Human Anatomy

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 are the roles of joints, bones and muscles?

    Q: What are the roles of joints, bones and muscles?

    A: Bones, muscles and joints play an important role in the human body. They, along with tendons, ligaments and cartilage, form the musculoskeletal system and enable us to perform physical activity. The musculoskeletal system protects and supports internal organs, allows movement, gives the body its shape, produces blood cells, stores calcium and phosphorus, and produces heat.
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  • What causes a body to jerk during sleep?

    Q: What causes a body to jerk during sleep?

    A: According to the National Institute of Neurological Disorders and Stroke (NINDS), the sudden, involuntary jerking of a muscle or group of muscles while drifting off to sleep is called myoclonus. It is caused by sudden muscle contractions, also known as positive myoclonus, or muscle relaxation, which is referred to as negative myoclonus. Myoclonic jerks may occur alone or in sequence, in a pattern or without pattern.
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  • On average, how many hairs are on a human head?

    Q: On average, how many hairs are on a human head?

    A: On average, there are 100,000 hairs on a human head. Everyone is born with a set amount of hair follicles. Hair grows from follicles that enclose the hair root in the person's scalp. The reason children's hair looks thicker is because their heads are smaller.
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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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  • What happens when too much adrenaline is produced?

    Q: What happens when too much adrenaline is produced?

    A: When the body produces too much adrenaline, a person likely has phaeochromocytoma, a rare tumor of the adrenal medulla, according to the Society for Endocrinology. Symptoms of this condition include high blood pressure, fast heartbeat, palpitations, excessive sweating, weight loss and anxiety.
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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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  • What is the most popular eye color?

    Q: What is the most popular eye color?

    A: Brown eyes are the most popular eye color in the world, in terms of prevalence. More than 55 percent of the world's population has brown eyes.
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  • What part of the brain controls sight?

    Q: What part of the brain controls sight?

    A: Located at the back of the brain, the occipital lobes are the part of it responsible for sight. They are part of the cerebral cortex. The temporal lobes and the parietal lobe also play a role in visual perception.
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  • How do you get pregnant with quintuplets?

    Q: How do you get pregnant with quintuplets?

    A: According to the American Pregnancy Association, there are two ways that a woman can become pregnant with more than one child at a time, either multiple eggs are fertilized at the same time, or one fertilized egg divides into multiple embryos. The chances of becoming pregnant with more than baby is low however. In particular quintuplets are very rare, accounting for less than 41 births in 2011 out of almost four million total births, as noted by Multiples of America.
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  • What is the capacity of a human stomach?

    Q: What is the capacity of a human stomach?

    A: According to the National Center for Biotechnology Information (NCBI), the human stomach is an elastic organ that can expand to hold from 0.25 to 1.7 L of contents without causing any discomfort. The average human stomach has a capacity of roughly 1 L, or a little more than a quart.
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  • What are the parts of the human leg?

    Q: What are the parts of the human leg?

    A: Parts of the human leg are bones, muscles, tendons, ligaments, nerves and blood vessels. The bones of the leg, from top to bottom, are the femur, a long bone with a ball-shaped head that fits into the socket of the hip bone. The lower end of the femur lies above the patella, which lies behind the knee.
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  • At what age does a girl stop growing?

    Q: At what age does a girl stop growing?

    A: On average, girls reach their final adult height and stop growing by age 14 or 15, though this figure skews either younger or older depending on when puberty begins. Most girls experience a growth spurt between ages 10 to14, and a female's rate of growth peaks around two years after puberty begins, which is usually around age 12.
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  • What is the difference between a belch and a burp?

    Q: What is the difference between a belch and a burp?

    A: According to the Mayo Clinic, there is no difference between a belch and a burp. By performing this reflexive action, the body removes excess air that is in the stomach.
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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 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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  • What is the relationship between anatomy and physiology?

    Q: What is the relationship between anatomy and physiology?

    A: Anatomy is the study of form, while physiology is the study of function, according to Wikipedia. Anatomy is the scientific study of the structure of organisms including their systems, organs and tissues. It details the appearance and position of various parts, their material compositions and their locations and relationships with other parts. Physiology deals respectively with the functions of those anatomical parts and the chemical processes involved.
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  • What is the relationship between intelligence and creativity?

    Q: What is the relationship between intelligence and creativity?

    A: The relationship between intelligence and creativity is not fully understood, although recent research suggests that intelligent people naturally crave higher levels of creativity. Research also suggests that intelligence and creativity overlap, meaning that intelligent individuals have a high capacity for creativity, and vice versa. This is somewhat counter to previous ideas that suggested creativity raises intelligence levels.
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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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  • What are all the finger and toe bones called?

    Q: What are all the finger and toe bones called?

    A: The finger and toe bones are called phalanges. Each finger and toe, with the exception of the thumb and great toe, has proximal, middle and distal phalanges.
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  • What is the function of the uvula?

    Q: What is the function of the uvula?

    A: Although there is some uncertainly regarding the function of the uvula, experts believe that this small flap-like structure in the back of the throat plays important roles in speech and swallowing. The uvula contains glands that secrete a large amount of saliva, which aids in digestion, keeps the mouth moist and prevents airborne pathogens from entering the respiratory canal.
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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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