Gas exchange grade 8 Quiz

What are the main organs of the respiratory system?

• Heart and liver

• Kidneys and stomach

• Brain and intestines

• Lungs and trachea

Explain the function of the diaphragm in the process of breathing.

• It has no function in the process of breathing.

• It expands to allow the lungs to deflate during inhalation and contracts to allow the lungs to expand during exhalation.

• It contracts and flattens to allow the lungs to expand during inhalation and relaxes to allow the lungs to deflate during exhalation.

• It is responsible for pumping blood to the lungs during inhalation and exhalation.

What is the role of alveoli in the gas exchange process?

• Alveoli produce mucus in the lungs

• Alveoli regulate blood flow in the brain

• Alveoli facilitate the exchange of gases in the lungs.

• Alveoli help in digestion in the stomach

How does diffusion of gases occur in the lungs?

• Active transport

• Passive transport

• Osmosis

• Facilitated diffusion

Explain the process of oxygen transport in the blood.

• Hemoglobin in red blood cells binds to oxygen and carries it to tissues throughout the body.

• Oxygen is transported in the blood through the nervous system

• Oxygen is transported in the blood through the skeletal system

• Oxygen is transported in the blood through the digestive system

What happens to carbon dioxide in the blood during gas exchange?

• It is exchanged for oxygen in the lungs.

• It is stored in the liver for later use

• It is released into the atmosphere through the skin

• It is converted into water in the lungs

Describe the structure of the trachea and its function in breathing.

• The trachea is a bone structure and its function is to produce mucus for breathing

• The trachea is a solid tube made of nerves and its function is to regulate body temperature

• The trachea is a tube made of cartilage rings and lined with ciliated epithelium. Its function is to carry air to and from the lungs during breathing.

• The trachea is a flexible tube made of muscle and its function is to pump air into the lungs

What is the function of the bronchioles in the respiratory system?

• Carrying air to the alveoli for gas exchange

• Filtering out dust particles from the air

• Regulating the flow of blood to the lungs

• Producing mucus to trap bacteria

How does the concentration gradient affect the diffusion of gases in the alveoli?

• It causes gases to move from an area of low concentration to an area of high concentration.

• It allows gases to move from an area of high concentration to an area of low concentration.

• It has no effect on the diffusion of gases in the alveoli.

• It only affects the diffusion of liquids, not gases.

Explain the role of hemoglobin in the transport of oxygen and carbon dioxide.

• Hemoglobin binds to oxygen in the lungs and carries it to the body's tissues, and also helps transport carbon dioxide from the tissues back to the lungs.

• Hemoglobin only carries carbon dioxide from the tissues to the lungs

• Hemoglobin breaks down oxygen in the lungs and releases it into the body's tissues

• Hemoglobin has no role in the transport of oxygen and carbon dioxide