1.2.1

Pathway of Air

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Adaptations of the Lungs for Gaseous Exchange

The lungs have the following adaptations to make sure efficient gaseous exchange takes place:

Contain alveoli

Contain alveoli

  • There are millions of alveoli (air sacs) in each lung (approximately 150 million in each).
  • The alveoli have the following adaptations for gaseous exchange:
    • They are only 1 cell thick, meaning that there's a short distance for the oxygen to travel.
    • They are moist.
Good blood supply

Good blood supply

  • There is a very good blood supply to the lungs. This means that there are plenty of capillaries (blood vessels) surrounding the alveoli for diffusion to take place.
Large surface area

Large surface area

  • Because each bronchiole contains a cluster of alveoli, there is a large surface area for diffusion to happen over. This lets the blood absorb more oxygen.
  • The capillaries are only 1 cell thick and wrap tightly around the alveoli, so the distance for diffusion remains small.

Gaseous Exchange in the Lungs

For diffusion to happen, there must be a difference in the concentration of a gas in the alveoli and in the blood. The gas will diffuse from the area of higher concentration (more particles) to the area of lower concentration (fewer particles).

Oxygen

Oxygen

  • Oxygen travels from the alveoli into the blood because:
    • There is a high concentration of oxygen in the alveoli.
    • There is a low concentration of oxygen in the blood.
Carbon dioxide

Carbon dioxide

  • Carbon dioxide travels from the blood into the alveoli because:
    • There is a high concentration of carbon dioxide in the blood.
    • There is a low concentration of carbon dioxide in the alveoli.
Haemoglobin

Haemoglobin

  • Red blood cells carry haemoglobin, which transports gases around the body.
    • Haemoglobin carries carbon dioxide from the body to the alveoli in the lungs.
    • Oxygen binds with haemoglobin to make oxyhaemoglobin. This is transported through the blood to the tissues around the body.
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1

Applied Anatomy & Physiology

1.1

The Musculoskeletal System

1.1.1Musculoskeletal Structure1.1.2Structure of the Skeleton1.1.3Functions of the Skeleton1.1.4Joints1.1.5Joints 21.1.6Antagonistic Muscle Movement1.1.7End of Topic Test - The Musculoskeletal System1.1.8Exam-Style Questions - Musculoskeletal System1.1.9Diagnostic Misconceptions - Contractions
1.2

The Cardio-Respiratory System

1.2.1Pathway of Air1.2.2Blood Vessels1.2.3Blood Vessels 21.2.4Structure of the Heart1.2.5Cardiac Cycle1.2.6Measures of Heart Performance1.2.7The Mechanics of Breathing1.2.8The Mechanics of Breathing 21.2.9The Lungs1.2.10End of Topic Test - The Cardio-Respiratory System1.2.11Exam-Style Questions - Cardio-Respiratory System1.2.12Diagnostic Misconceptions - Pathway of Blood1.2.13Diagnostic Misconceptions - Cardiac Output
1.3

Anaerobic & Aerobic Exercise

1.3.1Aerobic & Anaerobic Respiration1.3.2Recovering After Exercise1.3.3Treatments for Recovery1.3.4Diagnostic Misconceptions - Aerobic vs Anaerobic
1.4

Short-Term Effects of Exercise

1.4.1Short-Term Effects of Exercise1.4.2Long-Term Effects of Exercise
2

Movement Analysis

2.1

Lever Systems

2.1.1Lever Systems2.1.2Mechanical Advantage2.1.3Basic Sporting Movements2.1.4Basic Sporting Movements 22.1.5Diagnostic Misconceptions - Types of Lever Systems
2.2

Planes & Axes of Movement

2.2.1Planes & Axes of Movement2.2.2End of Topic Test - Movement Analysis2.2.3Exam-Style Questions - Movement2.2.4Diagnostic Misconceptions - Planes vs Axes
3

Physical Training

3.1

Health & Fitness

3.1.1Health & Fitness
3.2

The Components of Fitness

3.2.1The Components of Fitness3.2.2Sports & Fitness3.2.3Fitness Testing3.2.4Measuring Agility & Balance3.2.5Measuring Cardiovascular & Coordination3.2.6Measuring Endurance & Power3.2.7Measuring Reaction Time & Strength3.2.8Measuring Strength, Speed & Flexibility3.2.9End of Topic Test - The Components of Fitness3.2.10Exam-Style Questions - Fitness Tests
4

The Principles of Training

4.1

Principles of Training

4.1.1Principles & Circuit Training4.1.2Continuous & Fartlek Training4.1.3Plyometric & Static Training4.1.4Weight & Interval Training4.1.5Diagnostic Misconceptions - Types of Training
4.2

Optimising Training

4.2.1Optimising Training4.2.2Altitude & Seasonal Training4.2.3Warming Up4.2.4Cooling Down4.2.5End of Topic Test - Principles & Optimisation4.2.6Exam-Style Questions - Sport-Specific Fitness
5

Using Data

5.1

Types of Data

5.1.1Quantitative Data5.1.2Qualitative Data
5.2

Data Presentation & Analysis

5.2.1Data Presentation & Analysis
6

Sports Psychology

6.1

Skills

6.1.1Skills6.1.2Skills 26.1.3Goals & Targets6.1.4Skills HyperLearning
6.2

Feedback & Preparation

6.2.1Information Processing6.2.2Guidance6.2.3Guidance 26.2.4Feedback6.2.5Mental Preparation6.2.6Controlling & Optimising Arousal6.2.7Exam-Style Questions - Skills & Guidance
6.3

Personality & Behaviour

6.3.1Aggression6.3.2Motivation6.3.3Personality Types6.3.4End of Topic Test - Sports Psychology6.3.5Exam-Style Questions - Aggression & Motivation6.3.6Diagnostic Misconceptions - Aggression
7

Socio-cultural Influences

7.1

Engagement Patterns of Different Social Groups

7.1.1Engagement - Gender7.1.2Engagement - Ethnicity7.1.3Engagement - Age & Family7.1.4Engagement - Disability
7.2

Commercialisation

7.2.1Media7.2.2Commercialisation7.2.3Commercialisation 27.2.4Sponsorship7.2.5Arguments for Sponsorship7.2.6Impact of Sponsorship7.2.7End of Topic Test - Engagement & Commercialisation7.2.8Exam-Style Questions - Commercialisation & Conduct
7.3

Ethical & Socio-cultural Issues

7.3.1Impact of Technology on Performers7.3.2Impact of Technology on Performers 27.3.3Impact of Technology on Sport7.3.4Impact of Technology on Sport 27.3.5Sporting Conduct & Banned Substances7.3.6Blood Doping7.3.7Drug Restrictions7.3.8Drug Restrictions 27.3.9Spectator Behaviour7.3.10End of Topic Test - Ethical Issues7.3.11Exam-Style Questions - Performance Enhancing Drugs7.3.12Diagnostic Misconceptions - Conduct in Sport
8

Health & Fitness

8.1

Overview of Health

8.1.1Well-Being & Fitness8.1.2Types of Health
8.2

Sedentary Lifestyles

8.2.1Sedentary Lifestyle8.2.2Obesity & Performance8.2.3Somatotypes8.2.4Diagnostic Misconceptions - Somatypes
8.3

Nutrition & Hydration

8.3.1Nutrition8.3.2Nutrition 28.3.3Hydration8.3.4End of Topic Test - Health & Fitness8.3.5Exam-Style Questions - Nutrition & Hydration

Practice questions on Pathway of Air

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  1. 1
    The Pathway of AirPut in order
  2. 2
    What do we call the tiny air sacs found at the end of the bronchioles in the lungs?Multiple choice
  3. 3
    What is the technical term for the windpipe?Multiple choice
  4. 4
    Adaptations of alveoli for gaseous exchangeTrue / false
  5. 5
    How many alveoli are there in each lung?Multiple choice
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Diagnostic Misconceptions - Contractions

Blood Vessels