The sliding filament theory is the explanation for how muscles contract to produce force. As we have mentioned on previous pages, the actin and myosin filaments within the sarcomeres of muscle fibres bind to create cross-bridges and slide past one another, creating a contraction.
Experiencing less stress has to be the answer. Stress has to do with your emotions and practicing abstinence causes less stress. The female doesn't have to be scared because she might be pregnant, etc. Abstinence allows one to focus on goals etc. not on the goals of others.
Depends on how much weight, sit ups wont make you lose drastic weight, running is the only way to do that along with a healthy diet. As far as Sit-ups go i suppose about 300 a day would help cut weight fast. <span />
Blood location b it going into the heart and carries o2 with it from the lungs
