Do Now
What is this person experiencing?
• A Heart attack
• Another name for a
heart a attack is
• Angina pectoralis
•
•
•
•
Veins
Have valves
Low pressure
Thin walls (little
muscle)
• Slightly elastic
• Carry deoxygenated
blood
• Venules – smallest
vessel
• What do valves do?
• Keep blood from
flowing backwards
• Varicose veins
• Why does this occur?
• Because the valves
leak.
What helps the blood move back to
the heart besides the valves in the
veins
If you go to have your blood drawn
do doctors take the blood from a
vein or an artery?
• Arteries have very
thick and elastic walls
• High pressure
• Arterioles – small
arteries
• Carry oxygenated
blood
• Carry blood away
from the heart.
Trace a drop of blood through the
heart?
Gas exchange occurs here