Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
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B
The main air passages that branch off from the trachea and carry air into the lungs.
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C
Tiny blood vessels that surround the alveoli and allow for the exchange of gases.
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D
A dome-shaped muscle that helps in the process of breathing by contracting and relaxing.
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E
A flap of tissue that covers the opening of the trachea during swallowing to prevent food from entering the lungs.
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G
The opening between the vocal cords in the larynx.
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H
A protein in red blood cells that carries oxygen from the lungs to the body's tissues.
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I
The process of breathing in air, which involves the diaphragm contracting and the rib muscles expanding.
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J
A major vein that carries deoxygenated blood from the head and neck back to the heart.
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L
The main organs of the respiratory system, responsible for the exchange of gases between the air and blood.
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M
The part of the brainstem that controls automatic functions, including breathing.
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N
The hollow space behind the nose that filters, warms, and moistens the air we breathe.
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O
A gas essential for respiration, which is transported from the lungs to the body's tissues by red blood cells.
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P
Is a muscular tube-shaped structure located at the back of the throat, behind the nasal cavity and mouth.
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Q
The normal, relaxed breathing that occurs at rest, controlled by the medulla in the brainstem.
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R
Is a protective structure that surrounds the thoracic cavity and plays a crucial role in the respiratory process. It is composed of twelve pairs of ribs, which are attached to the thoracic vertebrae in the back.
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S
Is the production of new molecules takes place continually throughout an organism's life, but is especially important during the organism's growth phase.
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T
The windpipe, a tube that connects the larynx to the bronchi and allows air to pass to and from the lungs.
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U
A small, fleshy mass of tissue that hangs down from the soft palate and helps to close off the nasal passage during swallowing.
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V
Are located in the larynx, they vibrate and produce sounds when air is moved.
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Y
A reflex act of opening one's mouth wide and inhaling deeply due to tiredness or boredom.
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Z
A facial bone that forms part of the eye socket and helps to protect the respiratory system.
