Explain structure of the muscle with the help of a diagram.
There are about 600 voluntary muscles in the body. Each muscle is made up of thousands of long and narrow muscle cells called muscle fibers. These muscle fibers are arranged in bundles and enclosed within a tough layer of connective tissue called epimysium (sarcolemma). Every muscle fiber is made up of very large number of microscopic threads called myofibril. Myofibril consists of protein molecules called actin and myosin.
Where are hinge joints found in human body?
Explain external and internal respiration.
Define the phenomenon of second wind. What are its causes and symptoms?
What are the functions of respiratory system?
