Respiratory System
Respiratory System (Chapter 22)
Processes of Respiration and Ventilation
Ventilation vs. Respiration: Pulmonary ventilation (breathing) is the movement of air into and out of the lungs. Respiration, on the other hand, refers to the exchange of O2 and CO2.
Types of Respiration and Locations:
External respiration: Exchange of O2 and CO2 between the lungs and blood. This occurs in the lungs.
Internal respiration: Exchange of O2 and CO2 between systemic blood vessels and tissues. This occurs at the tissue level.
Major Respiratory Organs
The major respiratory organs include the Nasal cavity, Oral cavity, Pharynx, Larynx (voice box), Trachea (windpipe), Bronchial tree, Lungs, and Diaphragm.
Figure 22.1 is not provided, so anatomical structures from this figure cannot be identified.
Upper vs. Lower Respiratory System Structures
Upper Respiratory Tract structures: The notes list the Pharyngeal tonsil, Oropharynx, Cribriform plate of ethmoid bone, Sphenoid sinus, Nasopharynx, Larynx, and other associated structures. The notes do not explicitly categorize structures into a "lower respiratory system."
Respiratory Zones
Difference between Conducting Zone and Respiratory Zone:
Respiratory zone: This is the site of gas exchange, including the respiratory bronchioles, alveolar ducts, and alveoli.
Conducting zone: These are the pathways leading to gas exchange sites. They include all other respiratory structures and function to cleanse, warm, and humidify air.
Structures in the Respiratory Zone: Respiratory bronchioles, alveolar ducts, alveoli.
Structures in the Conducting Zone: The notes state "all other respiratory structures." Based on the major respiratory organs, this implicitly includes the Nasal cavity, Oral cavity, Pharynx, Larynx, Trachea, and Bronchial tree (main bronchi and its branches).
Functional Anatomy of the Nose
Functions of the Nose:
Provides an airway for respiration.
Moistens and warms entering air.
Filters and cleans inspired air.
Serves as a resonating chamber for speech.
Houses olfactory receptors for smell.
Anatomy of the Nose:
Components: Root and bridge of nose, Dorsum nasi, Ala of nose, Apex of nose, Naris (nostril).
Skeletal Framework: Frontal bone, Nasal bone, Septal cartilage, Maxillary bone.
Figure 22.2 is not provided, so anatomical structures from this figure cannot be identified.
Tissue Types in the Nose: The notes mention Septal cartilage, Frontal bone, Nasal bone, Maxillary bone, and other connective tissues that contribute to shape and structure.
Nasal Cavity, Oral Cavity, and Pharynx
Structures:
Nasal cavity: Entrance of air into the respiratory system.
Oral cavity: Alternative pathway for air.
Pharynx: Passage connecting nasal and oral cavities to the larynx.
The "Upper Respiratory Tract" section lists: Pharyngeal tonsil, Oropharynx, Cribriform plate of ethmoid bone, Sphenoid sinus, Nasopharynx, Larynx, which are associated with these regions.
Figure 22.3 is not provided, so anatomical structures from this figure cannot be identified.
Divisions of the Pharynx: The notes specifically mention the Nasopharynx and Oropharynx. The laryngopharynx is not explicitly listed. Associated structures mentioned include the Pharyngeal tonsil, Cribriform plate of ethmoid bone, and Sphenoid sinus.
Laryngeal Anatomy
Location and Functions of the Larynx: The larynx (voice box) is a passage connecting the pharynx to the trachea. It contains vocal cords, is crucial for sound production, and acts as a passageway for air.
Figure 22.4 is not provided, so anatomical structures from this figure cannot be identified.
Laryngeal Cartilages: The notes list Thyroid cartilage (Adam's apple), Cricoid cartilage, and Epiglottis as visible structures. The total number of cartilages, their specific types (e.g., hyaline vs. elastic cartilage), exceptions, or bone attachments are not detailed.
Adam’s apple: The Thyroid cartilage forms the Adam's apple in males.
Laryngeal Folds: The two types of laryngeal folds are Vocal folds (true cords) and false cords. The Vocal folds are responsible for sound production during vibration when air passes.
Trachea and Bronchial Structure
Location of the Trachea: The trachea (windpipe) is the main airway leading to the lungs. Its precise beginning and end points are not detailed.
Tracheal Wall Composition: The three layers of the tracheal wall are the Mucosa, Submucosa, Hyaline cartilage, and Adventitia.
Tissue types in each layer: Hyaline cartilage is mentioned, and the Trachealis muscle consists of smooth muscle. The specific epithelial type for the mucosa (e.g., pseudostratified ciliated columnar) is not detailed.
Tracheal cartilages: Located within the tracheal wall and composed of Hyaline cartilage. The notes do not detail their specific C-shape, the part of the trachea lacking cartilage (e.g., posterior), or the exact location of the Trachealis muscle.
Muscle for expelling mucus: The Trachealis muscle is smooth muscle that allows adjustment of airway diameter. While it aids in expelling mucus, its explicit role in coughing is not detailed.
Carina: Not mentioned in the notes.
Bronchi: The notes mention "Branching structures (left and right main bronchi) leading to each lung." It is stated that the "Bronchial tree: Branches offer an increasing number of airways leading deeper into lung tissue."
Primary Bronchi: There are two main (primary) bronchi (left and right), each leading to a lung. The notes do not detail the number or supply of secondary (lobar) or tertiary (segmental) bronchi.
Bronchi vs. Bronchioles
The notes imply bronchi are larger airways and bronchioles are smaller, leading to the respiratory zone. A direct comparison of cartilage presence, smooth muscle abundance, or relative size is not explicitly provided.
Beginning of the Respiratory Zone: Respiratory bronchioles.
Gas Exchange Structures and Process
Location of Gas Exchange: Gas exchange occurs in the respiratory zone, specifically in the alveoli.
Respiratory vs. Terminal Bronchioles: Respiratory bronchioles are part of the respiratory zone (site of gas exchange). Terminal bronchioles are not explicitly mentioned in the notes.
Alveoli, Alveolar Ducts, and Alveolar Sacs: Alveolar ducts and alveoli are listed as components of the respiratory zone and are described as functional units for exchange. Alveolar sacs are not explicitly mentioned in the notes.
Structure of the Respiratory Membrane: The Alveolar membrane is composed of Type I alveolar cells (gas exchange) and Type II alveolar cells (surfactant production). The specific two structures fused to form this membrane (e.g., alveolar and capillary walls) are not explicitly stated.
Cell Types of the Alveolar Wall: The alveolar wall is made up of Type I alveolar cells and Type II alveolar cells. Alveolar macrophages are mentioned but not explicitly as part of the wall.
Type I vs. Type II Alveolar Cells:
Type I alveolar cells: Responsible for gas exchange.
Type II alveolar cells: Responsible for surfactant production to lower surface tension.
The notes do not specify which cells are taller.
Surfactant secretion: Type II alveolar cells.
Function of surfactant: Lowers surface tension.
Alveolar Macrophages and Pores: Not mentioned in the notes.
Blood Supply to the Lungs: Information on specific blood vessels for lung supply and their classification as pulmonary or systemic circulation is not available in the current notes.
Pulmonary Ventilation
Factors Affecting Pulmonary Ventilation: The three physical factors affecting air flow during ventilation are Airway resistance, Alveolar surface tension, and Lung compliance.
Airway resistance: Increased resistance leads to more effort for airflow.
Alveolar surface tension: Lowers compliance and affects lung expansion.
Surfactant: Surfactant, produced by Type II alveolar cells, normally keeps alveolar surface tension low.
Information regarding premature infants and related syndromes is not available in the current notes.
Respiratory Volumes and Capacities
Lung Volumes and Capacities:
Tidal Volume (TV): Amount of air exchanged during normal breathing ml.
Inspiratory Reserve Volume (IRV): Max amount of air inhaled after normal inspiration ml.
Expiratory Reserve Volume (ERV): Max air expelled after normal expiration ml.
Residual Volume (RV): Air remaining post-exhalation ml.
Vital Capacity (VC): Maximum volume of air exhaled after maximum inhalation ml.
Total Lung Capacity (TLC): Total volume of air in lungs at max ml.
Functional Residual Capacity (FRC): Volume of air in lungs after normal expiration ml.
Figure 22.18 is not provided, so identification from a spirographic record cannot be performed.
Dead Space Explanation
Dead Space Types and Relation:
Anatomical Dead Space: Air that does not reach alveoli; approximately ml.
Alveolar Dead Space: Air within non-functional alveoli.
Total Dead Space: The sum of anatomical and alveolar dead space.
Information on MVR (Minute Ventilation Rate) vs. AVR (Alveolar Ventilation Rate), which is affected by breathing rate and depth, or the breathing pattern resulting in the highest AVR, is not available in the current notes.
Gas Exchange Process and Regulation
The notes state that "Partial pressure gradients for O2 and CO2" influence external respiration. Specific partial pressure values, comparisons between alveolar and atmospheric pressures, or information on gas solubility are not provided.
Ventilation-Perfusion Coupling: This is the relationship between the air reaching alveoli (ventilation) and blood reaching alveoli (perfusion). The notes do not explicitly define the standalone differences between ventilation and perfusion or detail the coupling mechanisms, which gas regulates pulmonary arteriole diameter, or its specific effect on vessel diameter.
Information on oxyhemoglobin, deoxyhemoglobin, carbaminohemoglobin, another name for deoxyhemoglobin, or the reversibility of these reactions is not available in the current notes.
Information on hemoglobin saturation, the oxygen-hemoglobin saturation curve, or factors affecting it (temperature, PCO2, pH, shifts, Bohr effect) is not available in the current notes.
Hypoxia: Hypoxia refers to inadequate O2 reaching tissues. The notes list Hypoxia Types as Anemic, Ischemic, Histotoxic, and Hypoxemic hypoxia. Associated skin color changes are not mentioned.
Carbon Monoxide Poisoning: High affinity for hemoglobin, which competes with O2, reducing availability in tissues.
Information on the three ways of CO2 transport in the blood, its binding sites on hemoglobin, differences from O2 binding, the effect of pO2 on carbaminohemoglobin formation (Haldane effect), or its adaptive nature is not available in the current notes.
Information on the reaction of CO2 with water, the enzyme carbonic anhydrase, its location, reversibility, or the chloride shift is not available in the current notes.
Chemical Control of Breathing
Influence of CO2 on Blood pH:
Changes in breathing rate and depth adjust blood pH.
Slow/shallow breathing raises CO2, lowering pH (acidosis).
Rapid/deep breathing lowers CO2, raising pH (alkalosis).
Information on specific neurological respiratory centers in the brainstem (DRG, VRG, pons, medulla), their functions, or roles in sensory input/motor control is not available in the current notes.
The notes generally state that "Oxygen transport and utilization are critical, and the body regulates this via chemoreceptors responding to CO2 and O2 levels." However, specific details on the most powerful stimulant of respiratory drive, locations of peripheral/central chemoreceptors, their direct activators, or other stimulating/inhibiting factors are not explicitly provided.
Definitions for hyperventilation, hypercapnia, hypocapnia, or apnea are not available in the current notes.
Acclimatization and Adaptations
Acclimatization to High Altitude: The body adjusts through increased minute ventilation and production of erythropoietin (EPO) to enhance RBC count for oxygen transport, leading to sustained increased aerobic capacity.
Effect on MVR: Acclimatization results in increased minute ventilation.
Compensation for reduced Hb saturation: Production of erythropoietin (EPO) enhances the red blood cell (RBC) count for oxygen transport, compensating for reduced hemoglobin saturation.
Digestive System (Chapter 23)
Information on the digestive system (Chapter 23) is not available in the current notes, which are focused solely on the Respiratory System (Chapter 22).