12. In which of the following vessels would you see the thickest tunica media? a
ID: 3513339 • Letter: 1
Question
12. In which of the following vessels would you see the thickest tunica media? a. aorta d. pulmonary artery e coronary sinus 13. All of the following statements are true, EXCEPT: a. veins are called capacitance vessels because they store large amounts of blood b. arteries have thick tunica media to better deal with high pressure c valves are modi fications of veins to better deal with low pressure d. veins deliver blood to the heart, while arteries take blood away from the heart e. sinusoid capillaries have very thin tunica intima, media and adventitia 14. Propanolol is a drug that blocks beta receptors. Which of the following is are the likely effects of this drug? a. decrease heart rate b. decrease blood pressure c decrease vasoconstriction d. All of the above e. A and B only 15. Which of the following is closest to the lumen of the blood vessels? a. tunica intima b. external elastic lamina c. tunica media d. tunica adventitia e. tunica extena 16. Which of the following does NOT belong with the others? I. epinephrine 2. angiotensin 3. ADH 4. aldosterone 5. atherosclerosis a. 1 and 2 b. 3 only c. 2 and 4 d. 5only e 1,3 and 4Explanation / Answer
Answers:
12) a
Tunica media is the middle layer of a blood vessel. It is composed of elastic and smooth muscles arranged in a circular fashion and is seen thickest in arteries.especially in large arteries such as the aorta.
13) d
Sinusoid capillaries are a type of capillaries with fenestrated endothelium. They do not have characteristic layers seen in bigger vessels.They are also known as open pore capillaries.
14) e
Propranolol is a non-selective beta blocker. It is used to treat hypertension due to its beta 1 activity. beta receptors tend to cause vasodilation so a beta blocker like propranolol can more likely cause vasoconstriction and not decrease it.
15) a
Of the three main layers of blood vessels, tunica adventitia lies on the outer aspect. tunica media forms the middle layer and tunica intima is found closer to the lumen.
16) d
Atherosclerosis is a pathological state of the blood vessels characterized by fatty deposition on its inner walls causing it to narrow the remaining options are the various hormones produced in the body for its normal functioning.
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