Answer:
1.atria are thin-walled Chambers that receive blood from the veins while ventricles are thick-walled chamber that forcefully pump blood out of the heart.
2.blood vessels are the Channels or conduits through which blood is distributed to body tissues.
3.Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body while veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
4.platelets are tiny blood cells that help our body form clots to stop bleeding.
