6.2 Blood System (Extra)

Question 1

What did William Harvey’s discovery on blood circulations propose?

Answer 1

• blood flow through larger vessels is undirectional, with valves to prevent backflow
• Rate of flow through major vessels was far too high for blood to be consumed in the body after being pumped out by the heart, must return to heart and be recycled
• Heart pumps blood out in arteries, Blood returns in veins
• Presence of fine vessels (too small to see) that linked arteries to veins in tissues
Blood capillaries too narrow to see