What are the THREE functions/roles of the respiratory system? A.) Taking in oxygen B.) Taking in hydrogen C.) Removing carbon dioxide D.) Removing water 2. Which TWO statements are TRUE about oxygen? A.) The air you breathe is part of the Earth's atmosphere, which is the blanket of gases surrounding the Earth. B.) Oxygen makes up about 78% of the atmosphere's gases. C.) Your body uses all the air you inhale into your lungs. D.) Most of the air you inhale is exhaled back into the atmosphere. 3. Fill in the Blank: ____________________ is needed for the energy-releasing chemical reactions that occur inside your cells. 4. True/False: Breathing refers to the movement of air into and out of the lungs. A.) True B.) False 5. True/False: During respiration, oxygen reacts with glucose to release energy. A.) True B.) False 6. What are the two main gases exchanged by the respiratory system?

Let's break down and answer each question:

1.The THREE functions/roles of the respiratory system are:

• A.) Taking in oxygen
• C.) Removing carbon dioxide
• D.) Removing water

2.The TWO true statements about oxygen are:

• A.) The air you breathe is part of the Earth's atmosphere, which is the blanket of gases surrounding the Earth.
• D.) Most of the air you inhale is exhaled back into the atmosphere.

3.Fill in the Blank: Oxygen is needed for the energy-releasing chemical reactions that occur inside your cells.

4.True/False: Breathing refers to the movement of air into and out of the lungs.

• A.) True

5.True/False: During respiration, oxygen reacts with glucose to release energy.

• A.) True

6.The two main gases exchanged by the respiratory system are:

• Oxygen (O2) and Carbon Dioxide (CO2)

The human respiratory system is critical for our survival. Here’s a closer look at the concepts surrounding the functions of the respiratory system:

• Taking in oxygen (O2): When we inhale, we bring oxygen from the atmosphere into our lungs. Oxygen is then diffused into our bloodstream through tiny air sacs called alveoli. This process is essential because oxygen is a critical component for producing energy in cells throughout the body.
• Removing carbon dioxide (CO2): Carbon dioxide is a waste product produced by cells when they use oxygen to make energy. The blood carries this CO2 back to the lungs, where it’s expelled from the body when we exhale.
• Removing water: Along with CO2, water vapor is also a byproduct of cellular respiration and is released from the body through exhalation.

When we discuss the atmosphere and oxygen content:

• The Earth's atmosphere is primarily composed of nitrogen (around 78%), oxygen (around 21%), and small amounts of other gases including argon, carbon dioxide, and water vapor.

In cellular respiration:

• Oxygen, as mentioned in the fill-in-the-blank, is used by cells to break down glucose in a series of energy-releasing chemical reactions known as cellular respiration.
• Breathing, as stated in the true/false question, is a physical process of moving air in and out of the lungs, whereas cellular respiration involves biochemical pathways that release energy from nutrients with the help of inhaled oxygen.
• The respiratory system's role in exchanging two main gases (oxygen and carbon dioxide) is directly tied to the process of cellular respiration where oxygen is used and carbon dioxide is produced. This cycle is essential for maintaining homeostasis in the body and allowing cells to generate ATP, the energy currency of the cell.