Human Anatomy

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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 is the hardest tissue in the body?

    Q: What is the hardest tissue in the body?

    A: According to WebMD, the hardest tissue in the human body is tooth enamel. Tooth enamel is the thin, hard, white covering that protects the dentin of the teeth.
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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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  • What causes flushed cheeks?

    Q: What causes flushed cheeks?

    A: According to the National Health Service of the U.K., flushed cheeks, or "blushing," is a result of the involuntary nervous system responding to stress or embarrassment. Your face muscles relax, which allows your face's blood vessels to expand and take in more blood, causing the reddish hue of blushing.
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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 parts of the human body never stop growing?

    Q: What parts of the human body never stop growing?

    A: Italian scientists have confirmed that the parts of the body that consist of cartilage continue to grow until the day of death. This includes one's nose and ears. Earlobes contain cartilage but also elongate due to gravitational force.
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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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  • What causes yawning?

    Q: What causes yawning?

    A: The theories regarding why people yawn range from boredom to cooling the brain to helping the brain to stay more alert. Regardless of what causes yawning, it is widely accepted that yawning is contagious.
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  • How much do humans sleep in a lifetime?

    Q: How much do humans sleep in a lifetime?

    A: According to the National Institutes of Health, an average human spends about one third of his life sleeping. Assuming an average human life span of 78 years, that equates to about 26 years each person spends sleeping in his lifetime.
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  • How does skin regulate body temperature?

    Q: How does skin regulate body temperature?

    A: Sweat glands and fatty layers in the skin help to regulate body temperature in mammals. When the outside temperature is high, sweat glands release bodily fluids combined with salt to keep the body temperature from getting too high. When the outside temperature is low, fatty layers on the skin act as insulation, trapping heat and keeping it from leaving the body.
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  • What is the length of an average walking stride?

    Q: What is the length of an average walking stride?

    A: The length of an average walking stride is 62 inches. People frequently mistake stride for step length, or wrongly assume they are one in the same. Step length is defined as the distance between the heel strike of one foot and the heel strike of the opposite foot. On the other hand, stride refers to the consecutive heel strikes of the same foot.
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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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  • Why is one pupil bigger than the other?

    Q: Why is one pupil bigger than the other?

    A: 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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  • 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 an average wrist size?

    Q: What is an average wrist size?

    A: According to Watch Cases, the average wrist size for adults is 7.17 inches. This measurement varies according to the height, build and age of a person.
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  • How do you put someone to sleep fast using pressure points?

    Q: How do you put someone to sleep fast using pressure points?

    A: An acupressure practitioner can send someone to sleep quickly by applying pressure on one or several of his pressure points. For example, applying pressure on the middle of the inner side of the wrist, between the eyebrows or on the center of the breastbone can help induce quick sleep.
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  • At what age is the human brain fully developed?

    Q: At what age is the human brain fully developed?

    A: While no specific age has been identified as the age at which the human brain is fully mature, the Washington Post relates that many scientists agree that the brain does not reach maturity until at least the mid-20s. Some studies suggest that the brain continues to develop into the early 30s.
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  • Why are females more flexible than males?

    Q: Why are females more flexible than males?

    A: Women’s bodies are more flexible than men's to allow women to carry and eventually hold a baby, according to Harvard University. This is caused in part by the hormone estrogen, which promotes the lengthening of muscles, according to Krav Maga for Fitness.
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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 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 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 are two factors that contribute to knee stability?

    Q: What are two factors that contribute to knee stability?

    A: According to the Western Journal of Medicine, the knee is stabilized by the shape of the joint and the ligaments accompanying it. The joint is shaped by the local bone protuberances and the surrounding cartilage. The many ligaments that support the knee joint include the cruciate (cross-shaped) and collateral ligaments.
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