22 terms

Chapter 4 Circulatory System

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circulatory system
made of the heart, blood and blood vessels
heart
muscular organ that pumps blood
atrium
the chamber of the heart that receives blood
ventricle
the chamber of the heart that pumps blood out
pacemaker
a group of cells that sends out signals to make the heart contract
valve
a flap of tissue that prevent blood from flowing backward
arteries
blood vessels that carry blood away from the heart
veins
blood vessels that carry blood to the heart
capillaries
blood vessels that connect arteries and veins
coronary arteries
carry blood to the heart itself
diffusion
molecules moving from an area of high concentration to an area of low concentration
blood pressure
the force that blood exerts against the walls of blood vessels
plasma
the liquid part of the blood
red blood cells
blood cells that carry oxygen
white blood cells
blood cells that fight disease
platelets
help form blood clots
lymphatic system
your body's drainage system
lymph
liquid in the lymphatic system
lymph nodes
filter bacteria out of lymph
atherosclerosis
a condition where artery walls are thickened by fat build up
heart attack
blood flow to the heart muscle is blocked
hypertension
a condition where a persons blood pressure is consistently high