This question depends on the person. Usually by around 200 to 210, your heart begins to go into an abnormal rhythm or disrythmia, called VT or PVT. The respectively, stand for Ventricular Tachycardia and Pulseless Ventricular Tachycardia (PVT is the more dangerous variety). At around this stage a patient runs the risk of cardiac arrest, which is dangerous because while the heart continues to beat, the contractions are so fast, blood isn't being let into the chambers of the heart. Without blood actually being pumped, the person is unable to perfuse, and goes into shock, seizure, coma, and then death.
They can be legitimate or excuses. If a person genuinely can’t bench 50 pounds because they’re not strong enough to lift the bar that’s barrier but if someone can do something such as run on the treadmill for 5 minutes but just don’t want to that’s an excuse.
I’m not really sure but I think it’s vitamins
It is fibers. The bundles of fibers are surrounded by a tissue inside the cell.
Hope I helped
Early civilizations used plants as medicine.