421Which organ is primarily responsible for pumping blood throughout the human body?
422How many lungs does a normal human body have?
423Which pair of organs forms the main site of gas exchange in the human respiratory system?
424Gas exchange between air and blood in the lungs primarily occurs within tiny sac-like structures called what?
425What is considered a normal resting breathing rate for a healthy adult, in breaths per minute?
426The diaphragm is a dome-shaped muscle that primarily assists the human body in performing what function?
427Bile, which helps digest fats, is produced by which organ and then stored in the gallbladder?
428Which digestive enzyme present in human saliva begins breaking down starch in the mouth?
429Most nutrient absorption from digested food primarily occurs in which part of the digestive tract?
430Absorption of water from digested material primarily occurs in which part of the digestive tract?
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