The Respiratory System Gaining oxygen from the environment while riding the body of water and carbon dioxide
Breathing vs. Respiration • Breathing is the movement of air into and out of the lungs. • Respiration is the releasing of energy through chemical reactions that act on oxygen and glucose inside cells.
Nose • The nose is where air enters into the nostrils. The nose is lined with cilia and mucus.
Cilia • Cilia traps particles of dirt and dust from the air. The cilia filters the air we breathe.
Mucus • Mucus warms and moistens the air that enters the body. Mucus is present in the nasal cavity and other locations throughout the body.
Pharynx • Another term for the throat, which is the passageway that air enters through the nose. • Food also enters via the pharynx.
Trachea • A tube made of cartilage that leads from the pharynx toward the lungs.
Cartilage Rings • Rings around the trachea that strengthen the trachea and keep it open.
Bronchi • Branches that lead from the trachea into the lungs. Bronchi passageways get smaller and smaller until they reach the alveoli. The right and left bronchi lead to each lung; part of them are inside and part are outside of the lungs.
Alveoli • Alveoli are tiny sacs of lung tissue that allow oxygen to pass into the blood and carbon dioxide to pass out of the blood.
Lungs • The main organs of the respiratory system. Inside the lungs are passageways called bronchi which direct air into the lungs.
Diaphragm • The diaphragm is a large arched muscle that moves downward when inhaling to allow more air in, and moves upward when exhaling to push more air out.
Epiglottis • The epiglottis is a flap of tissue that seals off the windpipe to prevent food from entering into the airways.
Larynx • The larynx is the voce box of the body; it is located in the top of the trachea under the epiglottis.
Vocal Chords • The vocal chords are folds of connective tissue that stretch across the larynx (voice box) to produce a person’s voice.