BIO 169 Exam 1 Questions and
Answers
Which of the following are important sources of resistance to blood flow?
✓ ~~~All of the Above
A _________ allows an organ to recieve blood from more then one arterial source or
drain blood into more then one vein.
✓ ~~~vascular anastomoses
Arteries can be best defined as
✓ ~~~vessels that carry blood away from the heart.
A decrease in hematocrit will result in a decrease in ____________ resulting in a
decrease in blood pressure.
✓ ~~~blood viscosity
The systolic pressure
✓ ~~~all of the above
Unlike most organs when an area of the lungs has a low oxygen content, perhaps
because of disease or damage to the tissue, the blood vessels in that area
✓ ~~~undergo vasoconstriction so less blood will reach those tissues.
Vasodilation
, ✓ ~~~is an increase in the diameter of a blood vessel.
Which of the following is a correct statement concerning continuous capillaries?
✓ ~~~constitute the blood-brain barrier
What is the relationship between the velocity blood flows through vessels and the
cross-sectional area of the vessels?
✓ ~~~The higher the cross sectional area the slower the blood flows, like in capillaries.
Which blood vessel is made of only one tissue layer, the tunica interna?
✓ ~~~capillaries
Which of the following can result if renin is released by the kidneys?
✓ ~~~All of the above resulting in a raise in blood pressure
Which of the following is a true statement concerning the impact of alcohol on the
body?
✓ ~~~Alcohol inhibits ADH release causing vasodilation resulting in a flushed appearance
Which of the following factors would not increase resistance?
✓ ~~~An increase in the diameter of the blood vessel.
Which of the following hormones is produced by the heart and causes blood
pressure to decline?
✓ ~~~atrial natriuretic peptide
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