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structures and functions of
the composite reference individual
42 other sections not shown
absorption acid activity amino-acids animals anoxia arterial associated barrier area behaviour bio-economic blood pressure bloodstream bone brain calcium called capillaries carbohydrate carbon dioxide cause cell organizations central control central nervous system centre cerebral cortex changes Chapter chemical circulation components cortex diet endocrine energy environment enzymes excretion fibres glands glucose glycogen groups haemoglobin heart hormones human impulses increased infection interchange intestine kidneys layer liver living body living cells living individual lungs machine maintained material mechanisms medulla metabolism microscope molecules mucous membrane nerve cells nervous system neurons normal nucleus nutrients ovum oxygen particular pass performance physical physico-chemical physiological pituitary plasma proteins protoplasm quantity reactions receptor reflex region relationships removed requirements respiratory secretion skeletal muscles skin smooth muscle somatic spinal cord structures and functions substances sugar supply surface surroundings take place temperature tract vascular vessels Vitamin