-salivary amylase
-pepsinogen
-pancreatic amylases
-nucleases
-lipases
-medulla
-artery
-vein
-capillary
-hemoglobin
-oxyhemoglobin
-carbonic acid-bicarbonate ion system
-pathway of blood
-hormones
-pheromones
-anterior pituitary
-posterior pituitary
-thyroid
-parathyroid
-adrenal cortex
-adrenal medulla
-pancreas
-thymus
-pineal in brain
-ovaries
-testes
-steroid hormones
-polypeptide hormones
-feedback mechanism (positive/negative)
-Central nervous system
-Peripheral nervous system
-neuron
-dendrites
-axons
-reflex arc
-sensory neuron
-interneuron
-motor neuron
-repolarization
-synapse
-refractory period
-neurotransmitter
-cones
-cornea
-humor
-iris
-lens
-pupil
-retina
-rods
-auditory canal
-cochlea
-ear bones
-eustachian tube
-oval window
-semicircular canals
-tympanum
-kidney
-renal artery
-antidiuretic hormone
-collecting tube
-nephron
-smooth muscles
-skeletal muscles
-cardiac muscle
-sliding filament theory
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