The orbicularis oculi muscle will
A. purse the lips.
B. open the mouth.
C. raise the eyebrows.
D. open the eyes.
E. close the eyes.
Answer: E
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A 500N gymnast performing a giant swing with an angular velocity of 5 rad/sec, exerts 90 Nm of torque on the support bar. How much torque is exerted by the bar on the gymnast's hands?
A. 100 Nm B. 2500 Nm C. 590 Nm D. 90 Nm
Using the appropriate equations, predict the effects in each scenario.
A. Vessels X and Y have the same diameter. X is 5 cm long and Y is 10 cm long. Which has the faster velocity of flow for the same fluid? B. A blood vessel has a radius of 4 cm. Vasoconstriction reduces the radius to 1 cm. In order to maintain the same flow, by what factor must pressure increase? C. The blood vessel in B above dilates from 1 cm to 4 cm. Does the flow rate increase or decrease? D. A new subdivision is built between your house and the water storage tower. If the water company makes no adjustments, will the water pressure at your house change? If so, in which direction? Why?
The portion of the female reproductive tract in birds that directs the egg to the cloaca is the:
A) uterus B) urodeum C) vagina D) isthmus
Why is the contraction strength of smooth muscle relatively independent of its resting length?
A. It does not have intercalated discs. B. It is regulated by a length-tension relationship. C. It gets nearly all of its Ca2+ from the extracellular fluid. D. It does not have sarcomeres. E. It is involuntary muscle.