Human Anatomy

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Unequal pupil size, also known as anisocoria, naturally occurs in 20 percent of the population. However, it can also be a sign of a serious medical problem, according to About.com. This is why looking closely at the diameter of your pupils is a part of most medical and trauma assessments.

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  • Where is the brain located?

    Q: Where is the brain located?

    A: The brain is located in the top part of the head called the skull. The skull, which is made up of 28 bones, serves the sole purpose of protecting the brain from injury and trauma.
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  • What is the trachea?

    Q: What is the trachea?

    A: The trachea carries the air necessary for respiration for many types of animals. Both vertebrates and invertebrates possess tracheae, but in many invertebrates, the trachea is often a branching structure that carries gases directly to and from the animal's cells. In many vertebrates, the trachea is a structure that carries air to the lungs, organs that are dedicated specifically to gas exchange.
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  • What is the function of the heartstrings?

    Q: What is the function of the heartstrings?

    A: The function of the heartstrings is that of an information transmitter. The information transmitted is the increase and decrease of tension from the papillary muscles to the three valve cusps of the right atrioventricular (AV) valve. This information causes the valve cusps to open and close.
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  • How many times do you blink in a day?

    Q: How many times do you blink in a day?

    A: The average person blinks 21,600 times per day. Typically, a person blinks every four seconds, adding up to 15 blinks per minute and 900 blinks per hour. Weekly, the average person blinks 151,200 times. That adds up to nearly 8 million blinks per year.
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  • How long can the human intestine stretch?

    Q: How long can the human intestine stretch?

    A: The combined length of the small and large intestines averages 25 feet long. Individually, the uncoiled small intestine has an average length of 20 feet, while the large intestine has an average length of 5 feet. The length of the intestines allows for enough time for nutrients to be absorbed before waste is expelled from the body.
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  • What causes lack of oxygen?

    Q: What causes lack of oxygen?

    A: Lack of oxygen, or hypoxia, can be caused by a wide range of medical and environmental factors. Externally, lack of oxygen is usually the result of exposure to low-oxygen environments, such as those at high altitudes. This is why the FAA recommends that pilots use supplemental oxygen for altitudes over 10,000 feet in the day and 6,000 feet at night, according to About.com.
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  • What is the average height for an adult?

    Q: What is the average height for an adult?

    A: The Centers for Disease Control and Prevention identifies the average height for American women as about 5 feet, 4 inches tall. The average man is just over 5 feet, 9 inches tall.
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  • What is a high instep?

    Q: What is a high instep?

    A: A high instep is a type of foot structure in which the arch of the foot does not fall flat when bearing weight. This condition, also known as a supinated foot and Pes Cavus, occurs in about 8 to 15 per cent of the population, according to MedicMD.
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  • Why are fingertips very sensitive to touch?

    Q: Why are fingertips very sensitive to touch?

    A: Fingertips are very sensitive to touch because they contain a high number of nerve endings. According to the Biology Encyclopedia, areas with more nerve endings are more sensitive to touch.
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  • What does the skeletal system consist of?

    Q: What does the skeletal system consist of?

    A: The skeletal system consists of 206 bones and their associated tissues, including the cartilage, ligaments, tendons and joints. Its functions are supporting the body and protecting the vital organs. It also serves as anchorage for the action of muscles.
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  • When do men stop growing?

    Q: When do men stop growing?

    A: Most males have reached their full height by age 16, but their muscles still grow. Much of the height increase comes from a growth spurt between ages 12 and 16. During this period, boys often add as many as 12 inches. They also put on weight, and this gain typically ranges from 15 to 65 pounds.
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  • Are attached earlobes dominant or recessive?

    Q: Are attached earlobes dominant or recessive?

    A: Attached earlobes are considered to be recessive. Free earlobes are a dominant trait. This means that far more people have earlobes that are unattached.
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  • What does it mean when your nose itches?

    Q: What does it mean when your nose itches?

    A: An itchy nose may indicate allergies, most notably to animals, including cats, dogs, birds, seasonal allergies like hay fever, food, or the start of the common cold. It may also be the result of dry skin.
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  • How many body parts do humans have?

    Q: How many body parts do humans have?

    A: Humans have many body parts including 206 bones and more than 600 muscles. Scientists discovered a new body part, a ligament in the knee now called anterolateral ligament in 2013 at the University of Leuven in Belgium.
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  • What is the dirtiest place in the human body?

    Q: What is the dirtiest place in the human body?

    A: The mouth is considered the dirtiest place in the human body. It carries the largest amount of bacteria and germs.
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  • At what age does your head stop growing?

    Q: At what age does your head stop growing?

    A: Duke Magazine reports that the bones in the head continue to grow throughout a person's lifetime. The cheekbones move backward and the forehead moves forward as a person ages. The facial bones also seem to tilt forward as a person gets older.
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  • How do you get a defined cheekbone?

    Q: How do you get a defined cheekbone?

    A: The easiest way to achieve the appearance of defined cheekbones is through the use of special light-and-shadow tricks with makeup. Defined cheekbones are also sought after through a variety of methods, such as facial exercises, contouring tricks and surgical augmentation. Non-invasive procedures, such as Botox and Juvederm injections, are also used to slightly alter the shape of the face and create the appearance of better-defined cheekbones.
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  • What is the difference between veins, arteries and capillaries?

    Q: What is the difference between veins, arteries and capillaries?

    A: According to The Franklin Institute, there are three types of blood vessels, each with its own function. Veins carry blood back to the heart, arteries carry blood away from the heart and capillaries connect arteries to veins.
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  • Why do people snort when they laugh?

    Q: Why do people snort when they laugh?

    A: People snort when they laugh because they are also exhaling through the nose. The snorting sound, similar to snoring, is caused by an obstruction in the airway as the breath is exhaled.
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  • How much food does the average person eat in a day?

    Q: How much food does the average person eat in a day?

    A: An average person eats about 2000 calories a day, according to a study conducted by the University of Westminster's Human Performance Laboratory. The six women studied consumed between 1770 to 2600 calories a day, as published in the Mirror.
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  • Can the veins in your body reach around the world?

    Q: Can the veins in your body reach around the world?

    A: When laid out back-to-back in a single line, the blood vessels of one human being are long enough to wrap around the world more than two times, according to The Franklin Institute. This equals a length of 60,000 to 100,000 miles long, depending on the individual.
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