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Which organ is responsible for producing red blood cells in adults?
A. Liver
B. Spleen
C. Kidneys
✔✔ D. Bone marrow
What is the primary function of the mitochondria?
A. Store energy
B. Break down waste
✔✔ C. Produce ATP (energy)
D. Synthesize proteins
Which part of the eye controls the amount of light entering?
A. Retina
✔✔ B. Iris
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,C. Cornea
D. Optic nerve
Why do arteries have thick, muscular walls?
A. To slow down blood flow
✔✔ B. To withstand high blood pressure
C. To store oxygen
D. To absorb nutrients
Which type of muscle is found in the walls of internal organs?
✔✔ A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Voluntary muscle
What is the primary function of white blood cells?
✔✔ A. Fight infections
B. Transport oxygen
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,C. Clot blood
D. Absorb nutrients
Which organ stores bile produced by the liver?
✔✔ C. Gallbladder
A. Pancreas
B. Small intestine
D. Stomach
What is the function of the trachea?
✔✔ B. Carry air to and from the lungs
A. Pump blood to the lungs
C. Produce digestive enzymes
D. Exchange gases in the bloodstream
Which hormone controls water balance in the body?
A. Insulin
B. Estrogen
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, ✔✔ C. Antidiuretic hormone (ADH)
D. Adrenaline
Why do veins have valves?
✔✔ D. To prevent backflow of blood
A. To increase blood pressure
B. To transport oxygen
C. To store nutrients
What is the function of the diaphragm?
✔✔ A. Assist in breathing by contracting and relaxing
B. Pump blood through the lungs
C. Protect the heart
D. Absorb oxygen from the bloodstream
Which part of the digestive system is responsible for most nutrient absorption?
✔✔ B. Small intestine
A. Large intestine
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