Each skeletal muscle is a discrete organ made up of hundreds or thousands of muscle fibers. although muscle fibers predominate, substantial amounts of connective tissue, blood vessels, and nerve fibers are also present. what happens during muscle contraction?

What is the number of phosphates in an atp molecule

What is the difference between an igneous, sedimentary and metamorphic rock

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.