Respiratory System Quiz
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Questions and Answers

What happens to the volume inside the chest cavity during inhalation?

  • It fluctuates, causing variable air pressure changes.
  • It decreases, leading to an increase in air pressure.
  • It increases, leading to a decrease in air pressure. (correct)
  • It remains the same, allowing for a steady airflow.

Which process occurs when the diaphragm relaxes?

  • Air pressure in the lungs decreases below atmospheric pressure.
  • The chest cavity volume increases, allowing air to rush in.
  • The ribcage falls down and in, decreasing the chest cavity volume. (correct)
  • The alveoli expand to allow more air in.

What is the role of alveoli in the respiratory system?

  • To regulate the temperature of the incoming air.
  • To facilitate gas exchange between air and blood. (correct)
  • To create pressure changes that assist in inhalation.
  • To filter impurities from the air before it enters the lungs.

How does oxygen move during the gas exchange process?

<p>From the alveoli into the blood in the capillaries. (D)</p> Signup and view all the answers

Which statement correctly describes the process of exhalation?

<p>Air is forced out due to increased pressure in the chest cavity. (D)</p> Signup and view all the answers

What is the primary purpose of respiration in living organisms?

<p>To release energy from food (A)</p> Signup and view all the answers

Which of the following best describes aerobic respiration?

<p>The release of energy from food using oxygen (C)</p> Signup and view all the answers

In the process of building cells, what is the role of amino acids?

<p>They are converted into proteins by cells (A)</p> Signup and view all the answers

Which structure is responsible for keeping the windpipe open?

<p>Rings of cartilage (A)</p> Signup and view all the answers

Why is it better to breathe through the nose rather than the mouth?

<p>It warms, filters, and moistens the air (D)</p> Signup and view all the answers

Which side of the heart receives deoxygenated blood from the body?

<p>Right atrium (C)</p> Signup and view all the answers

What is the primary reason for the left ventricle being thicker than the right ventricle?

<p>It has to pump blood throughout the entire body. (C)</p> Signup and view all the answers

Which function do the valves in the heart serve?

<p>To prevent backflow of blood. (D)</p> Signup and view all the answers

Which blood vessel carries oxygenated blood away from the heart?

<p>Aorta (C)</p> Signup and view all the answers

During double circulation, how many times does the blood pass through the heart?

<p>Twice (A)</p> Signup and view all the answers

Flashcards

What is respiration?

Respiration is the process of releasing energy from food. This energy is used for various life processes like growth and movement.

What is aerobic respiration?

Aerobic respiration is the release of energy from food using oxygen. This process occurs in the mitochondria of cells.

What are the products of aerobic respiration?

The products of aerobic respiration are carbon dioxide, water, and energy. The energy is released as ATP (adenosine triphosphate).

Why do we need respiration?

We need respiration to provide energy for important life processes. This includes growth, repair, movement, and maintaining body temperature.

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What is the function of the diaphragm?

The diaphragm is a dome-shaped muscle that helps with breathing. It contracts to inhale and relaxes to exhale, changing the volume of the chest cavity.

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Double Circulation

Blood passes through the heart twice during each complete circuit of the body.

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Oxygenated Blood

Blood that carries oxygen from the lungs to the left side of the heart.

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Deoxygenated Blood

Blood that carries carbon dioxide from the body to the right side of the heart, then to the lungs.

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Left Ventricle

The left ventricle is thicker than the right ventricle because it pumps blood to the entire body.

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Valves Prevent Backflow

Valves in the heart ensure blood flows in one direction by opening when blood flows the right way and closing when blood flows the wrong way.

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What happens during inhalation?

The intercostal muscles contract, pulling the ribs up and out. The diaphragm also contracts, moving it downward. This increases the volume inside the chest cavity, lowering the air pressure in the chest. Air rushes into the lungs to equalize the pressure.

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What happens during exhalation?

The intercostal muscles relax, allowing the ribcage to fall down and in. The diaphragm also relaxes, moving it upward. This decreases the volume inside the chest cavity, increasing the air pressure in the lungs. Air rushes out of the lungs to equalize the pressure.

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Alveoli

Tiny air sacs in the lungs where gas exchange takes place. They are surrounded by capillaries, facilitating the transfer of oxygen into the bloodstream and carbon dioxide out of it.

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