Circulatory System – General Aspects. In small invertebrate organisms, no circulatory system is necessary, as diffusion distances are short.
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Fig 12.4 – Microcirculation in a closed vascular system
Fig 12.2 – Blood pressure and cross-sectional areas of the different vessels of the blood vascular system.
Fig 12.11 – Basic vertebrate blood vascular system circulation, as illustrated in a shark
Fig 12.6 – Single and double circulation circuits in vertebrates
Human Blood Smear
Neutrophil (a WBC)
Frog Blood Smear
Hemopoietic Tissues – Myeloid Tissue
Arrows = adipose cells
Arrows = developing blood cells
Fig 12.46 – Formation of lymph
Fig 12.49 – Lymphatic system in a salamander. Note the prominence of the lymph hearts for moving lymph within the lymphatic system.
Fig 12.48 – Lymphatic system in turtles
Fig 12.47 – Lymphatic circulation and lymph nodes
Valve in Lymph Vessel in mammal