2. Recap
This is a link to purposegames. Use this. If you cannot access
this/find it on the internet then go into BlackBoard, upload this
file and click through this link!
3. True of False (Thumbs up and
down)
1. The left side of the heart has a smaller
2.
3.
4.
5.
myocardium then the right side
There are 5 heart valves
Stroke volume is the amount of blood
ejected from the heart per contraction
Vena Cava is the largest vein
The aorta send oxygenated blood from the
heart to the lungs
4. Aims
By the end of the lesson you should be able to:
Describe the structure and function of the different blood
vessels (Task 1)
State how vasodilation and vasoconstriction occur (Task 1)
Recall diseases with blood vessels
7. Structure of Layers
Tunica Externa / Adventitia
Outer layer
Largely made up of collagen and elastin fibers
Supports blood vessel by being shock absorber
Let’s see
vasodilation and
vasoconstriction!
Tunica Media
Middle layer
Mainly smooth muscle with elastic layers and collagen
Used for vasoconstriction and vasodilation
Tunica Intima
Composed of smooth epithelial cells named endothelium
Minimises friction between moving blood
9. Artery / Arterioles
Arteries
Pumps oxygenated blood to the body
Have narrow lumens
Strong as pumping blood at high pressure
(Pinterest, 2013)
Arterioles
Branches into smaller arteries (arterioles) when nearer tissue
More smooth muscle to control blood flow
10. Capillaries
Thinnest blood vessel
Made of single layer of endothelial cells
Bring blood as close as possible to all cells
Exchange of oxygen, carbon dioxide, water, salts, between
the blood and the surrounding body tissues takes place
Large quantities cover the muscle, ensuring efficient
exchange of gases
(Pinterest, 2013)
11. (Pinterest, 2013)
Veins / Venules
Venules
Vessels formed from capillaries
Drains blood from capillaries into veins
Veins
Have same walls as artery but less thinner, elastic and
muscular
Pressure and speed of blood is low
Wider Lumen than artery
Have valves that prevent backflow of blood
12.
13.
14. Task
Let’s make some blood
You need to:
vessels
-Create a vein and artery
Play – doh
-Apply the structures we have
Scissors
discussed so far
-Represent blood vessel
disease (If you have time)
Marker pens
Straws
15. Comparison of Blood Vessels
Feature
Artery
Capillary
Vein
Tunica Externa
√
X
√
Tunica Media
Thick
X
Thinner
Tunica Interna
√
√
√
Size of Lumen
Small
Microscopic
Large
Valves
X
X
√
16. Task
What can happen if we do not look after the blood vessels?
What this video and then fill in your story board.
Tell your study buddy what you think is happening here?
This will help to give you a focus!
17. What can happen if we do not look
after the blood vessels?
Arteriosclerosis describes a
number of conditions
The thickening of the
arteries which results in
loss of elasticity
Can lead to heart attacks
and strokes
Most common form is
atherosclerosis
Build up of fatty
substances, such as
cholesterol
Results in formation of
plaque in arteries
Hypertension (High blood
pressure) can also lead o
loss of elasticity
18.
19.
20. What lifestyle changes can be made to
reduce the risk of arteriosclerosis
Give up smoking
Keep cholesterol levels at a
safe limit
Improve diet
Control weight
Reduce stress
21. Biliography
Pinterest. 2013. INFO. [online] Available at:
http://www.pinterest.com/pin/379006124862451723/
[Accessed: 2 Dec 2013].
Pinterest. 2013. Sketchbooks. [online] Available at:
http://www.pinterest.com/pin/133771051405630832/
[Accessed: 2 Dec 2013].
Pinterest. 2013. Nursing. [online] Available at:
http://www.pinterest.com/pin/273030796132827898/
[Accessed: 2 Dec 2013].
Editor's Notes
Label the diagrams in their workbooks
What is collagen?
Why does tunica media have mainly muscle?
What is vasoconstruction and vasodilation?
How does tunica intima control blood vessel diameter?
Why does the artery have more elastic tissue and smooth muscle than vein?
Copy In Workbooks
1.Why are arteries needed to be strong?
2. What is meant by high pressure?
3.Why do arterioles need to control blood flow?
1.Draw vein valves and link to varicose vein
2. Why do veins have less walls than that of artery