Organs

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Human skin replaces itself approximately once every 27 days, according to WebMD. The process of skin renewal occurs through exfoliation.

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  • What do lymph nodes do?

    Q: What do lymph nodes do?

    A: Lymph nodes are tiny structures that help the body filter harmful and unhealthy substances, especially those that lead to infection. Cancer.org explains that each lymph node is packed with immune cells that help the body fight off infections by attacking germs carried to the nodes through lymph fluid.
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  • How long does it take for skin to replace itself?

    Q: How long does it take for skin to replace itself?

    A: Human skin replaces itself approximately once every 27 days, according to WebMD. The process of skin renewal occurs through exfoliation.
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  • How big is the human stomach?

    Q: How big is the human stomach?

    A: The stomach of an adult is about the size of a fist. This organ has the ability to expand as much as 40 times its original size in order to hold a big meal or large fluid intake.
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  • What does the prefrontal cortex do?

    Q: What does the prefrontal cortex do?

    A: The University of Washington explains that the prefrontal cortex is responsible for activities that include problem solving, processing complex thoughts and causing emotions. The prefrontal cortex is located at the front of the brain, in the outer layer of structure called the cerebral cortex.
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  • What does the liver do in the digestive system?

    Q: What does the liver do in the digestive system?

    A: The liver is an essential part of the human digestive system. It is an accessory organ of the digestive system that assists with digestive processes without being directly involved with food digestion. The liver assists the digestive system by secreting bile and bile salts to help emulsify fats and aid in their digestion in the small intestine.
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  • Are all babies born with blue eyes?

    Q: Are all babies born with blue eyes?

    A: Caucasian babies are generally born with bluish-gray eyes, while babies of African-American or Asian descent usually have brown eyes at birth. Because the baby has just emerged from the dark, true eye color takes about a year to develop.
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  • What regulates the amount of light entering the eye?

    Q: What regulates the amount of light entering the eye?

    A: The amount of light entering the human eye is regulated by the diameter of the pupil. The pupil is the dark spot at the center of a healthy iris that, according to the National Institutes of Health, rests immediately in front of the eye's lens.
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  • What is the main function of the large intestine?

    Q: What is the main function of the large intestine?

    A: The main function of the large intestine is to absorb water and remove solid waste from the body. The organ takes approximately 16 hours to complete the digestion of food. This organ is the last part of the digestive system and stretches from the ileocecal valve to the anus.
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  • What connects the two hemispheres of the brain?

    Q: What connects the two hemispheres of the brain?

    A: According to About.com Biology, the corpus callosum connects the brain's two hemispheres. Innerbody.com reports that the corpus callosum is a broad arch that is divided into a curved front end called the genu and a backward-pointing portion called the rostrum, which tapers downward to connect with the lamina terminalis.
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  • What part of the ear contains the sensory receptors for hearing?

    Q: What part of the ear contains the sensory receptors for hearing?

    A: The part of the ear that contains the sensory organs for hearing and balance is the inner ear, says the American Speech-Language-Hearing Association. The cochlea is the inner ear’s hearing part, while the semicircular canals are part of the balance system.
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  • How much skin do we shed in a day?

    Q: How much skin do we shed in a day?

    A: Humans lose between 30,000 and 40,000 skin cells every hour. During a 24-hour period, a person loses almost a million skin cells. The human body is made up of roughly 10 trillion cells in total, 1.6 trillion of which are skin cells.
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  • What does the brain stem do?

    Q: What does the brain stem do?

    A: The brain stem controls a number of basic bodily processes that are necessary for life. According to Brain-Guide.org, the brain stem functions as an autopilot for the human body, as it regulates such activities as breathing, digestion, heart rate, blood pressure and arousal. Additionally, the brain stem, which is located at the junction of the spinal cord, serves as a conduit through which information and instructions pass.
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  • Why do my eyelids swell tremendously when I cry?

    Q: Why do my eyelids swell tremendously when I cry?

    A: The tears that keep the eyes moist are produced by the conjuctiva, while the tears produced by crying come from the lachrymal glands located in the eyelids. According to Moment of Science, the chemical composition of tears from the lachrymal glands leads to puffiness in the eyelids.
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  • At what age does the brain stop developing?

    Q: At what age does the brain stop developing?

    A: The human brain does not stop developing until around age 25. Parts of the brain that are involved in decision making do not fully develop until that age. However, female brains typically develop around two years earlier than male brains.
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  • What role do the lungs have in the excretory system?

    Q: What role do the lungs have in the excretory system?

    A: According to the New Health Guide Organization, the role the lungs play in the excretory system is to dispose of carbon dioxide through exhalation. This occurs when cells release carbon dioxide into the bloodstream. The blood then travels to the lungs where the carbon dioxide is transferred to the lungs.
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  • What part of the brain controls dreams?

    Q: What part of the brain controls dreams?

    A: Dreams are controlled by a part of the brain called the cerebral cortex. During REM sleep, signals sent from another part of the brain, the pons, are relayed through the thalamus to the cerebral cortex, and it is the cerebral cortex's attempts to make sense of these signals that causes dreaming.
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  • Why is the right lung larger than the left?

    Q: Why is the right lung larger than the left?

    A: The right lung is larger than the left lung because it has three lobes. In contrast, the left lung has only two lobes. The lungs have a conical shape.
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  • How much of the brain do people use?

    Q: How much of the brain do people use?

    A: Neuroscientists suggest that the brain is always firing or using its cells, the neurons, to perform functions. Over the course of a normal day, most people use all of their brain capacity. Previous myths stated that humans only used 10 percent of their brains.
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  • What sounds can only kids hear?

    Q: What sounds can only kids hear?

    A: According to Scientific American, kids can hear sounds above about 16 Hz, which are difficult or impossible for adults to hear. As humans age, presbycusis or age related hearing frequency loss begins, starting at around age 18 in most individuals and continuing throughout life.
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  • Why is skin considered an organ?

    Q: Why is skin considered an organ?

    A: Skin is considered an organ because it meets the definition of an organ, which is a group of related cells that combine together to perform one or more specific functions within the body. Skin performs several functions vital to the survival and health of the body, so deserves the label of organ.
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  • Do humans have hair on their tongues?

    Q: Do humans have hair on their tongues?

    A: Humans do not have hair on their tongues. Microvilli, which are present on the human tongue, sometimes are confused with hair. Mircovilli are microscopic membrane protrusions on the taste buds.
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