1. What can you remember?
1. How many chambers does the heart have?
2. What are the chambers called?
3. Which side of the heart pumps blood around the body?
4. What does pulmonary mean?
5. What do the valves do?
6. What stops the valves from operating as “double doors”?
7. Which vessel carries blood from the heart to the cells
around the body?
8. Which vessels carries the deoxygenated blood back to the
heart?
9. Why is the cardiac system called a double system?

2. Keeping the blood flowing
• All will know the three main types of blood
vessels and their function
• Most will be able to describe the adaptations
of each vessel
• Some will be able to evaluate the methods
used to repair blocked vessels

3. Circulatory questions
1. What are the three elements of the
circulatory system?
2. Humans have a double circulatory system.
What does this mean?
(draw fig 1 p.238)
3. What are the three types of blood vessels?

4. • What is the total length of blood
vessels in the average adult
human body?
• 100,000 Km

5. blood from blood to the
the heart heart
artery vein
carries blood carries blood
away from back into
the heart the heart
carries blood to
and from the
body’s cells

6. • Artery
thick outer wall
thick inner layer
of muscle and
elastic fibres
narrow
lumen

7. • Vein
thin outer wall
thin inner layer
of muscle and
elastic fibres
wide
lumen

8. Blood travels back to the heart in veins at low pressure.
If the blood pressure is too low, what, for example, might
happen to the blood in leg veins?
blood
to the
heart possible
backflow
of blood
gravity
If low-pressure blood has to move against gravity, it might
slow down further and even flow in the wrong direction!

9. backflow
vein valve prevented
open
vein valve
blood to closed
the
heart
When blood flows along veins If blood in a vein does flow
it pushes past backwards,
the valves, which can it is trapped by
only open in one direction. closed valves.

10. Keeping the blood flowing
• Capillaries

11. Blood vessels
1. Draw the 3 blood vessels
2. Complete the card sort and record in your
books

12. Keeping the blood flowing
What could go wrong
with the heart?

13. • Copy the headings for the following table into
your books
What is a When is a stent Advantages of Disadvantages
stent? used? using a stent of using a stent
Before
reading
After first
reading
After
second
reading

14. • Complete the first line of the table – it doesn’t
matter if you don’t know!
• Now read (and only read) the information on
stents.
• Complete row 2 of your table
• Now read again
• Complete row 3!

15. • Now write a paragraph explaining what a stent
is and how a stent works for an adult who has
a blocked artery. Don’t forget to include any
advantages and disadvantages!