Buzz·Updated on Jun 23, 2019. Posted on Oct 28, 2017If You Get More Than 10 Things Right On This Quiz, You Should Be A DoctorOr: how well did you pay attention in bio 101?by Pepe H.BuzzFeed Staff, MexicoFacebookPinterestTwitterMailLink What is the pigment that affects skin color? Getty Images Melanin Correct Incorrect Melanin Hemoglobin Correct Incorrect Hemoglobin Endorphin Correct Incorrect Endorphin Bilirubin Correct Incorrect Bilirubin Correct! Wrong! Melanin It's also responsible for the pigmentation of moles. The more melanin there is in your skin, the darker it is. Via Getty Images How many organ systems does the human body have? Getty Images 5 Correct Incorrect 5 7 Correct Incorrect 7 11 Correct Incorrect 11 15 Correct Incorrect 15 Correct! Wrong! 11 The circulatory, digestive, endocrine, integumentary, lymphatic, muscular, nervous, renal, reproductive, respiratory and skeletal systems. Via Getty Images Which organ has a layer of muscle that allows it to contract? Getty Images The lungs Correct Incorrect The lungs The pancreas Correct Incorrect The pancreas The stomach Correct Incorrect The stomach The fibula Correct Incorrect The fibula Correct! Wrong! The stomach You can blame those muscles for stomach cramps, too. Via Getty Images Which is the biggest organ in the body? Getty Images The skin Correct Incorrect The skin The liver Correct Incorrect The liver The stomach Correct Incorrect The stomach The large intestine Correct Incorrect The large intestine Correct! Wrong! The skin This complicated system of glands and connective tissue is what protects your internal organs from the outside world. Tap to play or pause GIF Tap to play or pause GIF Via FOX Which is the largest muscle in the human body? Getty Images Pectorals Correct Incorrect Pectorals Biceps Correct Incorrect Biceps The gluteus maximus Correct Incorrect The gluteus maximus The heart <3 Correct Incorrect The heart <3 Correct! Wrong! The gluteus maximus And all those squats can make it even bigger, depending on how you do them. Tap to play or pause GIF Tap to play or pause GIF Via imgur.com How long is the small intestine? Getty Images 3-6 feet Correct Incorrect 3-6 feet 33-45 feet Correct Incorrect 33-45 feet 50-60 feet Correct Incorrect 50-60 feet 23-30 feet Correct Incorrect 23-30 feet Correct! Wrong! Between 23 and 30 feet long. And you thought your earbuds were tangled. Via Getty Images How many bones does the average adult have? Getty Images 106 Correct Incorrect 106 206 Correct Incorrect 206 306 Correct Incorrect 306 406 Correct Incorrect 406 Correct! Wrong! 206 Weird to think about having a whole entire skeleton inside ya, but it's true! Tap to play or pause GIF Tap to play or pause GIF Via Kiszkiloszki Which organ does cirrhosis affect? Getty Images Brain Correct Incorrect Brain Liver Correct Incorrect Liver Lungs Correct Incorrect Lungs Heart Correct Incorrect Heart Correct! Wrong! The liver Take care of it! Via Getty Images How is DNA stored? Getty Images In the hair Correct Incorrect In the hair In the blood Correct Incorrect In the blood In chromosomes Correct Incorrect In chromosomes ( ͡° ͜ʖ ͡° ) Correct Incorrect ( ͡° ͜ʖ ͡° ) Correct! Wrong! In chromosomes. In the center of most cells in the body, there is DNA, which is found in coiled units called chromosomes that store the genetic information that makes you, you. Via Getty Images What do white blood cells do? Getty Images They're part of the immune system. Correct Incorrect They're part of the immune system. They transport oxygen to your brain. Correct Incorrect They transport oxygen to your brain. They regulate metabolism. Correct Incorrect They regulate metabolism. They transport hormones through your body. Correct Incorrect They transport hormones through your body. Correct! Wrong! They're part of your immune system. Leucocytes, or white blood cells, help fight against the germs and bacteria that attack the human body. Via Getty Images Red blood cells are shaped most like... Getty Images Spheres Correct Incorrect Spheres Stars Correct Incorrect Stars Discs Correct Incorrect Discs Dinosaurs Correct Incorrect Dinosaurs Correct! Wrong! Discs Red blood cells' unique shape allows them to transport oxygen through your blood and remove carbon dioxide. Tap to play or pause GIF Tap to play or pause GIF Via Giphy What does AIDS stand for? Getty Images Acquired Immune Deficiency Syndrome Correct Incorrect Acquired Immune Deficiency Syndrome Aleatory Immune Deficiency Syndrome Correct Incorrect Aleatory Immune Deficiency Syndrome Abrasive Immune Deficiency Syndrome Correct Incorrect Abrasive Immune Deficiency Syndrome Acquired Deficient Immune Syndrome Correct Incorrect Acquired Deficient Immune Syndrome Correct! Wrong! Acquired Immune Deficiency Syndrome People with AIDS are at risk for potentially life-threatening infections, neurological problems, and tumors. Via Getty Images What causes athlete's foot? Getty Images Dry skin Correct Incorrect Dry skin A fungus Correct Incorrect A fungus Poor hygiene Correct Incorrect Poor hygiene A virus Correct Incorrect A virus Correct! Wrong! A fungus The dark and humid insides of your shoes are the perfect scenario for these little fellas to grow. Tap to play or pause GIF Tap to play or pause GIF Via Cheezburger What is the active ingredient in aspirin? Getty Images Acetylsalicylic acid Correct Incorrect Acetylsalicylic acid Chiquitolina Correct Incorrect Chiquitolina Penicillin Correct Incorrect Penicillin Ascorbic acid Correct Incorrect Ascorbic acid Correct! Wrong! Acetylsalicylic acid Acetylsalicylic acid works against natural physiological processes that cause pain and inflammation. Via Imgur This post was translated from Spanish.