When we are cold, or the external temperature is low, most venous blood returning from the distal part of the arm travels in the
deep veins where it picks up heat (by countercurrent exchange) from the nearby brachial artery en route. However, when we are hot, and especially during exercise, venous return from the distal arm travels in the superficial veins and those veins tend to bulge superficially in a person who is working out. Explain why venous return takes a different route in the second situation.
1. muscle<span> whose action is normally </span>controlled<span> by an individual's will; mainly skeletal</span>muscle, composed of parallel bundles of striated, multinucleate fibers. Origin ofvoluntary muscle<span> Expand. hope this helps :D</span>
