Post on 31-Dec-2015
Cardiovascular system
Cardiovascular systemall vertebrate animals have a closed circulatory system, which is called cardiovascular system.
heart, blood vessels
transport gases, nutrients, wastes
Heart
HeartFour chambersThickness of the wall Left ventricle right ventricle
Valves
Atriovantricular valve: right tricuspid valve left-bicuspid valve surpported by fibrous strings
Semilunar valve: pulmonary valve aortic valveTo prevent blood backward movement
Heart
Blood vesselsArteries: carry blood away from the heartCapillaries: exchange materials with tissue fluidVeins: return blood to the heart
Blood vesselsAorta & vena cavamajor artery & vein connected with the penisArterioles--- small arteriesVenules--- small veinsThickness of the wall: Artery vein c. Vein
Capillarycapillary beds many capillaries interconnectedcapillary wall extremely thin, red cell pass through in single file
Two major circular pathwaysPulmonary circuitblood lungs heart
Systemic circuitblood heart body
Right ventricle pumps blood to lungsSuperior/inferior vena cava carry deoxygenated blood
Left ventricle pumps blood to the bodyPulmonary veins carry oxygenated blood from lungs
Systemic capillary exchange
Dissect heart and identify four chambers and valves