They can live for as long as five years. The young are born hairless and helpless, and their eyes do not open until about 18 days after birth. They typically become sexually mature after the end of their first hibernation.hey can live for as long as five years. The young are born hairless and helpless, and their eyes do not open until about 18 days after birth. They typically become sexually mature after the end of their first hibernation.
A muscle knot is the lay term for what are also known as trigger points, sometimes abbreviated as TrP. These are sensitive points all over your body, but mostly on the back and neck that are particularly sensitive to irritation.
What Causes Muscle Knots In Your Upper Back. A âknotâ is a contraction (shortening) or spasm in a muscle. It is a place where a muscle has become âtightâ for one reason or another. Overwork is the most common cause. That doesnât mean that YOU are working too muchâit means that some of your muscles are.