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SUMMARY, OBJECTIVES, AND STANDARDS

Review module

05.01H The Tissues Of The Respiratory System

Structures and functions
Exchange of oxygen and carbon dioxide

Review assessment

05.01H assignment submission

By the end of this class you will

Identify the structures and functions of the alveoli
Understand gas exchange
Oxygen and carbon dioxide transport
Complete the worksheet from page 2
Successfully complete assessment submission for 05.01H

STANDARDS�SC.912.L.14.43: Describe the histology of the respiratory system.

SC.912.L.14.44: Describe the physiology of the respiratory system including the mechanisms of ventilation, gas exchange, gas transport and the mechanisms that control the rate of ventilation.

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THE LUNGS

Contain several lobes (3 on the right and 2 on the left) made up of thousands of branches of bronchia, called bronchioles
The pulmonary alveoli are small cavities grouped in bunches and surrounded by blood vessels.
Gas exchanges between air and the blood take place through the membranes of the alveoli.
The tissues of the alveoli are described as elastic, thin-walled structures that increase the surface area for gas exchange.

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GAS EXCHANGE

The alveoli are enmeshed in a network of blood capillaries, and it's here that the exchange of oxygen and carbon dioxide takes place. The oxygen and carbon dioxide pass through by simple diffusion.

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GAS EXCHANGE

lungs

blood

lungs

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GAS EXCHANGE

the gases dissolve before they diffuse through

the alveoli are very thin, wet sacs, and they have a natural tendency to collapse inwards, blocking diffusion. Without surfactant, it would be very difficult to produce enough pressure to inflate the lungs

Pulmonary surfactant is a mixture of lipids and proteins which is secreted by the epithelial type II cells into the alveolar space. Its main function is to reduce the surface tension at the air/liquid interface in the lung.

Edwin J.A Veldhuizen, Henk P Haagsman, Role of pulmonary surfactant components in surface film formation and dynamics, Biochimica et Biophysica Acta (BBA) - Biomembranes, Volume 1467, Issue 2, 2000, Pages 255-270, ISSN 0005-2736, https://doi.org/10.1016/S0005-2736(00)00256-X.

(http://www.sciencedirect.com/science/article/pii/S000527360000256X)

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LUNG TISSUES – electron micrograph

Capillary running through the alveolar space in an adult human lung.
The capillary contains red blood cells interlaced with connective tissue fibers.
Notice the thin air-blood barrier labeled in the image.

This is the location where oxygen and carbon dioxide diffuse between the lungs and the blood.

There is a water and surfactant layer overlying the air-blood barrier, but it does not show in this picture.

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05.01H ASSIGNMENT

Smoking can permanently damage the delicate tissues of the lungs. For this assessment, use the video and reliable internet resources to research which lung tissues are damaged during smoking. Use your research to explain how the damage to each of these tissues disrupts ventilation in the lungs. Your submission can be an essay or any type of presentation and should address each of the tissues presented in this lesson. Be sure to include proper references and citations for any sources you use for research.

Please review the rubric for this assignment.

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05.01H ASSIGNMENT RUBRIC

Performance Criteria	Score 4	Score 3	Score 2	Score 1
Response on tissue damage��(Multiply by 6 = 24 maximum points possible)	The response lists damage to the 1.cilia, 2.mucous membranes, 3.alveoli, 4.capillaries, and 5. surfactant and 6.water layers of the lungs, and it accurately explains how the damage to each of these tissues can disrupt ventilation in the lungs.	The response is missing less than three tissues. However, it accurately explains how the damage to each of the tissues listed can disrupt ventilation in the lungs.	The response is missing more than three tissues. However, it accurately explains how the damage to each of the tissues listed can disrupt ventilation in the lungs. ��OR ��The response lists all the tissues, but it does not accurately explain how the damage to each of these tissues can disrupt ventilation in the lungs.	The response is missing three or more tissues. ��AND ��The response does not accurately explain how the damage to each of these tissues can disrupt ventilation in the lungs.

Planning Tool for assignment 05.01H

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05.01H TIPS AND TRICKS

Use your research to explain how the damage to each of these tissues disrupts ventilation in the lungs.

“Ventilation: The exchange of air between the lungs and the atmosphere so that oxygen can be exchanged for carbon dioxide in the alveoli (the tiny air sacs in the lungs).”

Be sure to include proper references and citations for any sources you use for research.

Help Citing Sources

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