The cardiovascular system's primary function during exercise is to deliver oxygen and nutrients to working muscles and tissues and to remove carbon dioxide and other waste products.
Type I muscle fibers, or slow-twitch fibers,
are more resistant to fatigue and are used primarily during endurance activities due to their high aerobic capacity.
ATP is the primary energy carrier in cells, and it provides the energy needed for muscle contractions.
Regular aerobic exercise primarily improves cardiovascular endurance,
which is the ability of the heart, lungs, and blood vessels to deliver oxygen to working muscles during prolonged physical activity.
An eccentric contraction occurs when the muscle lengthens while still generating force, often seen during the lowering phase of a lift.
Glucagon is responsible for raising blood glucose levels by promoting the release of glucose from the liver, especially important during exercise when energy demands increase.
VO2 max is the maximum rate at which oxygen can be taken up and utilized by the body during intense exercise, serving as a key indicator of aerobic fitness.
