BIOS 255 Exam 2 - Answer Answer: tunica externa 2. the middle and...

BIOS 255 Exam 2

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BIOS 255 Exam 2

• outer layer of a blood vessel, contains epithelial cells, connective tissue, and elastic fiber

Answer

Answer: tunica externa

• the middle and thickest layer of the blood vessel, contains elastic fibers and smooth muscle

Answer: tunica media

• tunica media

Answer: usually the largest layer of a blood vessel and controls the diameter

• the innermost layer of a blood vessel, contains endothelial cells and connective tissue

Answer: tunica intima

• largest arteries by diameter, contain more elastic fibers than smooth muscle

Answer: elastic/ conducting arteries

• contain large amounts of smooth muscle

Answer: muscular/ distributing arteries

• smallest arteries by diameter, attached to the capillary beds

Answer: resistance arteries/ arterioles

• weak point in the wall of a blood vessel, bulging sac that pulsates with each heartbeat

Answer: aneurysm

• tight junctions, creating a continuous and uninterrupted lining, small gaps for exchange of

gases via simple diffusion

Answer: continuous capillaries

• contains pores fenestrations; allows for slightly larger molecules to filter; found in places

like the kidney

Answer: fenestrated capillaries

• large openings allow the passage of larger molecules such as proteins and formed elements;

found in the liver

Answer: sinusoidal capillaries

• contain valves, rely on venules, medium sized veins, and large veins to create pressure to

assist in returning blood to the heart, carry deoxygenated blood

Answer: veins

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