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Prepared by: learnloophq@gmail.com
Last edited 37 days ago by Learn LoopHQ.

Chapter: 02. The Human Body

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Answer Key

The essential function of the lungs is to provide oxygen from inhaled air to the bloodstream and to exhale carbon dioxide.
The smallest unit of the human body is called a cell.
Ureters carry urine from the kidneys to the urinary bladder.
Electric vehicles are considered good for the environment because they run on electricity and produce no smoke, reducing air pollution.
Our sense organs help us to see and understand the world around us and respond accordingly.
There are approximately 360 joints in our body.
The largest bone in the human body is the femur, also known as the thigh bone.
Inhaled air is rich in oxygen, while exhaled air is rich in carbon dioxide.
Daily physical activities can help Puneet by strengthening his bones and muscles, improving flexibility, and increasing blood circulation, which can reduce pain and improve overall physical health.
Another name for the windpipe is the trachea.
Muscles help the bones to move, enabling various bodily actions.
We cannot move our elbow in all directions because it is a hinge joint, allowing movement primarily in one plane (bending and straightening) rather than full rotation.
Joints are places where two or more bones meet, allowing the body to bend and move.
In the small intestine, digested food is further broken down, and its nutrients are absorbed into the blood.
The large intestine absorbs extra water from the undigested food before it is passed out of the body.
The three main parts of the respiratory system are the nose, windpipe, and lungs.
The main function of the brain is to help us think, gather information, decide responses, and send instructions to other body parts.
The activity concludes that when space is created inside the bottle (like diaphragm contracting), air enters and fills the balloon (lungs), and when space is reduced, air is pushed out.
A doctor who specializes in treating conditions related to bones and muscles is called an orthopedist.
The heart is located in the chest cavity and its main function is to pump blood through tiny tubes called blood vessels to different parts of our body.
During exhalation, the diaphragm moves upwards, which helps to push air out of the lungs.
Clean air is important for us because we need it to survive and cannot live without it for even a few minutes.
The tiny air sacs in our lungs are called alveoli.
The skeleton gives shape and support to our body and protects its soft, inner parts.
Air pollution can make people sick, cause breathing difficulties, and lead to lung cancer, respiratory, and heart diseases.
The term for the process of taking in oxygen and giving out carbon dioxide is breathing.
We should look after our body because it is an amazing machine that performs various functions and can even repair itself.
The skull protects the soft brain.
Factories and industries contribute to air pollution by releasing smoke and other harmful gases into the atmosphere.
Two human activities that cause air pollution are the release of smoke and harmful gases from factories and the fumes from car exhausts.
It is better to sell old newspapers to a scrap dealer for recycling because burning them releases harmful smoke and gases into the atmosphere, contributing to air pollution.
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