Answer:
Rigor Mortis
Explanation:
After death (the third stage) Rigor Mortis occurs which is the stiffening of the muscles. It is caused by the chemical changes in the muscles after death.
Mitochondria contains special enzymes that muscle cells need to utilize oxygen.
Answer:
Target heart rate is generally expressed as a percentage (usually between 50 percent and 85 percent) of your maximum safe heart rate. The maximum rate is based on your age, as subtracted from 220. So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.
Explanation:
