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adrenal amino acids amount animals aorta arises artery atom becomes blood pressure blood vessels body bone brain branches called canal capillary carbohydrates carbon carotid cartilage cause cavity centrioles chemical chromosomes coenzyme color cone cells connective tissue contains contraction corpus luteum cortex cranial cytoplasm digestive dorsal duct ectoderm electrons embryo energy enter enzyme epithelium excreted female fetus Figure fluid function ganglion glands glucose heart hormone hydrogen intestine ions kidneys layer lens liver lobe located lungs lymph lymphatic male medulla membrane metabolism molecule motor mucous muscle muscular nerve fibers nerve impulse neurons normal nucleus organ ovum oxygen pancreas parasympathetic passes pigment plasma portion posterior pressoreceptors produced proteins pyruvic acid receptors red cells respiratory retina secretion sensory skin sodium spinal cord stimulated stomach structure substances sugar surface sympathetic tendon thoracic tion tract tube tubules urine uterus veins ventricle vertebrae vitamin wall