BIOL 251 W6-Exam 2 Questions and Answers Latest Updated 2026/2027 (Graded A+)- American Public University

BIOL 251 W6-Exam 2 Questions and Answers Latest Updated
2026/2027 (Graded A+)- American Public University

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Released: Jan 21, 2026 12:55 AM
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Question 1 points

The exchange of substances between the blood vessels and the surrounding tissues can only happen in the
.

Venules

Arteries

Veins

Arterioles

Capillaries


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Question 2 points

Which tunic of an artery is responsible for maintaining blood pressure?

Tunic intima

Tunica media

Tunica externa

Tunica interna

None of the above.


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Question 3 points

The following is a list of vessels. Place them in the order that blood would go through entering the systemic
circulation. 1. Left ventricle 2. Aorta 3. Vena cavae 4. Pulmonary trunk 5. Pulmonary veins 6. Right atrium 7. Right
ventricle 8. Left atrium

, 6, 7, 3, 5, 2, 1, 4, 8

3, 6, 7, 4, 5, 8, 1, 2
1, 7, 3, 8, 5, 6, 2, 4

8,1,3, 6, 7, 5, 2, 4,
3, 5, 8, 4, 1, 2, 7, 6


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Question 4 points

Capillaries that are lined with phagocytes are called .

Sinusoid capillaries

Arterioles
Venules
Fenestrated capillaries
Continuous capillaries


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Question 5 points

The amount of blood pumped by either ventricle in one minute is called.

Starling output



Stroke volume
Systolic volume
End systolic volume


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Question 6 points

is a condition where the heart is beating over 100 beats per minute.