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Which organ is the main part of the respiratory system?
Lungs
What muscle helps the lungs in breathing?
Diaphragm
What do we inhale during breathing?
Oxygen
Which blood vessels carry blood away from the heart?
Arteries
Which blood vessels carry blood back to the heart?
Veins
What organ pumps blood throughout the body?
Heart
What carries oxygen in the blood?
Red blood cells
During puberty, boys often experience:
Voice deepening
During puberty, girls usually begin to experience:
Menstruation
Which organ produces sperm cells?
Testes
Which organ produces egg cells?
Ovary
Which part of the male reproductive system carries sperm out of the body?
Urethra
Where does the fertilized egg develop in the mother’s body?
Uterus
Which of the following is a sign of puberty in both boys and girls?
Growth spurt
The tiny air sacs in the lungs where gas exchange happens.
Alveoli
The organ that controls the pumping of blood.
Heart
