Easy Level
- What is the largest organ in the human body?
- How many bones are in the adult human body?
- Which organ pumps blood throughout the body?
- What is the body's main energy source?
- Which bone protects the brain?
- What are the smallest blood vessels called?
- Which organ produces insulin?
- What is the strongest muscle in the human body by weight?
- Which system includes the lungs?
- What is the colored part of the eye called?
- How many chambers does the human heart have?
- Which organ filters blood and produces urine?
- What is the scientific name for the voice box?
- Which blood cells fight infection?
- What is the name of the bone in the thigh?
Medium Level
- What is the longest nerve in the human body?
- Which gland is known as the 'master gland'?
- What is the name of the flap that prevents food from entering the windpipe?
- Which part of the brain controls balance and coordination?
- How many pairs of ribs does a typical human have?
- What is the name of the fluid that lubricates joints?
- Which organ produces bile?
- What is the smallest bone in the human body?
- Which part of the eye detects light and color?
- What is the name of the muscle that separates the chest from the abdomen?
- Which blood type is the universal donor?
- What is the name of the tubes that connect the kidneys to the bladder?
- Which part of the neuron receives signals?
- What is the name of the pigment that gives skin its color?
- Which organ stores bile?
- What is the name of the membrane surrounding the heart?
- Which part of the digestive system absorbs most nutrients?
- What is the name of the air sacs in the lungs?
- Which hormone regulates sleep cycles?
- What is the name of the bones that make up the spine?
Hard Level
- What is the name of the only artery that carries deoxygenated blood?
- Which cranial nerve controls eye movement?
- What is the name of the structure that connects the two hemispheres of the brain?
- Which cells produce myelin in the central nervous system?
- What is the name of the fluid that circulates in the brain and spinal cord?
- Which muscle is responsible for blinking?
- What is the name of the valve between the left atrium and left ventricle?
- Which part of the brain regulates body temperature?
- What is the name of the cells that form bone?
- Which layer of skin contains blood vessels and nerves?
- What is the name of the protein that allows muscles to contract?
- Which part of the nephron performs filtration in the kidney?
- What is the name of the space between neurons where signals are transmitted?
- Which hormone stimulates milk production in mammals?
- What is the name of the structure that connects a muscle to a bone?