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Lymphatics (Abbrev)   Student Notes
 

Lymphatics (Abbrev) Student Notes

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    Lymphatics (Abbrev)   Student Notes Lymphatics (Abbrev) Student Notes Presentation Transcript

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    • Starling Forces: Interstitial Pressures
      • Interstitial fluid pressure in most tissues is – 3. But encapsulated organs can have positive interstitial pressures (+5 to +10 mmHg).
      • Negative interstitial fluid pressure is caused by pumping of lymphatic system.
      • Two kinds of valves: (1) the walls of the lymph capillaries allow absorption of the tissue fluid through valve-like edge structures; and (2) the vessels have valves (similar to veins in limbs) are helped by both skeletal muscle action and also pulsing lymph vessel smooth muscles .
    • Lymphatic System
      • An accessory route by which fluid and protein can flow from interstitial spaces to the blood
      • Important in preventing edema
      • Lymph is derived from interstitial
      • fluid that flows into the lymphatics
      • Major route for absorption of nutrients from the GI tract
      • Plays important role in the immune system
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    • Determinants of Lymph Flow
      • The degree of activity of the lymphatic pump
          • smooth muscle filaments in lymph vessel cause them to contract
          • external compression from surrounding skeletal muscles also contributes to lymphatic pumping
      Figure 16-11; Guyton and Hall
    • Determinants of Lymph Flow Interstitial fluid hydrostatic pressure Lymph Flow Figure 16-9; Guyton and Hall Figure 16-10; Guyton and Hall
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