Gas exchange

HEALTH & EXERCISE

Module 8

Breathing and Gas Exchange

The Human Thorax

How the structure of the thorax enable ventilation of the lungs and gas exchange.

Trachea, cartilage rings, bronchi, bronchioles, alveoli, diaphragm, ribs, intercostal muscles

Trachea

Trachea – surrounded by cartilage rings that keep the tube open

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Rib – provides protection for lungs and heart

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Rib – provides protection for lungs and heart

Right lung

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Rib – provides protection for lungs and heart

Right lung

Right bronchus

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Rib – provides protection for lungs and heart

Right lung

Right bronchus

Alveoli (air sacs), site of gas exchange

Trachea – surrounded by cartilage rings that keep the tube open

Left lung

Left bronchus, the major division of the trachea as it enters the lungs

Bronchiole – a smaller branch off the larger bronchus

Heart – responsible for pumping blood around the body

Rib – provides protection for lungs and heart

Right lung

Right bronchus

Alveoli (air sacs), site of gas exchange

Intercostal muscles lift ribs up & out

Gas Exchange in the alveoli

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

the blood carries oxygen to the cells

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

the blood carries oxygen to the cells

cells of the body use oxygen for respiration

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

the blood carries oxygen to the cells

cells of the body use oxygen for respiration carbon dioxide goes

into the blood

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

the blood carries oxygen to the cells

cells of the body use oxygen for respiration carbon dioxide goes

into the blood

the blood carries carbon dioxide to the lungs

Gas Exchange in the alveoli

Oxygen from the air in the alveoli diffuses into the blood. At the same time, carbon dioxide from the blood diffuses into the alveoli.

Oxygen dissolves in the moist lining

Oxygen diffuses into the blood

the blood carries oxygen to the cells

cells of the body use oxygen for respiration carbon dioxide goes

into the blood

the blood carries carbon dioxide to the lungs

carbon dioxide diffuses into the alveoli

Breathing

Breathing

Breathing in (inspiration)

Breathing

Breathing in (inspiration)

intercostal muscles contract

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

air rushes in

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

Breathing out (expiration)intercostal muscles relax

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

Breathing out (expiration)intercostal muscles relax

rib cage moves down and in

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

Breathing out (expiration)intercostal muscles relax

rib cage moves down and in

diaphragm becomes dome-shaped when the muscle relaxes

Breathing

Breathing in (inspiration)

intercostal muscles contract

rib cage moves up and out

diaphragm becomes flatter when the muscle contracts

intercostal muscles relax

rib cage moves down and in

diaphragm becomes dome-shaped when the muscle relaxes

air is pushed out