Many reasons:
Putting too much exertions on weak muscles
working out or lifting wrong
heavier: therefore more strain on muscles
Skeletal Muscles
Skeletal muscles can be consciously controlled during exercise, whereas cardiac and smooth muscles cannot be consciously controlled.
Skeletal muscles generate heat during physical activity through a process called muscle contraction. When muscles contract, they use energy from ATP molecules, which produces heat as a byproduct. This heat helps to maintain the body's temperature during exercise.
The diaphragm and intercostals for breathing
skeletal muscle
During contraction the two articulating bones move equally
the brain has 2 powerful systems work together to paralyze skeletal muscles during rapid eye movement sleep according to reaserch scientist may have better understanding
Though the skeletal does come under pressure during exercise, the movements are beneficial for strengthening the muscles and bones. Exercise also enhances flexibility.
The contractile units of skeletal muscles are called sarcomeres. Sarcomeres consist of actin and myosin filaments that slide past each other during muscle contraction, causing the muscle to shorten and generate force.
Once you start to exercise, your body has to make sure that the muscles that are now working much harder receive the oxygen and fuel they need to keep contracting. The various body systems must begin to work faster and harder to meet this extra demand. The muscles start to work harder, requiring more oxygen and producing more carbon dioxide, which needs to be removed
Skeletal. Definitely. Skeletal Muscle moves bone whereas smooth muscle is found in organs and other parts of the body (stomach, veins, arteries, etc.)
The cardiovascular system provides oxygen and nutrients to the skeletal muscles during physical activity, which helps the muscles function optimally. Additionally, the cardiovascular system helps remove waste products such as lactic acid produced by the muscles during exercise. Improved cardiovascular fitness can enhance the endurance and overall performance of the skeletal muscles.