How does the heater organ of a swordfish produce heat?
A) The muscle contracts very rapidly, producing large quantities of heat.
B) The myosin binds very weakly to the actin, utilizing large amounts of ATP that ultimately produces heat, but no tension.
C) The sarcoplasmic reticulum releases and recovers large amounts of Ca2+, releasing heat as a by-product of these processes.
D) The muscle fibers are rapidly generated and degraded, which produces large quantities of heat as a by-product.
Answer: C
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