Keeping Fit: Body Systems
"How many muscles do you have? What is a heart beat? How does sweat help your body? 'Do It Yourself' offers an exciting new approach to understanding and investigation. Each book helps you to conduct your own experiments and activities, and to learn more about the world around us."
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20 paces activity alveoli ball basketball Bend and stretch bicycle blood flows blood travels blood vessels bones bounce bronchiole called capillaries Carbohydrates carbon dioxide cartilage chemical or food chest circle contracts cool dehydration elastic fit and healthy food chemical food group Gentle hand heart and lungs heart pumps help your body hips Hold your breath hula hoop interval training jogging jump junk foods keep fit knee lactic acid ligaments look lower arm measure your pulse minutes move movement of blood muscles need any equipment nutrient oxygen and energy protective clothing Proteins pull pulse rate pumps blood red blood cells Repeat five resting rate right arm skeleton skin slowly bend soccer Steps to follow Taking drugs tape measure tennis thigh tiny tubes turn the rope type of food upper arm USA Gymnastics USA Swimming vitamin walk waste gas windpipe wrist