Herbed Wellness, a manufacturer of herbal products, wants its new headache remedy to be as effective as possible while using only natural ingredients. A controlled study has found that 58 percent of headache sufferers obtain complete headache relief from a dose of caffeine equivalent to that typically found in a cup of coffee. Therefore, even though the vast majority of its customers are health-conscious avoiders of coffee, Herbed Wellness should add caffeine to its new herbal headache treatment; doing so will prove both efficacious and cost-effective. The answer to which of the following questions would be most useful in evaluating the claim that caffeine will be efficacious in relieving headaches among Herbed Wellness customers?
A. Is the headache relief provided by caffeine as long-lasting as that provided by over-the-counter drugs such as aspirin?
B. What percentage of the study participants were regular coffee drinkers who suffer from caffeine-withdrawal headaches?
C. Is caffeine less expensive per dose than the individual herbs used in the headache formulation?
D. Does synthetic caffeine qualify as a natural substance?
E. What percentage of Herbed Wellness customers will shun the new headache remedy if it contains caffeine?

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/