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no circulatory system
gastrovascular cavity functions in digestion and distribution of nutrients (cnidarians and planarians)
Functions of circulatory system
transport of O2 and CO2, distribution of nutrients, transport of waste, distribution of hormones, regulation of body temp, protection of the body against blood loss, protection of the body against disease
Arteries and Arterioles
thick walls, smooth muscle with elastic tissue to withstand high pressure
carry blood away from the heart
thin single cell endothelium (epithelium)
exchange of materials between blood and body cells
blood circulation order
Heart--> arteries -->arterioles --> capillaries --> venules --> veins --> back to heart
distribution of Blood Heart output
digestive tract (21 %)--> Liver (6%) --> kidneys (20%) -->Skeletal muscle (15%)
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