The Circulatory System
By: Madison Reeder 6th Period 3/12/15
Components of the Circulatory System:
There are three components of the Circulatory System. They are the blood, the heart, and the blood vessels. The blood is a connective tissue made of plasma and cells. The heart is a muscular pump to move blood. And then the blood vessels which include the veins, arteries, capillaries that deliver blood to all parts of the body.
Blood:
Connective tissue made of plasma and cells.
Heart:
Muscular pump to move blood.
Blood Vessels:
Veins, arteries, capillaries that deliver blood to all parts of the body.
Blood Vessels:
- Arteries- Carry oxygen-rich blood FROM HEART to the body.
- Veins- Carry oxygen-poor blood FROM ORGANS & TISSUES to the heart.
- Capillaries- Microscopic blood vessels located between arteries and venules.
Arteries:
- Carry blood AWAY from the heart.
- Arterioles- smallest arteries.
- Have thick, strong, elastic walls.
- Carry oxygen-rich blood to ALL body cells.
Veins:
- Carry blood TO the heart.
- Have thin, elastic walls with valves.
- Valves help return blood to the heart.
- Venules- smallest veins.
- Carry oxygen-poor blood back to the heart.
Capillaries:
- Connect arteries and veins.
- Walls are ONE CELL LAYER THICK.
- Surround EVERY cell in the body.
- Site of GAS exchange.
Gas Exchange:
- Occurs between the thin walls of the alveoli and thin walls of the capillaries.
- Capillaries make up most of the vessels inside the human body.
- Blood vessels, heart, lungs all work together to being oxygen to body cells and remove carbon dioxide from the cells.
Circulatory System Bill Nye on the Heart (Part 1)