Problem: What are enzymes? What is anabolism? What are essential organic molecules that humans cannot synthesize? What are negatively charged particles? What is matter? How many cells is the human body comprised of? What is the "powerhouse" of the cell? What is diffusion? What is the function of the Golgi apparatus? What is the function of connective tissue? What is the purpose of serous fluid? What is collagen? Which type of cartilage is found on the ends of bones? What is the largest organ in the body? What purpose does keratin serve? How many hours does it take for a decubitus ulcer to appear? What is cyanosis? Which glands produce sweat? Which type of healing results in no visible scar? What is the central nervous system comprised of? What is the peripheral nervous system comprised of? How many pairs of spinal nerves are there? How many pairs of cranial nerves are there? What is the function of the corpus callosum? I would seriously look this study guide over.