Third Exam
BISC 307L  General Physiology
April 4, 2005
1.
Answer all of the 13 questions.
READ EACH CAREFULLY!
2.
Note that questions have different point values.
In all, 70 points are possible.
3.
You have 50 minutes for this exam, about 7 minutes for a 10point question.
4.
Write your answer within the box or blank given for each question.
Material
written outside these spaces will not be graded.
5.
Abbreviations used in lecture are acceptable.
6.
Calculators are NOT allowed.
7.
Show your work in solving quantitative problems.
Partial credit will be given
for correct procedure, even if answer is incorrect.
8.
Make you answers as brief as possible. Points will be subtracted for irrelevant
material.
WRITE YOUR NAME ON EACH PAGE
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1.
(6 points) A blood vessel runs from A to B.
At B it splits into two smaller vessels, which
rejoin at C.
The resistance of the vessel from A to B is 5
Ω
, while the resistances of the two
smaller vessels are 15
Ω
and 30
Ω
.
The blood pressure at A is 90 mmHg and that at C is
75 mmHg.
A. What is the blood flow through the 5
Ω
vessel?
B.
What is the blood pressure at B?
C.
What is the blood flow through the 30
Ω
vessel?
1/R = 1/(15
Ω
) + 1/(30
Ω
); so R = 10
Ω
A. Q = (15 mmHg)/(15
Ω
) =
1 liter/min
B. P
B
= 90 mmHg – (1 l/min)x(5
Ω
) =
85 mmHg
C. Q = (10 mmHg)/(30
Ω
) =
1/3 liter/min
2.
(4 points) Blood vessel 1 has twice the diameter of vessel 2.
Both vessels have the same
length and drop of pressure from one end to the other.
A.
How does the blood flow through vessel 1 (Q
1
) compare to that through vessel 2 (Q
2
)?
B.
How does the average velocity of the blood in vessel 1 (V
1
) compare to that in vessel 2 (V
2
)?
R = k r
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 Spring '08
 Herrera
 Physiology, heart rate, total peripheral resistance

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