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Physiology Challenge

Across
Carries blood from the heart to the lungs
The lettered waves of an ECG
Right AV valve
Hormone initiated by the presence of chyme
Contracts and moves down during inhalation
Always carry blood away from the heart
Completes protein digestion
Down
The sound your heart makes
Aways carry blood toward the heart
Begins protein digestion in the stomach
Waste product of cells that must be exhaled
Location ofr gas exchange
Body's largest vessel
The central element in hemoglobin