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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  • How Many Pulse Points Are in the Human Body?

    Q: How Many Pulse Points Are in the Human Body?

    A: There are eight main pulse points in the human body. These pulse points are in the wrists, at the sides of the lower jaw, at the temples, on the side of the neck, on the inner biceps, behind the knee, in the groin and on the upper part of the foot. All arteries have a pulse, which can be felt where they run close to the skin.
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  • Why Do Optical Illusions Work?

    Q: Why Do Optical Illusions Work?

    A: Optical illusions work because humans have binocular vision, which allows people to see different objects with each eye and sometimes the images do not merge properly. The brain must also interpret the signals correctly. Persistence of vision can also make optical illusions work.
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  • What Are Sensory Skills?

    Q: What Are Sensory Skills?

    A: Sensory skills are the act of seeing, smelling, touching, tasting and hearing to better engage in daily activities. According to the Public Broadcasting Service, sensory skills are vital to a child's development and help people of all ages perceive their surroundings.
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  • Why Does Heat Make You Sleepy?

    Q: Why Does Heat Make You Sleepy?

    A: Heat makes people sleepy because of the mechanisms the body uses to keep itself cool, lack of adjustment to warm temperatures and lack of sleep due to exposure to hot, humid nights, according to Global Bioweather. The human body takes several days to acclimate to the heat, and a person who has not acclimatized to warm weather is likely to feel sluggish. Oxygen levels and blood pressure are also lower.
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  • Why Is the Sense of Touch Important?

    Q: Why Is the Sense of Touch Important?

    A: The sense of touch is important because it allows animals to derive information about their surroundings when the other senses are not appropriate. Some animals rely on the sense of touch more than others do. Typically, animals with a very poor sense of sight develop an exquisite sense of touch.
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  • What Part of the Brain Do We Use When We Dream?

    Q: What Part of the Brain Do We Use When We Dream?

    A: According to Bryn Mawr College, the pons is largely responsible for dreaming because of its role in regulating REM sleep, which is vital for dreaming. Damage to the pons can result in loss of dreaming sleep.
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  • Does Everybody Have a Birthmark?

    Q: Does Everybody Have a Birthmark?

    A: Everybody is not born with a birthmark. More than 10 babies out of 100 have a birthmark when they are born or develop one shortly after birth.
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  • What Is the Approximate Range of Human Hearing?

    Q: What Is the Approximate Range of Human Hearing?

    A: The approximate range for human hearing is between 20 to 20,000 Hertz (Hz). This number is greatly dependent on the distance of the noise from the person and the type of noise that is being exhibited.
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  • What Is the Function of Joints?

    Q: What Is the Function of Joints?

    A: A joint's function is to bear weight, perform work and exhibit a particular range of motion during movement where two or more bones come together for the purpose of movement. A joint moves when the muscles crossing it contract.
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  • What Is the Torso Area of the Body?

    Q: What Is the Torso Area of the Body?

    A: The torso is the main part of the body to which the neck and limbs attach, and it is a common feature of all vertebrates. The torso holds the body’s major internal organs except for the brain. Often, scientists refer to either the lower torso or the upper torso for better clarity.
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  • Does the Time of Day Affect Your Body Temperature?

    Q: Does the Time of Day Affect Your Body Temperature?

    A: According to the National Institute of General Medical Sciences, the time of day affects the body temperature through a physiological phenomenon called circadian rhythm. The UCLA Sleep Disorders Center explains this cycle is controlled by small nuclei in the brain, called the suprachiasmatic nuclei, along with other circadian rhythms.
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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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  • 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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  • What Is the Opposite Side of the Elbow Called?

    Q: What Is the Opposite Side of the Elbow Called?

    A: The opposite side of the elbow is called the antecubital space, the cubital fossa or the chelidon. Some people call it the "elbow pit," which is intended to echo the word "armpit."
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  • Where Is the Navel Located on the Human Body?

    Q: Where Is the Navel Located on the Human Body?

    A: The navel is located on the front of the body, roughly half way up the abdomen. There is a great variety in navel size and shape among humans.
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  • What Do the Different Types of Chins Mean?

    Q: What Do the Different Types of Chins Mean?

    A: In the Chinese face reading practice, a round chin belongs to a person who is supportive, generous, sympathetic, kind and family-minded, whereas a square chin alludes to a more stubborn individual. A pointed or narrow chin characterizes a hot-tempered, stubborn, fiery, sensitive, fun-loving and sociable person who also loves to gossip.
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  • How Many Taste Buds Are on the Human Tongue?

    Q: How Many Taste Buds Are on the Human Tongue?

    A: According to KidsHealth, the average human tongue has about 10,000 taste buds. In many people, there is a regular turnover every two weeks and all the taste buds are replaced.
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  • How Long Does It Take to Digest Liquids?

    Q: How Long Does It Take to Digest Liquids?

    A: On average, food takes six to eight hours to pass through the stomach and small intestines. Liquids are not digested separately from foods, and they follow the same digestion process. In liquid-only diets, the digestion process may take fewer hours, as the stomach doesn't have to mechanically break down food.
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  • What Are the Similarities Between Cat and Human Anatomy?

    Q: What Are the Similarities Between Cat and Human Anatomy?

    A: According to Melodie Anne Coffman for The Nest, cats and humans share many anatomical similarities within the lungs, heart, digestive system, urinary tract and sex organs. Cats also share very basic elements of anatomy with humans, including eyes, mouths, ears, noses, bones, tongues, teeth and skin.
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  • What Does the Left Side of Your Brain Do?

    Q: What Does the Left Side of Your Brain Do?

    A: The left side of your brain controls the muscles on the right side of your body, and it is responsible for language along with logical and mathematical thinking. Meanwhile, the right brain controls the muscles on the left side of your body, and it is associated with spatial reasoning and musical abilities.
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  • How Can I Take a Punch to the Gut?

    Q: How Can I Take a Punch to the Gut?

    A: Strong abdominal muscles are required to take a punch to the gut, as well as contraction right before the strike. There are many exercises suited to the task of developing core strength using only body weight. Weights can be added for further improvement in abdominal strength.
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