blood vessels

Description

AS level Biology Mind Map on blood vessels, created by Dana Davies on 01/04/2017.
Dana Davies
Mind Map by Dana Davies, updated more than 1 year ago
Dana Davies
Created by Dana Davies over 7 years ago
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Resource summary

blood vessels
  1. artery
    1. elastic layer
      1. thick
        1. keeps blood pressure high
          1. stretch and recoil prevents surges in pressure
          2. overall to resist bursting under pressure
        2. muscle layer
          1. thick
            1. smaller arterioles can be constricted + dilated
              1. control volume of blood passing through
                1. most pressure is absorbed by artery walls so less elastic fibres
            2. valves/lumen
              1. no valves as blood never flows backward bc of high pressure
            3. vein
              1. muscle layer
                1. thin
                  1. carry blood from tissues, cant control it and slower
                2. elastic layer
                  1. thin
                    1. blood pressure is low, no recoil action
                  2. valves/lumen
                    1. semi-lunar valves throughout
                      1. pressure is low so prevents backflow
                  3. capillary
                    1. numerous and highly branched + high SA
                      1. penetrate all organs and tissues
                        1. exchange between blood and cells
                        2. collects in venues then returned to veins
                          1. from arteries then arterioles
                          2. one cell thick endothelium = short DD + rapid diffusion
                            1. allows metabolic exhange
                              1. between blood and tissue fluid
                                1. flow of blood is much slower
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