Lymphatic System

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Lymphatic System
Notes

• Chapter 37
• Section 2

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Lecture Outline Lymphatic System
PowerPoint Notes
textbook questions
Keys
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Crucial in helping the body ward off disease and
heal from injury
Advanced infection from poor circulation
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The lymphatic system is closely linked to several
other systems
But especially to the Circulatory System
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Function

• 1. Collects fluid lost from the blood and returns
  it to the circulatory system
• More than three liters of fluid leave the
  capillaries each day
• This continually bathes the cells
• There is twice as much lymph in the body as blood
• Lymph is dumped back into the circulatory system
  thru the superior vena cava

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Functions contd

• 2. Filters fluid to rid it of bacteria and other
  pathogens

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More Functions

• 3. Collects fat from the small intestine and
  delivers it to the circulatory system
• 4. Generates and stores WBCs called
  lymphocytes that fight infection

Notice the location of the nodes
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Components of the Lymphatic System

• A. Lymph fluid collected in lymph vessels
• Clear straw colored fluid same basic component
  as plasma

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• B. Lymph vessels structures that collect lymph
  and deliver it back to the circulatory system
• Valves within keep the lymph moving in one
  direction

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• C. Lymph nodes series of cleaning filters
• Lymph moves slowly through the nodes
• WBCs attack and engulf bacteria and pathogens
  in nodes

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• Location of vessels and nodes

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Nodes swell when large numbers of pathogens are
trapped

• The swelling can cause pain like a sore throat
• Have you ever had tonsillitis?

Did it look like this?
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Edema

• Swelling of tissues due to excess fluid
  accumulation
• Caused by disease or injury

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• Elephantiasis
• a condition of extreme edema that occurs when
  lymph vessels become blocked by filarial worms.