Test your knowledge on the human body! Quiz


By: J.P. Naomi

6 Min Quiz

Image: Shutterstock

About This Quiz

You are human, and you have a body - do you know everything about it? Test your skills and find out if you are the master of your own body or if your body controls you!

How many bones are in the body?

The human skeleton has 270 bones at birth, and due to fusion of bones as we grow, adults have 206 bones.


How much blood is circulating in your body?

It takes about 20 seconds for a red blood cell to circle the whole body, and the lifetime of a red blood cell is about 120 days.


Which of the following is NOT a type of blood?

There are four types of blood: A, B, AB, and O. Each letter stands for a specific protein that is found on the surface of red blood cells.


Your hair is made up of what protein?

The main structural component of hair is a fibrous protein called keratin. It also forms parts of feathers, claws, and horns!


How many teeth does an adult human have?

Human adults generally have 32 teeth including 8 incisors, 4 canines, 8 premolars, and 12 molars (which includes 4 wisdom teeth).


What is one of the hormones produced by islet cells of the pancreas?

Insulin, glucagon, and other hormones are produced by islet cells to regulate blood sugar levels.


What gland secretes tears?

The lacrimal glands are almond-shaped and found in the upper outside part of each eye.


What is the largest part of the brain?

The cerebrum is described as controlling the higher brain function such as thought and action, while the cerebellum is associated with regulation and coordination of movement, posture, and balance.


Oxygenated blood travels through the body in ___________.

Hemogloblin is able to bind up to four molecules of oxygen to be carried within red blood cells.


Deoxygenated blood travels in ___________ through the body back to the heart.

Deoxygenated blood enters the heart and goes through the pulmonary artery to the lungs where it becomes oxygenated blood again.


What is the average body temperature of an adult human?

Normal human body temperatures can vary in a small range, but generally it is said that body temperature is 98.6 degrees Fahrenheit, or 37 degrees Celsius.


Which organ system is responsible for the breakdown of food and extraction of nutrients for the body?

Digestion comprises all of the mechanical and chemical processes that provide nutrients via the mouth, esophagus, stomach and intestines.


Which organ system transports blood throughout the body?

Blood circulates through the heart to provide oxygenated blood to the arteries and tissues of the body.


Which organ system uses hormones to provide chemical communication for the body?

The endocrine glands in your body produce hormones that regulate metabolism, growth, and function of tissues, reproduction, and sleep.


Which organ system is responsible for bringing air into the body?

Your body takes in oxygen and returns carbon dioxide in the gas exchange that occurs in your respiratory system.


Which organ system allows for humans to produce offspring?

The reproductive system comprises the sex organs for the purpose of sexual reproduction, as well as other substances such as fluids, hormones, and pheromones.


Which system in the body coordinates voluntary and involuntary actions and transmits signals to and from different parts of the body?

The nervous system of vertebrates has two main parts: the central nervous system, containing the brain and spinal cord, and the peripheral nervous system, consisting mainly of the nerves.


What is the actual anatomical description of the "funny bone"?

It is not actually a bone! The ulnar nerve sends signals to and from the fourth and fifth fingers.


Which organ is responsible for the production and removal of blood cells and also is part of the immune system?

Erythrocytes, called red blood cells are stored and also removed in the spleen, which also recycles iron.


Eructation, the release of gas from the digestive tract through the mouth, is commonly known as:

In some cultures, Chinese and Indian for example, burping is acceptable in certain situations, however in North America and European countries, as wel as in Japan, burping during a meal is considered bad manners.


Inadequate digestion of proteins in your intestines results in the fermentation of some foods and is a cause of _______________.

Your body does best with a high-fiber diet, ideally with about 25–30 grams of fiber every day.


The dermis and epidermis are layers of the __________.

The epidermis is your outermost protective layer of skin, provides a waterproof barrier to the outside world, while underneath, the dermis, contains connective tissue, hair follicles, and sweat glands.


What pigment present in the skin is responsible for the color of a person's skin?

Melanin is produced by cells called melanocytes, and the varying amounts produced by some individuals and ethnic groups allows for the varying skin tones we observe throughout the world.


The neural structure responsible for your sense of smell is the __________________.

The olfactory bulb transmits smell information from the nose to the brain, so is needed for a proper sense of smell.


How long does an oocyte (the egg) survive after ovulation?

During ovulation, which occurs approximately once every month, a mature egg is released from the ovary, moved down the fallopian tube, and awaits fertilization.


How long does it take for a sperm to fully mature?

Millions of new sperm are produced by a man every day, however they need time to develop and mature so that they have the ability to swim forward or fertilize an egg.


How long do sperm survive in the female reproductive tract?

Sperm can only live for a maximum of 5 days in the female reproductive tract, and only a small number of sperm will even survive that long as they travel through the reproductive tract to arrive at the egg.


If you can see clearly at 20 feet what should normally be seen at that distance, you have:

The term 20/20 vision is used to express normal sharpness or clarity of vision at a distance of 20 feet.


Which cells in the retina of your eye allow you to see in less intense light ?

photoreceptor cells ithan the other type of visual photoreceptor, cone cells. Rod cells need vitamin A to function properly. In the absence of vitamin A, a person could suffer from "night blindness".


Which cells in your eye allow you to see color?

Cone cells are less sensitive to light than rod cells, but instead allow for the perception of color and at a finer detail.


The enzyme alcohol dehydrogenase is produced by cells in the _________, where it functions to break down alcohol.

The activity of alcohol dehydrogenase is different depending on gender and age, and there are also regional differences in a population's tolerance to alcohol.


Bronchioles and alveoli are structures within the ________.

From the trachea, air goes into the lungs which branches into the bronchi then bronchioles, which then divide into microscopic alveoli, where the process of gas exchange takes place.


What is a congenital condition in which the major organs are mirrored from their normal positions?

Situs inversus occurs in about 1 in 10,000 people and its total form is characterized by complete right to left reversal of all the abdominal organs.


Starting at age 30, a physically inactive human will lose 10% of ________ mass every decade.

Some muscle loss still occurs even if you are physically active, but age-related sarcopenia typically results in decreased muscle mass compounding every 10 years.


The zygomaticus major muscle allows you to perform this facial expression:

The zygomaticus major muscle runs from the (cheekbone) to the corners of the mouth and helps to draws the angle of the mouth up and back to allow for a smile!


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