Physical training makes the body stronger and faster, beginning with the cells. [Cells, atoms, and molecules are described.] The three main types of cells are smooth muscle, cardiac muscle, and skeletal muscle cells. Training makes the muscle cells stronger, bigger, and able to make the body move more quickly, while helping the heart cells become better at pumping blood to the muscles. It also helps lung cells get better at brining in the oxygen needed to convert food into molecules that make your muscles move. Food is fuel for the cells, with carbohydrates being converted to molecules that help your muscles, lungs, and heart move, breathe, and beat for the race. Eating proteins helps repair tired muscles, making muscles stronger.
Frequent practice helps cells learn what to do and makes them work together more smoothly. A trained body has an advantage because its cells help it move faster and recover more quickly. To win a race, care for your cells by eating well, drinking water, getting enough sleep, and training a little each day.
24 pages with colorful photographs and illustrations. Reading Level 1-3, Interest Level 2-5. Includes a pronunciation guide for scientific terms.
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