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transport blood from the heart


transport blood to the heart


control blood flow through each organ


are the vessels where diffusion takes place

lymphatic system

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)

circulatory system

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

pulmonary circuit

pick up o2

systemic circuit

deliver nutrients, O2, etc.
LV --> body tissue --> RA --> RV

distribution of Blood Heart output

digestive tract (21 %)--> Liver (6%) --> kidneys (20%) -->Skeletal muscle (15%)

SA node

sends signals to walls of atria (to contract) is also sends signals to the AV node

AV node

sends signals to ventricle muscles --> ventricles contract.

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