respiratory

Nasal Cavities

Hollow spaces in the nose that are important for respiratory function.

Purpose:

  • Filter: Removes toxins ensuring sterile air enters the respiratory system, vital for preventing infections and promoting lung health.

  • Warm and Moisten the Air: The nasal cavities help to acclimatize the incoming air, which is important for comfort and effective gas exchange in the lungs.

Pharynx

  • Chamber connecting nasal cavity to the larynx: Serves as a conduit for both air and food, integrating the respiratory and digestive systems.

  • Connects oral cavity to surrounding regions: Facilitates the passage of air to the larynx and food to the esophagus, playing a critical role in proper ventilation and digestion.

Larynx

  • Opening (glottis) to the larynx serves as a passage of air: Acts as a gateway for airflow into the trachea for respiration while also containing mechanisms for voice production.

  • Houses vocal cords (voice box) for sound production: Enables phonation and plays a significant role in communication.

Trachea

  • Flexible tube connecting larynx to bronchi: Provides a clear airway for the passage of air to the bronchi, ensuring that the lungs receive a continuous supply of oxygen.

  • Purpose: Passage of air to bronchi: Acts as a conduit through which air travels to and from the lungs, demonstrating the importance of maintaining tracheal integrity for effective respiration.

Respiratory Tract

  • Lower respiratory tract includes trachea, bronchi, bronchioles, and alveoli: Each component plays a unique role in the process of respiration, from conducting air to gas exchange.

Respiratory Mechanics

  • Inhaling:

    • External intercostals contract, rib cage moves up and out, expanding the thoracic cavity.

    • Diaphragm moves down, increasing lung volume and decreasing internal pressure, which draws air in.

  • Exhaling:

    • Rib cage moves down, diaphragm moves up, decreasing thoracic cavity volume and forcing air out of the lungs.

Central Respiratory Control

  • Medulla oblongata part of the hindbrain, controls unconscious functions like:

    • Breathing: Regulates the rhythm and depth of breath automatically without conscious effort.

    • Blood Circulation: Coordinates cardiovascular responses to maintain effective perfusion during breathing.

Heart Circulation Overview

  • 3. Deoxygenated Blood Flow:

    • Blood from organs through veins to:

    • Inferior/superior vena cava

    • Right atrium

    • Right ventricle (via tricuspid valve)

    • Pulmonary valve to pulmonary artery

  • 5. Oxygenation Process:

    • Blood reaches lungs, becomes oxygenated through alveolar gas exchange, where oxygen enters the blood and carbon dioxide exits.

  • 7. Oxygenated Blood Flow:

    • Blood returns via pulmonary vein to:

    • Left atrium

    • Left ventricle (via mitral valve)

    • Aorta

Heart Valves

  • Tricuspid valve: between right atrium and right ventricle, preventing backflow of blood into the atrium during systole.

  • Mitral (bicuspid) valve: between left atrium and left ventricle, ensuring unidirectional blood flow into the ventricle.

  • Pulmonary valve: from right ventricle to pulmonary artery (semilunar valve), directing blood to the lungs for oxygenation.

  • Aortic valve: from left ventricle to aorta, facilitating oxygenated blood delivery to the body.

Heart Sounds

  • "Lub": closure of tricuspid and mitral valves, indicating the onset of ventricular systole.

  • "Dub": closure of pulmonary and aortic valves, signifying the end of ventricular systole and the start of diastole.

Pleural Anatomy and Function

  • Visceral Pleura: Inner layer covering lungs, crucial for lung protection and movement during respiration.

  • Parietal Pleura: Outer layer lining chest cavity, provides structural support and facilitates expansion of the lungs.

  • Pleural fluid lubricates layers, prevents friction: Enables smooth respiratory movements, vital for lung mechanics.

  • Pleural Friction Rub: Indicates lack of fluid; felt as a rubbing sound, often a sign of pleuritis or other pathologies.

Respiratory Assessment

  • Key for patients with:

    • Chronic respiratory/cardiac conditions ensuring ongoing monitoring of function and adaptation.

    • History of respiratory issues for assessing pre-existing vulnerabilities and prognoses.

    • Anesthesia post-surgery to evaluate recovery and respiratory function stability.

Risk Factors for Respiratory Disorders

  • Smoking and chewing tobacco: Major contributors to respiratory diseases, including lung cancer and chronic obstructive pulmonary disease (COPD).

  • Allergies: Can lead to asthma exacerbations and increased susceptibility to infection.

  • Crowded conditions increasing infection spread (e.g., flu, COVID): Prolong elevated risk for respiratory infections.

Sounds in Respiratory Assessment

  • Crackles: Indicate fluid in lungs, often associated with pneumonia or heart failure.

  • Wheezing: Associated with asthma, signifies constricted airways, difficulty breathing due to allergic reactions or infections.

Conclusion
Understanding the mechanics of breathing and heart function is vital for respiratory health assessment, aiding in the prevention and management of respiratory disorders and improving overall health outcomes.