It’s B! When it comes too stuff like that people that are professionals need to know to get you to safety! That’s why it’s B.
Answer: Possibly, a pulmonary exercise stress test.
Explanation:
The 650 skeletal muscles in the human body contract when they receive signals from motor neurons, which are triggered from a part of the cell called the sarcoplasmic reticulum. Motor neurons tell your muscles to contract and the better you become at having those signals tell your muscles to contract, the stronger you can get.
