B4.2 Flashcards
1
Q
How does blood flow around the body and what are they called
A
It moves through blood vessels. The main types are called arteries, veins and capillaries
2
Q
How do substances diffuse in our body
A
They diffuse in and out of our blood in capillaries
3
Q
What do valves do
A
They prevent back flow ensuring the blood flows in the right direction
4
Q
How many circulatory systems do human beings have
A
A double circulatory system
5
Q
Arteries vs veins
A
Arteries carry the blood away from the heart. They are thick because they need to hold the pressure and if they burst, we can easily die as lots of blood is flowing.
Veins carry the blood to the heart and are less thicker as there is less pressure on them
