Page 1: Introduction
Respiratory Volumes and Capacities
Focused on the section 22.3 of the text.
Learning Objectives cover respiratory volumes from 22.3.1 to 22.3.4.
Page 2: Respiratory Volumes
Key Concepts
Respiratory Volumes: Amounts of air the lungs move during the respiratory cycle.
Measurement Tool: Spirometer.
Purpose: Evaluate lung ventilation.
Four Lung Volumes
Tidal Volume (TV): Air entered/exited during a normal, quiet breath.
Inspiratory Reserve Volume (IRV): Additional air inhaled during a deep breath.
Expiratory Reserve Volume (ERV): Extra air forcefully exhaled.
Residual Volume (RV): Air remaining after maximum exhalation.
Page 3: Respiratory Capacities
Understanding Capacities
Respiratory Capacities: Combinations of two or more respiratory volumes.
Importance: Indicator of air amount in lungs.
Types of Capacities
Total Lung Capacity (TLC): Maximum air lungs can hold.
Vital Capacity (VC): Maximum air moved in/out during a breath.
Inspiratory Capacity (IC): Max air inhaled post normal expiration.
Functional Residual Capacity (FRC): Air left after normal exhalation.
Page 4: Lung Volumes and Capacities
Context
Figure 22.24 related to lung volumes and capacities.
Page 5: Dead Space
Definition of Dead Space
Anatomical Dead Space: Air in airways not reaching respiratory zones.
Alveolar Dead Space: Air in non-functioning alveoli.
Total Dead Space: Combined anatomical and alveolar dead space.
Note: Air in this space does not contribute to gas exchange.
Page 6: Minute Ventilation
Minute Ventilation Concept
Minute Ventilation (MV): Total air volume entering lungs per minute.
Calculation: MV = Respiratory Rate (RR) x Tidal Volume (TV).
Alveolar Ventilation: Air reaching respiratory membranes.
Calculation involves subtracting anatomical dead space from MV.
Page 7: Activity on Emphysema
Think, Pair, Share Activity
Scenario on emphysema: Impact on lung volumes and capacities.
Page 8: Activity Response for Emphysema
Findings
Emphysema leads to reduced lung volumes and capacities due to loss of elasticity in the lungs.
Page 9: Knowledge Check Activity 2
Question
Which lung volume/capacity remains after maximal exhalation?
Options: A) Functional Residual Capacity B) Tidal Volume C) Expiratory Reserve Volume D) Residual Volume
Page 10: Knowledge Check Activity 2 Answer
Answer
Correct answer: D) Residual Volume.
Page 11: Gas Exchange Introduction
Section Overview
Focus on gas exchange, section 22.4 objectives (22.4.1–22.4.8).
Page 12: Gas Laws and Diffusion
Principles of Gas Exchange
Governing Principle: Simple diffusion.
Two important gas laws:
Dalton’s Law: Each gas in a mixture exerts partial pressure.
Henry’s Law: Diffusion is affected by partial pressure gradient and solubility.
Factors affecting diffusion
High to low partial pressure movement.
Influence of surface area and membrane thickness on diffusion.
Page 13: Dalton’s Law
Understanding Dalton’s Law
Key Points
Each gas behaves independently in a mixture.
Total pressure equals the sum of partial pressures.
Page 14: Partial Pressures Table
Overview of Gases
Examined the partial pressures of gases in atmospheric air.
Emphasizes that greater differences in partial pressures lead to faster gas movement.
Page 15: Henry’s Law
Insights into Gas Interaction with Liquids
Key Points
Explains behavior of gases in contact with liquids.
Factors affecting solubility include partial pressure gradient and gas solubility.
Oxygen: minimized solubility in plasma, while carbon dioxide has higher solubility.
Page 16: Gas Exchange Dynamics
Mechanisms of Gas Exchange in Lungs
Key Concepts
Oxygen from alveoli into pulmonary capillaries:
Alveolar oxygen partial pressure: ~100 mmHg.
Pulmonary capillary oxygen partial pressure: ~40 mmHg.
Carbon dioxide from pulmonary capillaries into alveoli for exhalation:
Alveolar CO2 pressure: ~40 mmHg.
Pulmonary capillary CO2 pressure: ~45 mmHg.
Page 17: Factors Influencing Gas Exchange
Important Factors
Surface area and functional alveoli quantity.
Partial pressure gradient size.
Membrane thickness effects (increased thickness leads to decreased diffusion).
Page 18: Continued Factors of Gas Exchange
Additional Details
Discusses the impact of conditions (like emphysema) and altitude effects on diffusion.
Page 19: Ventilation and Perfusion
Definitions
Ventilation: Movement of air in/out of lungs.
Perfusion: Blood flow in pulmonary capillaries.
Coupling mechanisms for blood flow directed to well-ventilated areas.
Page 20: Respiratory Control Summary
Components Involved
Understanding thickness and its impact on alveolar gas exchange.
Page 21: Ventilation and Perfusion Dynamics
Key Influences
Local levels of carbon dioxide, oxygen, pH, gravitational factors affecting blood flow.
Page 22: Gas Exchange at Tissues
Processes and Dynamics
Oxygen diffuses from blood into tissues; CO2 diffuses into blood from tissues.
Adequate partial pressure differences drive this exchange.
Page 23: Application Context
Asthma Overview
Chronic disease with airway inflammation and constriction.
Symptoms and treatment options (bronchodilators and steroids).
Page 24: Exploring Asthma Impact
Key Symptoms
Includes coughing, wheezing, and shortness of breath.
Mention of bronchodilators as treatments.
Page 25: Asthma Relief Medications
Medication Role
Techniques for administration and optimization of treatments.
Page 26: High Altitude Activity
Group Activity Focus
Discuss the impact of higher altitudes on gas diffusion rates using Henry’s Law.
Page 27: Answering the High Altitude Activity
Key Points
Decreased partial pressure of oxygen slows gas diffusion into blood.
Page 28: Breakout Group Activity 2
Task Description
Researching other atmospheric gases and their effects on blood transport.
Page 29: Answering Gas Transport Query
Gases Discussed
Other gases include nitrogen and carbon monoxide; limited transport due to low solubility.
Page 30: Transport of Gasses
Introduction to Key
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