Skip to content
Gallery
6th Grade - ICSE
6th Grade
Share
Explore
05. Human Respiratory System

icon picker
Answer in one line

Prepared by: learnloophq@gmail.com
Last edited 25 days ago by Learn LoopHQ.

Chapter: 05. Human Respiratory System

⁠

Answer in one line

What is the primary function of respiration in living organisms?
The primary function of respiration is to take in oxygen, oxidize food (glucose) to release energy, and eliminate carbon dioxide from the body, enabling various life processes.
Name the main respiratory organs in humans.
The main respiratory organs in humans are the lungs.
Why should we breathe through our nose and not through our mouth?
We should breathe through our nose because nasal passages filter, warm, and moisten the air, trapping dust, pollen, and microbes before it reaches the lungs.
What happens if unwanted particles are not trapped by the nasal hair?
If unwanted particles are not trapped by nasal hair, they irritate the sensory lining of the nasal passages, causing sneezing to expel them.
What is the function of the epiglottis?
The epiglottis is a muscular flap that closes the glottis (opening of the trachea) during swallowing to prevent food from entering the windpipe.
What is another name for the larynx, and what is its main function?
Another name for the larynx is the voice box or Adam’s apple, and its main function is sound production through the vibration of vocal cords.
What is the purpose of the C-shaped rings of cartilage in the trachea?
The C-shaped rings of cartilage support the wall of the trachea, preventing it from collapsing and ensuring that the airway remains open.
How many bronchi are formed when the trachea divides, and where do they go?
The trachea divides into two bronchi, with each bronchus entering one of the respective lungs.
Where do bronchioles finally end in the lungs?
Bronchioles finally end in tiny air sacs called alveoli within the lungs.
Describe the general structure of the lungs.
Lungs are a pair of spongy, highly elastic, and bag-like structures that serve as the main respiratory organs.
What is the role of the diaphragm in the human respiratory system?
The diaphragm is a large muscular structure that forms the floor of the thoracic cavity and, along with rib muscles, plays a crucial role in changing the volume of the chest cavity to facilitate breathing.
How many alveoli are there approximately in human lungs, and why are they important?
There are approximately 750 million alveoli in human lungs, and they are important because their numerous, thin-walled structure provides a large surface area for efficient gas exchange.
Differentiate between breathing and respiration in terms of their nature.
Breathing is a mechanical process of moving air in and out of the lungs, whereas respiration is a biochemical process that involves gas exchange and the oxidation of food to release energy.
What are the two main processes involved in breathing?
The two main processes involved in breathing are inhalation (taking in air rich in oxygen) and exhalation (giving out air rich in carbon dioxide).
Describe the change in the diaphragm’s position during inhalation.
During inhalation, the diaphragm contracts and flattens, pulling downwards to increase the volume of the thoracic cavity.
How does the volume of the thoracic cavity change during exhalation?
During exhalation, the volume of the thoracic cavity decreases as the ribs move downwards and inwards, and the diaphragm moves upwards to its original position.
What is the approximate percentage of oxygen in inhaled air and exhaled air?
Inhaled air contains approximately 21% oxygen, while exhaled air contains approximately 16.4% oxygen.
What is the breathing rate, and what is the normal range for humans?
Breathing rate is the number of times a person breathes (one inhalation and one exhalation) in a minute, with a normal range for humans being 16-18 times per minute.
What happens to a person’s breathing rate when they are at complete rest?
A person’s breathing rate slows down when they are at complete rest.
What causes the increase in breathing rate during fast physical activity?
The increase in breathing rate during fast physical activity is caused by the body’s need for more energy, requiring an increased supply of oxygen for food oxidation and faster removal of the higher amount of carbon dioxide produced.
Briefly explain the process of external respiration in terms of gas exchange.
External respiration is the exchange of gases that occurs in the lungs, where oxygen diffuses from the air in the alveoli into the blood, and carbon dioxide diffuses from the blood into the alveoli to be exhaled.
What happens to oxyhaemoglobin when it reaches the body cells?
When oxyhaemoglobin reaches the body cells, it breaks down to release oxygen, which then enters the cells for cellular respiration.
What happens to carbon dioxide from the cells during internal respiration?
During internal respiration, carbon dioxide from the cells diffuses into the blood to be transported back to the lungs for exhalation.
What is cellular respiration?
Cellular respiration is the process where glucose is broken down inside the cells to produce carbon dioxide and energy.
List two common symptoms of asthma.
Two common symptoms of asthma are shortness of breath and difficulty in breathing, along with a whistling or wheezing sound while exhaling.
What are the common causes of bronchitis?
Bronchitis is commonly caused by viral infection, dust, air pollution, certain bacteria, smoking, or occupational hazards.
Which age groups are more susceptible to pneumonia infection?
Old people, infants, and young children are more susceptible to pneumonia infection.
How is Tuberculosis (TB) diagnosed?
Tuberculosis can be diagnosed through a combination of a skin test, blood test, chest X-rays, and sputum tests.
How can the spread of tuberculosis in society be prevented?
The spread of tuberculosis in society can be prevented by giving BCG injections to children, thereby vaccinating them against TB.
Want to print your doc?
This is not the way.
Try clicking the ⋯ next to your doc name or using a keyboard shortcut (
CtrlP
) instead.