Why Is Heat Shown Flowing from the Worker in the Illustration

question 63

Multiple Choice

Why is heat shown flowing from the worker in the illustration below?

• A)The worker was exposed to the sun while working outside and simply got hot.
• B)The conversion of metabolic energy into muscle contraction is not 100 percent efficient and some of the energy is lost as heat.
• C)Using a hammer, paintbrush, or any other tool generates friction and heat in the arm that must be lost to maintain homeostasis.
• D)Energy and matter are equivalent; the conversion of the worker's body mass to kinetic energy requires a reduction of body mass and is indicated by the outflow arrows.