Human Body Systems Quiz

What is the primary function of the circulatory system?

• To control body movements
• To transport oxygen, nutrients, and waste products
• To store energy in fat cells
• To produce hormones

Answer explanation

The circulatory system moves oxygen, nutrients, and waste products to and from cells in the body, maintaining vital functions.

Which of the following carries oxygen-rich blood away from the heart?

• Veins
• Arteries
• Capillaries
• Lymph nodes

Answer explanation

Arteries carry oxygen-rich blood from the heart to the organs and tissues of the body.

What part of the blood carries oxygen throughout the body?

• White blood cells
• Platelets
• Plasma
• Red blood cells

Answer explanation

Red blood cells contain hemoglobin, which binds to oxygen and delivers it throughout the body.

Which chamber of the heart pumps oxygenated blood to the body?

• Right atrium
• Left ventricle
• Right ventricle
• Left atrium

Answer explanation

The left ventricle pumps oxygenated blood from the heart to the entire body through the aorta.

Which part of the respiratory system is responsible for gas exchange?

• Trachea
• Alveoli
• Diaphragm
• Lungs

Answer explanation

The alveoli are tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged between the blood and air.

What happens during inhalation in the respiratory system?

• Carbon dioxide is removed from the blood
• Oxygen enters the blood from the lungs
• The diaphragm relaxes
• The trachea closes

Answer explanation

During inhalation, oxygen is drawn into the lungs, where it moves from the alveoli into the blood.

Which muscle helps control the breathing process by expanding and contracting the lungs?

• Cardiac muscle
• Skeletal muscle
• Diaphragm
• Smooth muscle

Answer explanation

The diaphragm contracts and relaxes, controlling the expansion and contraction of the lungs during breathing.

What part of the brain controls involuntary actions such as heart rate and breathing?

• Cerebellum
• Brainstem
• Cerebrum
• Spinal cord

Answer explanation

The brainstem controls basic involuntary functions, including heart rate, breathing, and blood pressure.

What type of muscle is responsible for moving your bones and is under your control?

• Cardiac muscle
• Skeletal muscle
• Smooth muscle
• Voluntary muscle

Answer explanation

Skeletal muscles are voluntary muscles that are attached to bones and control body movement.

Which of the following is true about smooth muscle?

• It is controlled by the brain
• It makes up the muscles of the heart
• It works automatically within organs like the stomach
• It is attached to bones and helps with movement

Answer explanation

Smooth muscle works automatically and is found in organs like the stomach and intestines, helping with processes like digestion.