Topic: Circulatory System
Aim: Describe the structure and function of
the 3 types of blood vessels.
Do Now: Take out your reading notes.
Complete Digestive System Check Sheet
HW: Finish the Heart ISA
A
Platelets
Red blood
cells
B
White blood
cells
C
C
Did you know…
• The body of an adult contains
over 60,000 miles of blood
vessels!
• An adult's heart pumps nearly
4000 gallons of blood each day!
http://www.youtube.com/watch?v=A-HfDPJ3R00
Capillaries
Arteries
Veins
ARTERIES
• Carry blood AWAY from heart
• Have THICKER walls
• Blood flows FASTER
• HIGH pressure
• PULSE can be felt
Branching arteries in the eye
• Most carry blood WITH oxygen
Pulmonary arteries:
• Carry DEOXYGENATED blood
to the LUNGS
Coronary arteries:
• Carry OXYGENATED blood to the
myocardium (heart muscle)
Aorta:
• Largest artery Carries OXY blood
to the rest of the body
Capillaries
Arteries
Veins
VEINS
• Carry blood TO the heart
VEINS
• Have THINNER walls
• LESS pressure
• No PULSE can be felt
• Have VALVES to stop blood from
flowing backwards
• Most carry blood WITHOUT
oxygen
Pulmonary veins:
• Carry OXYGENATED from the LUNGS
back to the heart
Superior Vena Cava:
• Veins that transports DEOXYGENTATED
blood from the upper part of the body back
to the heart
Inferior Vena Cava:
• Veins that transports DEOXYGENTATED
blood from the lower part of the body back
to the heart
Coronary veins:
• Carry DEOXYGENATED blood from the
myocardium (heart muscle) to the vena
cava
Artery
Vein
Capillaries
Arteries
Veins
CAPILLARIES
• TINY blood vessels
• CONNECT arteries to veins
• Walls are very THIN
• Walls are one ONE CELL thick
• OXYGEN and NUTRIENTS need to
be able to get OUT OF the blood
• CARBON DIOXIDE and other
WASTE PRODUCTS move from the
BODY CELLS back into the BLOOD
https://www.youtube.com/watch?v=Q530H1WxtOw
ARTERIES
CAPILLARIES
VEINS
Blood vessels in the right arm and
shoulder
Arteries
of the
lower
leg &
blood
supply
to the
face &
skull
What would happen if the coronary artery that
transports oxygenated blood to the heart gets
blocked?
What would happen if the artery that
transports oxygenated blood to the brain
gets blocked?
Let’s summarize…
1. Identify the three types of blood vessels.
2. Why are arteries very muscular?
3. Identify where each type of blood vessel
carries blood.
4. Why are capillaries so thin?
5. Why do veins have valves?
6. In which blood vessel is your pulse felt?
Explain why.
https://www.youtube.com/watch?v=oiqfNHC0lG0
Review: Identify the type of blood vessel.
1. Low blood pressure VEINS
2. Where diffusion or exchange of
substances occurs. CAPILLARIES
3. Contains valves VEINS
4. Carry blood away from the heart ARTIERIES
5. Connects arteries and veins CAPILLARIES
6. Carry blood away from the heart ARTERIES
7. Red blood cells move in single file
CAPILLARIES
8. Elastic and flexible.ARTERIES
9. Used to feel pulse.ARTERIES
https://www.youtube.com/watch?v=VVJJHw_Ocp4