BIOS 255 EXAM 2 ACTUAL TEST PAPER QUESTIONS AND CORRECT ANSWERS COMPLETE SOLUTION GUIDE

BIOS 255 EXAM 2 ACTUAL TEST PAPER
QUESTIONS AND CORRECT ANSWERS
COMPLETE SOLUTION GUIDE

●● Pulmonary arteries
Answer: Carries deoxygenated blood to the lungs.


●● Umbilical artery
Answer: carries deoxygenated blood away from fetus


●● Veins
Answer: carry blood back to the heart; deoxygenated


●● Pulmonary Veins
Answer: Carry oxygenated blood from lungs to heart.


●● Umbilical Veins
Answer: carries oxygenated blood from mother to fetus


●● Capillaries
Answer: Connect smallest arteries to smallest veins to create a circuit

,●● functions of capillaries
Answer: Thin walls allow exchange of gases & nutrients with tissues.


●● Tunica interna(tunica intima)
Answer: innermost lining of vessel


●● What is tunica interna made of?
Answer: Simple squamous epithelium (endothelium)


●● Tunica Medica
Answer: Middle layer


●● What is the tunica media?
Answer: Smooth muscle contracts to determine diameter of vessel


●● Tunica externa (tunica adventitia)
Answer: outermost layer


●● What is the Tunica externa?
Answer: Connective tissue, anchors vessel in place

, ●● Elastic arteries
Answer: largest arteries


●● Example of elastic arteries
Answer: aorta
iliac arteries


●● Distributing/muscular arteries
Answer: Smaller branches to specific organs


●● Example of distributing/muscular arteries
Answer: Renal, hepatic, femoral


●● Resistance Arteries
Answer: (small) Variable, don't have individual names


●● Arterioles
Answer: Smallest of resistance arteries, only 1-3 layers of muscle


●● What are arterioles
Answer: directly controls how much blood reaches a specific organ or
tissue