(Solved) PhysioEx 9.0 Exercise 5 Activity 1

Sky

wrote...

Go to Answer

12 years ago

Part A:
How does the body decrease the blood vessel radius?

A.   Vasoconstriction
B.   Vasodilation
C.   Cardiac Muscle Contraction
D.   Valve Closure

Part B:
When the radius of the flow tube is decreased, the _______.

A.   Pressure Gradient Decreases
B.   Fluid Flow Rate Decreases
C.   Fluid Flow Rate And The Pressure Gradient Decrease
D.   Friction Decreases
E.   Fluid Flow Rate Increases

Part C:
During exercise, we might expect blood vessels in the skeletal muscle to be somewhat _______________ and the blood vessels in the digestive organs to be somewhat ____________.

A.   Constricted, Constricted
B.   Constricted, Dilated
C.   Dilated, Constricted
D.   Dilated, Dilated

Part D:
Laminar flow of the blood is achieved through _______.

A.   Smooth Muscle Contraction
B.   Vasoconstriction
C.   Vasoconstriction And Smooth Muscle Contraction
D.   Vasodilation

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Replies

robertling

wrote...

Valued Member

12 years ago

1. The radius and blood flow are directly proportional to each other. As the vessel radius increases, the blood flow also increases.

2. Depending upon the local needs of nutrients and oxygen by the tissues, blood vessels will increase or decrease their radii by altering the amount of contraction of the smooth muscle in the tunica media. The alteration of vessel diameter is controlled by the autonomic nervous system.

3. The plot is not linear it is curved because blood flow varies directly in an exponential fashion to the radius.

4. Slower blood flow allows for more time for nutrient and gas exchange to occur between the blood and the
surrounding cells.

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Sky Author

wrote...

12 years ago

3 Votes

bio_man, gatorfan0192, gatorman1

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PhysioEx 9.0 Exercise 5 Activity 1

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