Veins, arteries & capillaries

Arteries

• Carry off the blood from the heart.
• Beat at the rithm of the heart.
• Are narrow and have thick, muscular and elastic sides.
• The blood streams fast and pulsatile.
• When injured, the blood jumps out the wound.

Capillaries

• Divide the blood in the tissues.
• Do not beat.
• Are very thin and have a half permeable side.
• The blood streams slow and pulsatile.
• When injured, the blood just flows out.

Veins

• Carry the blood back to the heart.
• Do not beat.
• Are larger than arteries and have thin, less permeable sides.
• The blood streams slow and constant.
• When injured the blood just flows out.
• They have lids.