Chapter 3: Peripheral Circulation

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Author:
dmshaw9
ID:
298667
Filename:
Chapter 3: Peripheral Circulation
Updated:
2015-03-18 12:21:01
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Peripheral Circulation
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NPTE,Chapter3
Description:
NPTE: Chapter 3
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  1. Arteries
    • Transport oxygenated blood from areas of high pressure to low pressure in body tissues
    • Only exception = umbilical vein (in utero) and pulmonary veins
    • Influenced by elasticity and extensibility of vessel walls and by peripheral resistance (amount of blood in body)
  2. Arterioles
    • Terminal branches of arteries that attach to capillaries
    • Primary site of vascular resistance
  3. Capillaries
    • Include small blood vessel that connect the ends of arteries (arterioles) with the beginning of veins (venules)
    • Form an anastomosing network
    • Function in exchange of nutrients and fluids between blood and tissues
    • Capillary walls are thin, permeable
  4. Veins
    • Transport dark, unoxygenated blood from tissues back to heart 
    • Larger capacity, thinner walls that arteries 
    • One-way valves to prevent back flow 
    • System includes superficial and deep veins (deep veins accompany arteries while superficial veins do not)
    • Venous circulation influenced by muscle contraction, gravity, respiration (increased return with inspiration), compliancy of R heart
  5. Lymphatic System
    • Includes lymphatics (superficial, intermediate, and deep), lymph fluid, lymph tissues, and organs (lymph nodes, tonsils, spleen, thymus, and thoracic duct)
    • Drains lymph from bodily tissues and returns it to venous circulation 
    • Lymph travels from lymphatic capillaries to lymphatic vessels to ducts to L subclavian vein
  6. Lymphatic Contraction Occurs By:
    • Parasympathetic, sympathetic, and sensory nerve stimulation
    • Contraction of adjacent muscles
    • Abdominal and thoracic cavity pressure changes during normal breathing
    • Mechanical stimulation of dermal tissues
    • Volume changes within each lymphatic vessel
  7. Major Lymph Nodes
    • Submaxillary
    • Cervical
    • Axillary
    • Mesenteric
    • Iliac
    • Inguinal
    • Popliteal
    • Cubital
  8. Lymphatic System's Contribution to Immune System Function
    • Lymph nodes collect cellular debris and bacteria, remove excess fluid, blood waste, and protein molecules
    • Also produce antibodies

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