Human Anatomy

A:

The deltoid muscle is innervated by the axillary nerve. The deltoid is a triangular muscle located at the uppermost part of the arm and gives the shoulder its rounded contour. The axillary nerve extends from the brachial plexus, carrying nerve impulses to the deltoid muscle.

See Full Answer
Filed Under:
  • What is the fastest healing part of the body?

    Q: What is the fastest healing part of the body?

    A: The fastest healing part of the body is the tongue. This is due to the rich supply of blood the tongue receives, making it able to heal twice as fast as any other part of the body. This includes taste buds, which is why someone can burn taste buds eating hot food and later be able to taste perfectly fine because the taste buds have quickly healed.
    See Full Answer
    Filed Under:
  • Why are the whites of my eyes not white?

    Q: Why are the whites of my eyes not white?

    A: According to optometrist Dr. Troy L. Bedinghaus on About.com, the eyes sometimes develop a different color due to hyperbilirubinemia and subconjunctival hemorrhage. Yellow eyes, also called icterus, result from a buildup of bilirubin in the eyes.
    See Full Answer
    Filed Under:
  • Do eyes grow after birth?

    Q: Do eyes grow after birth?

    A: According to the Chicago College of Medicine, eyes do continue to grow after birth. A newborn's eyes are about 75 percent the size they are going to be when fully grown.
    See Full Answer
    Filed Under:
  • How long does it take to grow a mustache?

    Q: How long does it take to grow a mustache?

    A: The time it takes to grow a mustache depends on how fast the hair grows and the type of mustache desired. On average, hair on the body, including the face, grows at a rate of 1/2-inch per month.
    See Full Answer
    Filed Under:
  • What is the name of the gland that excretes water and salt through the skin?

    Q: What is the name of the gland that excretes water and salt through the skin?

    A: The glands that excrete water and salt through the skin are named the sudoriferous glands. These are also known as sweat glands and are divided into eccrine sweat glands and apocrine sweat glands.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • Why does asparagus make your pee smell?

    Q: Why does asparagus make your pee smell?

    A: Asparagus pee (for lack of a better term) is a centuries-old problem, and scientists still aren't sure what causes its unique odor. Adding to the uncertainty is a strange phenomenon: a portion of the population either doesn't produce the smell or can't smell it at all.
    See Full Answer
    Filed Under:
  • What are six substances transported by blood?

    Q: What are six substances transported by blood?

    A: The blood transports oxygen, carbon dioxide, nutrients, water, hormones, waste substances and heat. The waste substances are moved to the liver and kidneys, which remove toxins from the blood. Urea is moved from the liver to the kidneys.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • Why are boys taller than girls?

    Q: Why are boys taller than girls?

    A: According to the BBC, boys grow taller than girls due to the growth spurt delay boys experience during puberty, adding two more years of childhood growth. Additionally, boys grow at a faster rate during this growth spurt due to the effects of testosterone, which prompts cells to grow.
    See Full Answer
    Filed Under:
  • How many muscles are there in a human body?

    Q: How many muscles are there in a human body?

    A: According to the Library of Congress, the human body has at least 650 skeletal muscles and as many as 840 depending on what counts as a muscle. Some sources count complex muscles as a single muscle, while others count complex muscles' individual parts as separate muscles, which leads to dissent.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • Does your head grow as you get older?

    Q: Does your head grow as you get older?

    A: Duke Magazine notes that the bones in the skull continue to grow as people age. The forehead tends to move forward while the cheekbones move slightly backwards, causing subtle changes to the human face. Because the facial bones tilt forward as people age, it causes sagging of the soft tissues.
    See Full Answer
    Filed Under:
  • What part of the brain does music affect?

    Q: What part of the brain does music affect?

    A: Initially, a person's temporal and frontal lobes begin processing the sounds of music when a song begins to play, with brain cells deciphering melody, rhythm and pitch. Many researchers believe most activity concerning music happens in the brain's right hemisphere, while other researchers say it happens on both sides.
    See Full Answer
    Filed Under:
  • What parts of the body keep growing as a person ages?

    Q: What parts of the body keep growing as a person ages?

    A: There is evidence that the cranial bones, pelvic bones and ear cartilage continue to grow into adulthood. It is believed that all other body parts stop growing when one reaches maturity.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What is the area behind the knee called?

    Q: What is the area behind the knee called?

    A: The area behind the knee is called the posterior cruciate ligament (PCL), and it connects the femur, or thigh bone, to the tibia, or shin bone. The ligament prevents the tibia from moving backward to a point that can cause injury, according to the American Academy of Orthopaedic Surgeons.
    See Full Answer
    Filed Under:
  • Why do fingernails bend?

    Q: Why do fingernails bend?

    A: Fingernails bend easily if they are weakened by environmental damage, poor nutrition or illnesses. Healthy fingernails are supposed to be strong and firm and should not bend or break easily. A person with weak fingernails has a number of factors to consider in order to determine the exact cause.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under: