The heart
Classified in Biology
Written at on 
English with a size of 1.96 KB.
CIRCULATORY SISTEM
CARRIES SUBSTANCES VIA THE BLOOD WICH CIRCULATES THROUGH VESSELS AND IS PUMPED BY THE HEART
ARTERIES THICK ELASTIC WALLS THEY CARRY THE BLOOD FROM THE HEART TO THE ORGANS THEY BRANCH OFF INTO OTHER SMALLER ARTERIES CALLED ARTERIOLES
VEINS THINNER LESS ELASTIC WALLS PREVENT BLOOD FROM FLOWING BACKWARDS THEY CHANNEL THE BLOOD FROM THE ORGNS TO THE HEART THEY ARE FORMED BY THE JOINING OF SMALL VEINS CALLED VENULES
CAPILLARIES MICROSCOPIC BLOOD VESSELS THAT REACH ALL THE CELLS
THEIR WALLS ARE VERY THIN AND ALLOW NUTRIENTS GASES AND WASTE TO BE EXCHANGED BETWEEN THE BLOOD AND THE CELLS
SUPERIOR VENA CAVA AORTA
RIGHT ATRIUM PULMONARY ARTERY
TRICUSPID VALVE PULMONARY VEINS
INFERIOR VENA CAVA LEFT ATRIUM
RIGHT VENTRICLE MITRAL VALVE
SEMILUNAR VALVES
LEFT VENTRICLE
SYSTOLE THE ATRIA CONTRACT
VENTRICULAR VENTRICULES CONTRACT
DIASTOLE ATERIES AND ATRIA DILATE