Intro to Circulatory System

The thickest and strongest blood vessel is the

• vein

• artery

• capillary

• both veins and capillaries

The blood vessel that has the largest diameter is

• vein

• artery

• capillary

Valves in veins

• support them

• protect them

• prevent the backward movement inside them

• provide them elesticity

Carry blood away from heart; mostly oxygen-rich

• Arteries
• Veins
• Capillaries

What type of tissue lines and protects parts of your body that interact with the outside environment or substances moving past ? (There are layers of this around the outside and inside of each blood vessel)

• Muscle tissue

• Epithelial Tissue

• Nervous Tissue

• Connective Tissue

This type of muscle tissue is found in the walls of blood vessels and hollow organs such as the stomach; their movement is to squeeze- making their tube smaller or bigger

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

Carry blood toward heart; mostly oxygen-poor

• Arteries
• Veins
• Capillaries

These are one cell thick

• arteries

• capillaries

• veins

Thin-walled vessels that allow for the exchange of O_{2 ,} CO₂, nutrients and wastes between blood and the cells they are moving past/delivering to (or air sacs in the lungs)

• Arteries
• Veins
• Capillaries

The blood that enters the heart is ____ (so we show it as blue in many diagrams)

• low in oxygen (does not have much oxygen)

• is oxygen rich (has a lot of oxygen)