HBIO 301 CHAPTER 20 EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
LATEST UPDATE
What is the vaso vasorum?
Supplies very large veins with their own blood supply
Overcomes the little amount of diffusion that happens from the middle of the artery/vein
to the outside
Are arteries or veins more elastic?
Arteries because they have to put up with higher BP going through them
What does contractility of arteries do?
Changes vessel diameter via sympathetic division of ANS
What is vasoconstriction?
Contraction of arterial smooth muscle, shrinks lumen
What is vasodilation?
Relaxation of arterial smooth muscle, enlarges lumen
Do veins or arteries have a larger diameter?
Veins
Do veins or arteries have thinner walls?
Veins
What does sympathetic stimulation of veins do?
, causes veins to vasoconstrict and divert blood to skeletal muscles instead of pooling
What has a higher capacitance, veins or arteries? What does this mean?
Veins
Can distend 8X more
Lower elasticity = higher capacitance
What are the largest arteries? What are mid sized arteries? What are the smallest
arteries?
largest = elastic
middle = muscular
smallest = arterioles
What is another name for elastic arteries?
Conducting arteries
What are examples of elastic arteries?
Pulmonary trunk, aorta
Which arteries have all 3 layers?
Elastic and muscular
Which arteries have a very thick tunica media?
Muscular
What is another name for muscular arteries?
Distribution arteries
What type of arteries are most common?
Muscular
What layer(s) are arterioles missing?
ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
LATEST UPDATE
What is the vaso vasorum?
Supplies very large veins with their own blood supply
Overcomes the little amount of diffusion that happens from the middle of the artery/vein
to the outside
Are arteries or veins more elastic?
Arteries because they have to put up with higher BP going through them
What does contractility of arteries do?
Changes vessel diameter via sympathetic division of ANS
What is vasoconstriction?
Contraction of arterial smooth muscle, shrinks lumen
What is vasodilation?
Relaxation of arterial smooth muscle, enlarges lumen
Do veins or arteries have a larger diameter?
Veins
Do veins or arteries have thinner walls?
Veins
What does sympathetic stimulation of veins do?
, causes veins to vasoconstrict and divert blood to skeletal muscles instead of pooling
What has a higher capacitance, veins or arteries? What does this mean?
Veins
Can distend 8X more
Lower elasticity = higher capacitance
What are the largest arteries? What are mid sized arteries? What are the smallest
arteries?
largest = elastic
middle = muscular
smallest = arterioles
What is another name for elastic arteries?
Conducting arteries
What are examples of elastic arteries?
Pulmonary trunk, aorta
Which arteries have all 3 layers?
Elastic and muscular
Which arteries have a very thick tunica media?
Muscular
What is another name for muscular arteries?
Distribution arteries
What type of arteries are most common?
Muscular
What layer(s) are arterioles missing?
