When elephants get hot, they flap their ears. This works nicely as a mechanism for heat loss because
a. the large surface to volume ratio of the ear favors loss of heat to the environment.
b. the flapping favors heat loss by conduction.
c. the flapping favors heat loss by convection.
d. the flapping favors heat loss by evaporation.
e. all of these.
E
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Apocrine sweat glands are most abundant on or in the
A. palms of the hands. B. forehead. C. neck. D. axilla.
Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber
A) lengthens. B) shortens. C) strengthens. D) weakens. E) pulls from the middle.
An Olympic sprinter readies for a race. After the sound of the starting gun, he propels himself forward from the starting block and immediately grimaces in pain, grabbing for the back of his thigh
Within 48 hours he begins noticing extensive bruising on the back of his thigh extending into the back of the knee. He now has difficulty rising from a seated position and flexing his knee. Bending at the waist generates more pain. Which muscle is likely injured? A) Iliopsoas B) Biceps femoris C) Popliteus D) Gluteus maximus E) Gastrocnemius
In human skeletal muscle, force generation capability is highest in which of the following conditions?
A. muscle is at resting length B. muscle is slightly shortened C. muscle is slightly lengthened D. muscle length is irrelevant to force production