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Human Body Essentials

Biology

A collection of factual questions about human anatomy and physiology for pre-teens.

science anatomy health

18 Questions Medium Ages 9+ Sep 18, 2026

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About this Study Set

This study set covers Biology through 18 practice questions. A collection of factual questions about human anatomy and physiology for pre-teens. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 18 questions from the Human Body Essentials study set below. Each question shows the correct answer — select a study format above to practice interactively.

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

A Lungs
B Heart
C Liver
D Stomach

2 What is the largest organ in the human body?

A Brain
B Small Intestine
C Skin
D Liver

3 How many bones are typically found in an adult human skeleton?

A 106
B 206
C 306
D 406

4 Which part of the body is known as the command center of the nervous system?

A Heart
B Spinal Cord
C Brain
D Stomach

5 What substance in red blood cells carries oxygen to the rest of the body?

A Hemoglobin
B Plasma
C Platelets
D White blood cells

6 Which organ is primarily responsible for filtering waste from the blood to produce urine?

A Liver
B Lungs
C Kidneys
D Gallbladder

7 What is the main function of the small intestine during digestion?

A Producing stomach acid
B Absorbing nutrients
C Filtering toxins
D Storing waste

8 What are the chemical messengers of the endocrine system called?

A Neurons
B Enzymes
C Hormones
D Antibodies

9 Which type of blood vessel carries oxygen-rich blood away from the heart?

A Vein
B Capillary
C Artery
D Venule

10 What is the primary function of the diaphragm muscle?

A Digesting food
B Pumping blood
C Assisting with breathing
D Filtering waste

11 Which mineral is most important for the strength of human bones and teeth?

A Iron
B Calcium
C Potassium
D Sodium

12 What is the name of the pigment that gives skin and hair their color?

A Keratin
B Hemoglobin
C Melanin
D Collagen

13 Which of these is the body's first line of defense against pathogens?

A Skin
B Stomach acid
C White blood cells
D Antibodies

14 What is the hardest substance in the human body?

A Bone marrow
B Tooth enamel
C Finger nails
D Rib cage

15 Which part of the eye controls the amount of light that enters?

A Cornea
B Retina
C Pupil
D Lens

16 Approximately how much of the human body is made up of water?

A 30 percent
B 60 percent
C 80 percent
D 95 percent

17 Which type of joint allows for the widest range of motion, such as in the shoulder?

A Hinge joint
B Ball-and-socket joint
C Pivot joint
D Gliding joint

18 What is the primary role of white blood cells in the immune system?

A Carrying oxygen
B Clotting blood
C Fighting infection
D Producing energy

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