Body Systems Quiz: Circulatory, Respiratory, and Digestive Systems

What is the primary function of red blood cells in the circulatory system?

• Delivering oxygen to cells
• Producing blood plasma
• Repairing blood vessels
• Fighting infections

What is the main role of white blood cells in the body?

• Repairing tissue damage
• Fighting off foreign substances
• Carrying oxygen
• Transporting nutrients

How large is the human heart approximately?

• Size of a football
• Size of a tennis ball
• Size of a fist
• Size of a small apple

Where are most nutrients absorbed during digestion?

• Stomach
• Small intestine
• Esophagus
• Large intestine

What organ helps fill the lungs with air during breathing?

• Trachea
• Lungs
• Heart
• Diaphragm

What do platelets do in the circulatory system?

• Produce blood
• Fight infections
• Repair veins and arteries
• Carry oxygen

What happens to air when it first enters the nose?

• Goes directly to lungs
• Enters the stomach
• Gets filtered by hairs
• Bypasses the trachea

Where does digestion begin in the human body?

• Small intestine
• Esophagus
• Stomach
• Mouth

What substance helps soften food during the initial stages of digestion?

• Water
• Gastric juice
• Saliva
• Blood plasma

What organ releases juices to process fats and carbohydrates?

• Pancreas
• Stomach
• Kidneys
• Liver