice Questions
Try these yourself before checking notes or calculators.
- Find the loss percentage when CP is Rs. 800 and SP is Rs. 720.
- Find simple interest on Rs. 5,000 at 8% per year for 2 years.
- A shopkeeper marks an item at Rs. 1,200 and gives 10% discount. Find the selling price.
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