Marinades don't penetrate nor do acids tenderize,except for making the outer mushy. Papain, if not time controlled, will turn the meat to mush also. Sorry to be the bearer of bad news but at least you have something that will tenderize. Nothing is going to make tri tip melt literally like butter.
The diaphragm is the major muscle responsible for breathing. It is a thin, dome-shaped muscle that separates the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts, so that it's centre moves caudally (downward) and its edges move rostrally (upward).
When one takes a deep breath, accessory muscles of respiration are brought into action (Scalene, sternomastoid and trapezium). Scalene is the first muscle to start contracting and gradually other two muscles are brought into action. When these muscles contract for tidal breathing-it is abnormal.hen one takes a deep breath, accessory muscles of respiration are brought into action (Scalene, sternomastoid and trapezium). Scalene is the first muscle to start contracting and gradually other two muscles are brought into action. When these muscles contract for tidal breathing-it is abnormal.