Human Body Systems

Which organ is primarily responsible for pumping blood throughout the human body?

• Lungs

• Heart

• Liver

• Kidney

What is the main function of the respiratory system?

• To digest food

• To circulate blood

• To exchange gases

• To produce hormones

Which body system is responsible for breaking down food into nutrients?

• Nervous system

• Digestive system

• Muscular system

• Skeletal system

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What is the basic unit of the nervous system?

• Neuron

• Alveolus

• Capillary

• Platelet

Which of the following best describes the function of red blood cells?

• Fight infections

• Carry oxygen

• Produce hormones

• Break down food

A student is running a race. Which two body systems are working together to supply her muscles with oxygen?

• Digestive and skeletal

• Respiratory and circulatory

• Nervous and digestive

• Muscular and excretory

If a person has a broken femur, which body system is directly affected?

• Muscular system

• Skeletal system

• Nervous system

• Endocrine system

Why does your heart rate increase when you exercise?

• To help you digest food faster

• To deliver more oxygen to your muscles

• To remove waste from your skin

• To slow down your breathing

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A person eats a meal high in carbohydrates. Describe how the digestive and circulatory systems work together to provide energy to the body’s cells.

• The digestive system breaks down carbohydrates into glucose, which is then absorbed into the blood by the circulatory system and delivered to cells for energy.

• The circulatory system breaks down carbohydrates, and the digestive system delivers glucose to the cells.

• The digestive system absorbs glucose directly into the muscles, bypassing the circulatory system.

• The circulatory system stores carbohydrates until the body needs energy.

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A student notices that when she touches a hot stove, she quickly pulls her hand away. Explain how the nervous and muscular systems interact in this situation.

• The muscular system senses the heat and moves the hand, while the nervous system repairs the skin.

• The nervous system detects the heat and sends a signal to the muscles, causing them to contract and move the hand away.

• The nervous system cools the hand, and the muscular system relaxes.

• The muscular system sends a signal to the brain to move the hand.