What is the main function of the respiratory system?, To take in oxygen and remove carbon dioxide., Which organ is responsible for filtering blood in the urinary system?, The kidneys., What is the function of the circulatory system?, To transport blood, oxygen, and nutrients around the body., What are the main organs of the reproductive system?, Ovaries and testes., Which body system protects internal organs and regulates body temperature?, The integumentary system (skin)., What is the main function of the digestive system?, To break down food and absorb nutrients., Which system controls hormones in the body?, The endocrine system., What is the main function of the skeletal system?, To support the body and protect organs., Which system helps the body move?, The muscular system., What is the main organ of the nervous system?, The brain., What is the function of the lymphatic (immune) system?, To defend the body against diseases and infections., How do the lungs help in respiration?, They exchange oxygen and carbon dioxide., What is the main waste product removed by the kidneys?, Urea., What carries oxygen in the blood?, Red blood cells., Which organ produces eggs in females?, The ovaries., Which organ protects the body from harmful UV rays?, The skin., Where does most digestion and nutrient absorption occur?, In the small intestine., Which gland controls metabolism?, The thyroid gland., What gives the body its shape and support?, The skeleton., Which type of muscle works automatically in your body?, Involuntary (smooth or cardiac) muscles., What connects the brain to the rest of the body?, The spinal cord., What does the immune system produce to fight germs?, Antibodies., What gas do we breathe out?, Carbon dioxide., How do kidneys maintain balance in the body?, They remove waste and balance water and salt., What part of the circulatory system pumps blood?, The heart., What is fertilization in the reproductive system?, When sperm and egg join., What helps the skin heal after injury?, New skin cells grow to close the wound., What helps break down food in the stomach?, Stomach acid and enzymes break down food., Which gland releases insulin?, The pancreas., What connects bones together?, Ligaments., Which muscle helps you breathe?, The diaphragm., What is the largest organ of the body?, The skin., What carries messages between the brain and body?, Nerves., What organ stores white blood cells in the immune system?, The spleen., Which system provides oxygen to cells?, The respiratory system., What happens when you hold your breath too long?, Carbon dioxide builds up and you feel dizzy., What happens if kidneys stop working properly?, Waste builds up, and dialysis may be needed., What blood vessels carry blood away from the heart?, Arteries., What is the male reproductive cell called?, Sperm., How does sweating help your body?, It cools your body down., What are the tiny hair-like structures in the lungs called?, Cilia., What organ stores urine before excretion?, The bladder., What is the function of red blood cells?, Carry oxygen around the body., What is the function of the uterus?, To hold and nourish a developing baby., How does the skin help control body temperature?, By sweating and controlling blood flow., What happens to food in the small intestine?, Nutrients are absorbed into the blood., What gland is called the “master gland”?, The pituitary gland., What is bone marrow responsible for?, Making blood cells., Which system helps maintain posture?, The muscular system., How does the immune system remember past infections?, It creates memory cells to fight the same infection again..

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