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Which Are the Most Stubbora Musclea? The raus-

cles uf the forearm and the cali

What Are the Most Powerful Muscles? The latis-

siinus dorsi muscles, the ercctor spmae and the quad-riceps femoris.

What Makes the Calf Muscles Hard to Develop?

The fact that the muscular fibres of the calf are morę dense in structure than the rest. Front constaut usc vigorous action is easily .ibsoibed, which makes it morę difficult for exerci?c to gain respouse. Also the ioot as a fulerum is not uscd sufficicntly to cxcrt fuli coutractiou of lite gastrucncnmis, the major part bcing absorbed within the hinge oi the ankle which causes the c-ffort to remain mostly m the Achilles tendon.

What Makes the Forearm Muscles Hard to Develop? Thcrc arc uumerous muscles in the forearm and ordi-nary usc does not give Lhem much cxercise. These muscles are the very opposite to the biceps and other muscles itiasmuch that they lack the flcshy bclly to any noticcable degree, being conlrollcd by ligaments ot extreme length. Consequently it takes a great dcal oi effort to bring ahout any noticeable size.

Which Are Out Voluntary and Involuntary Muscles? The muscles of the body are ybluntarily subjected to and guidcd l.y the will. The invo1untary muscles are ottr muscular urgans which work automatically free of the will.

What Is the Inlerpretation of the Sacrospinalis?

“The sacred part of the spinc," because in this area are contained tbe organs of procrcatioit.

In What Ordor Are the Muscles of the Spine? Fottr. 1. Ycrtcbro-scapular (spinc and shouldcr blade) and vcrtebro-huracral (spinc and upper arm). 2. Vcrtc-bro-costal (spine and chest). i. Vertebro-cranial (spine and bead). 4. Yertebral (spinc only).

How Do Muscles Exert Their Power? By'entircly shortening their length.

What M.akes the Muscles Contract and Relax?

When muscles exert their power the flcshy belly swclls as the muscle shortens, the puli is continued by the ligaments of the mnselc which draws upon its seat of inscr-tion, generałl> the bonę, until the arm or knec is bent: when the movement is cofnplćtcd the muscular belly ccases to contract, which becomcs then a conditioti of relaxation. Then atiothcr muscle, cir group opposc the muscle ot rclaxation and straightens the leg, arm er body. When the arm hangs still by the side both oppos-ing groups of muscles are cqual in rclaxation, until further direeled by the ttiiud

What Is Muscie StiuctUre? Muscles arc composed of millions of Httle twisted fibrc-s uf varicd length? that lic side by side likc the fibres of a ropę. They arc cncascd in a flcshy belly and ta per uff into mcmbraueous lissuc that ends in a tendon or ligament which attaches iisclf to thę bor.e, or fascin as is the case with the abdominal muscles.

Have the Muscle Fibres Got a-Brain? In the center uf each fibrę is a celi. or brain. which dirccts its littic will acording to the resislance requircd. Each celi ^:,,ts a blnod particie ubieli nóurishes the brain and the muscle fibrę. Throughout the muscle tisstie the ner-"us system spreads its branches supplying the power

thosc motive factors

Why Do the Muscles Tire" When the muscles aro relased the nerce waves help the blood to filter through the tissues to nourish and clcanse. some of the hlOod is retained hy the blood particie to tlić fibrę celi