The human lung
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The Human Lung. Energy Needs. The body consists of trillions of “engines” Each cells needs glucose and oxygen The lungs serve as the supplier of oxygen. Energy Byproducts. In the body glucose is the main source of energy

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Energy needs l.jpg
Energy Needs

  • The body consists of trillions of “engines”

  • Each cells needs glucose and oxygen

  • The lungs serve as the supplier of oxygen


Energy byproducts l.jpg
Energy Byproducts

  • In the body glucose is the main source of energy

  • Carbon Dioxide is the main byproduct and is released from the blood by the lungs

  • C02 drives the breathing rate – not oxygen


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Other Functions of the Lungs

  • Exchange of 02 and C02

  • Keeps the bodies pH (acid) constant

  • Moistuizes the air

    • We can “see” our breath in the winter

  • Play a role in heat exchange

  • Voice production (power of 1mW)

  • Air for yawning sighing, laughing, sniffing


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Breathing

  • We breath about 6 liters of air per minute

    • This is about the same as the heart pumps

  • Men breath about 12/minute

  • Women breath about 18/minute

  • Infants breath abut 60/minute



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The lungs have a large surface area

The convoluted surfaces have a surface area of 80m2

This is about ½ the size of a tennis court


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The lungs have a greater exposure to the environment than any other part of the body – including the skin.

The air we breath contains dust, smoke, bacteria, noxious gases

All come in contact with the blood.


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The trachea divides in the right and main stem bronchus any other part of the body – including the skin.

Each bronchus then divides 15 more times

The terminal bronchioles supply air to millions of small sacs called alveoli


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At birth the lungs have 30 million any other part of the body – including the skin.

At age 8 the number is about 300 million

That is about 100,000/day increase

They stay pretty constant after that

Alveoli


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They act as tiny interconnected bubbles. any other part of the body – including the skin.

They are 0.2 mm in diameter

The walls are 0.4 micrometers thick

Alveoli


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Each alveolus is surrounded by blood so that 0 any other part of the body – including the skin. 2 and C02 can exchange


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The airways must be able to remove particles. any other part of the body – including the skin.

The body does this in two ways

1. Coughing removes large particles


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2. Small particles are carried upward by millions of small hairs called cilia.

They vibrate about 1000/minute

Mucous moves 1 – 2 cm/minute

It takes 30 minutes to be cleared.


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This is a lung disease that occurs when cilia are unable to move

Individuals have abnormal or absent ciliary motion.

Kartagener's Syndrome is also called Immotile Cilia Syndrome

Kartagener's Syndrome


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