Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Exercise involves physical activities like running, swimming, or playing sports that keep our body fit and active.
Regular exercise improves blood circulation throughout the body, ensuring the heart () pumps blood efficiently.
Exercise helps in building strong muscles and bones, increasing the overall strength of the body.
Rest is the period when our body and brain relax to regain lost energy. A child in Grade 3 needs at least to hours of sleep every night.
During sleep, the body performs 'repair work' on cells and tissues, which is essential for growth.
Maintaining a correct posture while sitting, standing, and walking is necessary to keep our backbone (spine) healthy.
Lack of sleep can make a person feel tired, irritable, and unable to concentrate on studies.
📐Formulae
💡Examples
Problem 1:
If Rohan sleeps at and wakes up at , calculate if he is getting enough rest according to the hours rule.
Solution:
Explanation:
Since falls within the recommended range of to hours, Rohan is getting sufficient rest.
Problem 2:
Why does our breathing rate increase when we perform vigorous exercise like sprinting?
Solution:
Explanation:
During exercise, our muscles need more energy and oxygen (). To supply this, the heart beats faster and we breathe more quickly.
Problem 3:
Identify the benefit of maintaining a straight back while sitting at a desk.
Solution:
It prevents and keeps the properly aligned.
Explanation:
Correct posture ensures that the muscles and ligaments are not strained, allowing the body to function efficiently without pain.