Where does gas exchange primarily occur in human lungs?

Gas Exchange Quiz

Quiz
•
Science
•
7th Grade
•
Hard
Adriana Dima
Used 1+ times
FREE Resource
50 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trachea
Bronchi
Alveoli
Bronchioles
Answer explanation
Gas exchange primarily occurs in the alveoli, which are tiny air sacs in the lungs. They provide a large surface area for oxygen and carbon dioxide to be exchanged between the air and the bloodstream.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main gas exchanged in the alveoli?
Nitrogen
Oxygen
Helium
Hydrogen
Answer explanation
The main gas exchanged in the alveoli is oxygen. During respiration, oxygen from the air enters the alveoli and diffuses into the blood, while carbon dioxide is expelled from the blood into the alveoli to be exhaled.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which process is responsible for gas exchange in the lungs?
Active transport
Osmosis
Diffusion
Filtration
Answer explanation
Diffusion is the process by which oxygen and carbon dioxide move across the alveolar membrane in the lungs. This passive movement occurs from areas of higher concentration to lower concentration, facilitating gas exchange.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which gas is released from the blood into the alveoli during gas exchange?
Oxygen
Carbon monoxide
Nitrogen
Carbon dioxide
Answer explanation
During gas exchange in the lungs, carbon dioxide is released from the blood into the alveoli to be exhaled. This process is essential for removing waste gases from the body, making carbon dioxide the correct answer.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of hemoglobin in gas exchange?
Transport oxygen
Transport carbon dioxide
Remove nitrogen
Store energy
Answer explanation
The primary function of hemoglobin is to transport oxygen from the lungs to the tissues. It binds oxygen molecules, facilitating efficient gas exchange, which is crucial for cellular respiration.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which structure in fish is primarily responsible for gas exchange?
Lungs
Gills
Skin
Fins
Answer explanation
Gills are the primary structures in fish responsible for gas exchange. They extract oxygen from water and expel carbon dioxide, allowing fish to breathe underwater, unlike lungs which are used by terrestrial animals.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What factor influences the rate of diffusion during gas exchange?
Concentration gradient
Blood volume
Pressure of air
Muscle contraction
Answer explanation
The concentration gradient is the primary factor influencing the rate of diffusion during gas exchange. A higher concentration gradient allows gases to diffuse more rapidly from areas of high concentration to low concentration.
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