Find the attachment of the tendon of the biceps
muscle to the radius and measure its distance to the center of the elbow
joint. From these distances calculate the force with which the biceps
contracts in order to support a weight of ten pounds on the palm of the
hand.
13. How does exercise benefit the health? How does a short walk "clear the
brain" and enable one to study to better advantage?
14. When exercisers taken for its effects upon the health, what conditions
should be observed?
PRACTICAL WORK
The reddish muscle found in a piece of beef is a good example of striated
muscle. The clear ring surrounding the intestine of a cat (shown by cross
section) and the outer portion of the preparation from the cow's stomach,
sold at the butcher shop under the name of _tripe_, are good examples of
non-striated muscular tissue. The heart of any animal, of course, shows
the heart muscle.
*To show the Structure of Striated Muscle.*--Boil a tough piece of beef, as
a cut from the neck, until the connective tissue has thoroughly softened.
Then with some pointed instrument, separate the main piece into its fiber
bundles and these in turn into their smallest divisions. The smallest
divisions obtainable are the muscle cells or fibers.
Pages:
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353