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...The heart is a double pump visualizing heartbeat respiratory system overview of copyright mcgraw hill companies inc permission required for reproduction or display nasal cavity filters warms and moistens air pharynx passageway where pathway upper food cross glottis tract space between vocal chords opening to larynx voice box produces sound trachea windpipe passage bronchi bronchus lungs bronchioles lower alveoli lung contains sacs carries out gas exchange diaphragm skeletal muscle functions in ventilation muscular an example arrangement tendon origin biceps brachii contracted triceps relaxed humerus radius insertion ulna b endocrine glands hypothalamus releasing inhibiting hormones regulate anterior pituitary antidiuretic adh water reabsorption by kidneys oxytocin stimulates uterine contraction milk letdown gland posterior release produced parathyroids parathyroid hormone pth thyroid stimulating tsh raises blood calcium level adrenocorticotropic acth adrenal cortex gonadotropic fsh lh ...