Understand the science behind daily life through questions covering health, energy, environment, inventions and natural phenomena.
Questions are tracked as practiced when you open Show Answer & Explanation. Tracking stays only in this browser tab and no subject-test result is saved.
Which tiny blood vessels allow the exchange of oxygen nutrients and waste between blood and body tissues?
Which blood vessels carry deoxygenated blood back to the heart from body tissues?
Which blood vessels carry oxygenated blood away from the heart to the rest of the body?
Which structure in the heart prevents the backward flow of blood between chambers?
Which muscle separates the chest cavity from the abdominal cavity and assists in breathing?
Which flap of tissue prevents food from entering the trachea during swallowing?
Which structure in the throat is commonly known as the voice box and is responsible for sound production?
Which structure connects the throat to the lungs and branches into smaller airways within the chest?
Which part of the human respiratory system is primarily responsible for warming and filtering incoming air?
Which organ in the human body acts as a reservoir for blood and helps filter out old or damaged red blood cells?
Which organ produces insulin to regulate blood sugar levels in the body?
Which organ stores bile produced by the liver until it is needed for digestion?
Which organ produces bile that aids in the digestion of fats?
Which acid in the stomach helps in the digestion of food and kills harmful bacteria?
Which stomach enzyme is primarily responsible for breaking down proteins into smaller peptides?
Which enzyme present in saliva begins the digestion of starch in the mouth?
Which gland produces saliva to aid in the initial digestion of food in the mouth?
Which type of teeth are primarily used for grinding and chewing food at the back of the mouth?
Which type of teeth are primarily used for tearing food in humans?
Which tube connects the middle ear to the throat helping equalize air pressure?