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Anatomy Of The Respiratory System

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  • Functions of the respiratory system

    The respiratory system facilitates gas exchange, supplying oxygen to the blood and removing carbon dioxide. It also helps regulate blood pH, enables vocalization, and provides olfaction.

  • Structural divisions of the respiratory system

    The respiratory system is divided into the upper respiratory tract (nose, nasal cavity, pharynx) and the lower respiratory tract (larynx, trachea, bronchi, lungs).

  • Structure of the nose

    The nose consists of an external portion supported by bone and cartilage, and an internal nasal cavity lined with mucosa that warms, moistens, and filters air.

  • Nasal mucosa

    The nasal mucosa is a mucous membrane lining the nasal cavity, containing ciliated epithelium and mucus-producing cells to trap particles and move them toward the pharynx.

  • Paranasal sinuses

    Paranasal sinuses are air-filled cavities in the skull bones that lighten the skull, produce mucus, and help warm and humidify inhaled air.

  • Functions of the nose

    The nose filters, warms, and humidifies air, detects odors, and serves as a resonating chamber for speech.

  • Structure of the pharynx

    The pharynx is a muscular tube divided into the nasopharynx, oropharynx, and laryngopharynx, serving as a passageway for air and food.

  • Functions of the pharynx

    The pharynx conducts air to the larynx and food to the esophagus, and plays a role in vocalization and immune defense.

  • Location and structure of the larynx

    The larynx is located below the pharynx and above the trachea, composed of cartilage and muscles, housing the vocal cords.

  • Functions of the larynx

    The larynx protects the airway during swallowing, produces sound for speech, and regulates airflow to the lungs.

  • Structure of the trachea

    The trachea is a flexible tube supported by C-shaped cartilage rings, lined with ciliated mucosa to trap and expel debris.

  • Function of the trachea

    The trachea conducts air to the bronchi and clears mucus and particles via ciliary movement.

  • Structure of the bronchi

    Bronchi are branching airways from the trachea into each lung, supported by cartilage and lined with mucosa, dividing into smaller bronchioles.

  • Structure of the alveoli

    Alveoli are tiny, thin-walled air sacs surrounded by capillaries where gas exchange occurs between air and blood.

  • Function of bronchi and alveoli

    Bronchi conduct air to alveoli; alveoli facilitate oxygen and carbon dioxide exchange with the bloodstream.

  • Structure of the lungs

    The lungs are paired organs divided into lobes, containing bronchi, bronchioles, alveoli, blood vessels, and connective tissue.

  • Functions of the lungs

    The lungs perform gas exchange, oxygenating blood and removing carbon dioxide, and help regulate blood pH.

  • Structure of the thorax

    The thorax is the chest cavity enclosed by ribs, sternum, and vertebrae, containing the lungs and heart.

  • Functions of the thorax

    The thorax protects vital organs, supports respiration by enabling lung expansion and contraction.