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homeostasis biology proteins chemicals excretion digestion digestive system excretory organs defence system lymph nodes lymphatic system capillary bed blood circulatory system veins arteries lymphatics immunological lymph lacteals temperature control homeothermos skin layers melanin dermis carbohydrates lipids components cells denaturation enzymes lock&key synthesis dna rna psychology of eating diet nutritional requierements menstrual cycle reproductive organs pregnancy breast feeding mating fertilization heart circulatory system pressure earth first cells theories respiratory surfaces breathing gaseous exchange air respiratory mechanics respiratory system toxic waste products exercise breathing centre lung volumes smoking food metabolism alimentary canal glands peristalsis digestive enzymes absorption assimilation egestion hypodermis epidermis line of defense keratin ultrafiltration kidneys urine reabsorption medulla adh nephron dialysis urea cortex glomerulus osmoregulation excretory system multiple intelligence learning styles education science life