transport blood from the heart
transport blood to the heart
control blood flow through each organ
are the vessels where diffusion takes place
1) drainage, 2) absorption, 3) delivery of pathogens
no circulatory system
gastrovascular cavity functions in digestion and distribution of nutrients (cnidarians and planarians)
open circulatory system
blood not always in vessels (hemolymph = blood + interstitial fluid)
closed circulatory system
blood always in vessels. (earthworm, squids, octopuses and vertebrates)
1)fluid blood, 2) a system of channels (vessels), 3) A pump (heart)
leukocytes (white blood cells)
5,000-10,000 per mm^3
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
venules and veins
one way valves in thin walled vessels.
returns blood to the heart
blood circulation order
Heart--> arteries -->arterioles --> capillaries --> venules --> veins --> back to heart
a receiving chamber
pumping chambers --> arteries
pick up o2
deliver nutrients, O2, etc.
LV --> body tissue --> RA --> RV
distribution of Blood Heart output
digestive tract (21 %)--> Liver (6%) --> kidneys (20%) -->Skeletal muscle (15%)
sends signals to walls of atria (to contract) is also sends signals to the AV node
sends signals to ventricle muscles --> ventricles contract.
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