BIO 169 Exam 1 Questions With Correct
Answers
Which of the following are important sources of resistance to blood flow? - answerAll of the
Above
A _________ allows an organ to recieve blood from more then one arterial source or drain blood
into more then one vein. - answervascular anastomoses
...
BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
BIO 169 Exam 1 Questions With Correct
Answers
Which of the following are important sources of resistance to blood flow? - answer✔✔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. - answer✔✔vascular anastomoses
Arteries can be best defined as - answer✔✔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. - answer✔✔blood viscosity
The systolic pressure - answer✔✔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 - answer✔✔undergo
vasoconstriction so less blood will reach those tissues.
Vasodilation - answer✔✔is an increase in the diameter of a blood vessel.
Which of the following is a correct statement concerning continuous capillaries? -
answer✔✔constitute the blood-brain barrier
What is the relationship between the velocity blood flows through vessels and the cross-sectional
area of the vessels? - answer✔✔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? - answer✔✔capillaries
Which of the following can result if renin is released by the kidneys? - answer✔✔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? -
answer✔✔Alcohol inhibits ADH release causing vasodilation resulting in a flushed appearance
, BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
Which of the following factors would not increase resistance? - answer✔✔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?
- answer✔✔atrial natriuretic peptide
Which of the following is a correct statement concerning blood flow to the capillaries? -
answer✔✔precapillary sphincters are composed of smooth muscle, relaxation of this sphincter
allows blood to enter the capillary bed
Which of the cardiovascular system's circuits has deoxygenated blood in its arteries? -
answer✔✔pulmonary circuit
Increased cardiac output will cause an _______________ in blood pressure. - answer✔✔Increase
Which of the following is responsible for moving blood in the veins? - answer✔✔all of the
above
Which of the following structures is responsible for changing the flow of blood through a
capillary bed based on the needs of the tissue? - answer✔✔precapillary sphincters
Which type of artery contains relatively more smooth muscle? - answer✔✔muscular
(distributing) arteries
Which type of artery would be found closest to the heart and have large lumens to reduce the
resistance encountered by blood leaving the heart? - answer✔✔Elastic (conducting) arteries
Which type of capillary would be found in the kidney where large amounts of filtration must
occur? - answer✔✔fenestrated capilaries
Which type of circulatory shock results from a large loss of blood? - answer✔✔hypovolemic
shock
Which type of vessel has the highest total cross sectional area? - answer✔✔Capillaries
_________ is a second messenger that activates ____________ to alter cell activity. -
answer✔✔cAMP, protein kinases
What is bound to G proteins in the inactive state? _______ In the active state? _________ -
answer✔✔GDP, GTP
Endocrine cells ___________ , where as ________ cells secrete chemicals that act locally
affecting cells other than those that secreted them. - answer✔✔release their produce into the
blood stream, paracrine
_________ acts via gene activation even though it is a(n) _____________ hormone. -
answer✔✔Thyroxine, amino acid based
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