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The Heart Beats
The Lungs Take in Supplies
4 other sections not shown
able air-sacs amoeba animal body auricle begin blood blood-stream blood-vessels bones brain breathe carbohydrates carbon dioxide carry CHAPTER chemical substances depends developed diaphragm diet digestive tract disease ductless glands eggs endocrine glands engine extent fluid food-stuffs function germs glands glomerulus goes haemoglobin happens heart hormone human body important inside joined joint juice kidney-cells kidneys large amount large number layer left ventricle liver living lungs machine male cells meat mechanism mixed motor-car muscle-fibres muscles nerve-cells normal nucleus number of different number of red ordinary organs oxygen pancreas pass petrol primitive produced properly protein protoplasm red cells reflex reproduction require salt scientists shape skin small intestine spinal cord stomach substance called sugar supply thyroid tissues tube usually valve vegetables vessels vitamin wall waste products weight white cells whole windpipe wonderful