| A | B |
|---|
| blood vessels | Blood is carried in a system of tubes or pipes in your body |
| circulatory system | Blood, blood vessels and heart bring nutrients and oxygen to all the cells of your body. |
| Heart | a powerful muscle that pumps blood to all parts of your body |
| heart rate | the number of times your heart beat in one minute |
| blood | delivers nutrients, minerals and other substances that your body's cells need for life |
| plasma | liquid part of the blood; makes up about 1/2 of your blood |
| red blood cells | pick up oxygen in the lungs and take it to all the cells |
| white blood cells | protect the body from disease by keeping germs and infections out of the body |
| platelets | special type of white blood cell used in clotting |
| human body blood vessels | 60,000 miles of vessels in an adult's body |
| arteries | carry blood from the heart to your cells |
| capillaries | smallest, thinnest, numerous blood vessels |
| veins | blood vessels that carry blood from the capillaries back to your heart |
| heart attack | happens when a part of the heart doesn't get enough oxygen rich blood |
| healthy food and exercise | necessary to keep your heart healthy |
| smoking | causes heart attacks |
| during exercise | cells need more energy |
| pacemaker | invention that is implanted that controls the heart's rhythm |
