Day 2: The Pump of Life ❤️💨
Preparatory Stage Science | Apex Institute of Maths and Sciences
🎯 1. Concept: How We Breathe
Your body needs Oxygen to create energy. When you inhale, air travels down your windpipe into your Lungs. Inside the lungs, oxygen enters your blood, and a waste gas called Carbon Dioxide leaves your blood so you can breathe it out.
Key Organs:
- Windpipe (Trachea): The tube connecting your nose to your lungs.
- Lungs: Two sponge-like organs that swap gases.
- Diaphragm: A muscle under your lungs that moves up and down to help you breathe.
💡 2. The Heart: Our Internal Pump
Your Heart is a powerful muscle that never stops. It pumps blood through Blood Vessels. This blood carries the oxygen from your lungs and nutrients from your food to every part of your body.
Think of your blood as a delivery truck and your heart as the engine that keeps the truck moving!
🌍 3. Science in Action: Pulse & Exercise
When you run or play, your muscles work harder and need more oxygen. To deliver this oxygen faster, your heart pumps quicker, and you breathe faster. We measure the speed of your heart by feeling your Pulse.
📝 4. Lab Task: The Pulse Investigation
Objective: Observe how activity changes your heart rate.
- Find your pulse on your wrist or neck.
- Count the beats for 1 minute while sitting quietly. (This is your Resting Pulse).
- Now, do 20 jumping jacks as fast as you can!
- Measure your pulse again for 1 minute.
- Observation: Your heart rate increased because your body needed oxygen delivered to your muscles faster!
✅ 5. Day 2 Practice Test
Use the concepts above to solve these 10 questions.
Easy
1. Which organ pulls oxygen from the air into your blood?
Solution: The lungs are responsible for swapping oxygen and waste gases (Part 1).
Easy
2. The heart is a powerful ________.
Solution: The heart is a muscle that pumps blood (Part 2).
Easy
3. What is the waste gas we breathe out?
Solution: Carbon Dioxide is the waste gas removed by the lungs (Part 1).
Easy
4. What carries oxygen and nutrients through your body?
Solution: Blood acts like a delivery truck carrying supplies to your cells (Part 2).
Medium
5. Which muscle helps the lungs move air in and out?
Solution: The diaphragm is the specialized muscle for breathing (Part 1).
Medium
6. Why does your heart beat faster during exercise?
Solution: Faster pumping ensures muscles get the extra oxygen they need to work (Part 3).
Medium
7. We can measure how fast our heart is beating by feeling our:
Solution: Your pulse reflects the speed of your heart’s pumping (Part 3).
Medium
8. What tube connects your nose to your lungs?
Solution: The windpipe is the air-delivery tube for the respiratory system (Part 1).
Hard
9. Assertion (A): Your breathing rate increases during jumping jacks.
Reason (R): Your heart stops pumping blood during heavy exercise.
Reason (R): Your heart stops pumping blood during heavy exercise.
Solution: Breathing increases to get more oxygen, but the heart never stops pumping (Part 2 & 3).
Hard
10. Blood picks up oxygen in the ____ and delivers it to the ____.
Solution: The lungs provide oxygen, which the circulatory system delivers to the rest of the body (Part 1 & 2).
Very good
Excellent 👌
Wow it is very nice I score 10/9