Question

What are the structures and functions of the circulatory system

Answer 1

• The circulatory system transports blood around the body.
• The heart is the muscular organ that pumps the blood.
• Three types of blood vessels carry the blood.
• Arteries take blood at high pressure away from the heart and so have thick walls, but small lumens.
• Veins take blood at lower pressure towards the heart.
• They have larger lumens, but thinner walls.
• Veins have valves to stop blood flowing in the wrong direction.
• Capillaries are the smallest.
• They have walls that are only one cell thick.
• These features allow capillaries to easily exchange materials such as oxygen with nearby cells

Answer 2

The circulatory (cardiovascular) system for humans include: heart, blood, arteries and blood vessels. The heart pumps the blood through the arteries and then throughout the body by then using blood vessels.