All of the following are true about cardiac muscles, EXCEPT:: (A) Abundant mitochondria are present., (B) Has high content of myoglobin, (C) 10% energy is provided by anerobic metabolism, (D) None of the above
Answer is C. Mammalian heas have an abundant blood supply, numerous mitochondria, and a high content of myoglobin, a muscle pigment that can function as an O2 storage mechanism. Normally, less than 1% of the total energy liberated is provided by anaerobic metabolism. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 5.