The components of the circulatory

system that transports blood throughout the human body

Carry the blood away from the heart

Are small branches of an artery

leading into capillaries

Where the exchange of water and

chemicals between the blood and the tissues occur

carry blood from the capillaries back

towards the heart

the smallest veins and receive blood from capillaries

what are the main types of blood vessels?

• Arteries

• Veins

• Capillaries

• Arterioles

• Venules

3 Major layers of the vein and artery

• Tunica intima

• Tunica media

• Tunica externa

• Tunica adventitia

Tunica _______ is the innermost and thinnest layer. It is composed of simple squamous epithelial cells for easier diffusion of gases. Interlaced with several circularly arranged elastic bands called internal elastic lamina.

• intima

• media

• externa

• adventitia

Tunica _______ is the thickest layer in the arteries. Consists of circularly arranged elastic fiber, connective tissue, and polysaccharide substances the second and third layers are separated by another thick elastic band called external elastic lamina.

• intima

• media

• externa

• adventitia