The human body holds more than 100 trillion cells, according to the National Institute of Child Health and Human Development. Human cells are small, too tiny to be seen without using a microscope, but they make up all of the organs and systems of...
Human bites cause trauma to the skin and can become more easily infected than animal bites because of the large amount of bacteria that is naturally found in human mouths. Because of this high potential for infection, you should always seek...
The human skull, also known as the cranium, includes the face, mandible and head. Although there is debate as to the total number of bones in the human body, most experts agree that the skull typically includes 22 bones. The skull is nearly full...
The human brain is an extremely complex organ which, among many other things, controls blood pressure and heart rate, interprets the senses, initiates body movement, and is the home of emotions and intelligence. The adult human brain weighs about...
Human teeth are hardened, bone-like structures that extend from your jaws and gums and allow you to perform various tasks related to eating, biting and tearing. These structures, which begin to form before you are born, help make everyday survival...
The Centers for Disease Control and Prevention (CDC) observes that of all the infections caused by parasites in America, about 90 percent of those are due to protozoa. The World Health Organization estimates that protozoan parasites are...
Rabies is a zoonotic disease, which means that it is passed from an animal to a human. The disease is caused by the rabies virus Rhabdoviridae lyssavirus. In the U.S. several different strains of this virus that can be found in different animals....
The human life cycle is approximately 75.3 years, according to Tulane University. It is dependent on genetics, culture, environment, social relationships, adaptation to stress, and ability and desire to sustain human existence. The human life...
Many companies market human growth supplements to individuals who want to look as young as possible for as long as possible. Several of the companies make sweeping claims about the positive benefits of human growth supplements, also called human...
Humans are constantly changing. The body, mind and metabolism of a human being continuously move from one stage of the life cycle toward the next. Advancements in medical science, nutrition, sanitation and medicine have altered the length of time...
Hair--or a lack thereof--is an identifying feature of people. Our hair defines us because it is often the first thing that people see. The average scalp contain between 100,000 and 150,000 strands of hair, according to the Library of Congress....
The human brain is part of the central nervous system. The brain is protected by the skull on the outside and meninges, a three-layer membrane, on the inside. The average weight of an adult brain is about 3 lbs. An interruption in blood flow to...
The brain is an amazing organ that weighs about 3 lbs. and is encased in a protective layer of bone called the skull. The brain is the central feature of the human body, and adds dimensions such as personality and emotions to life as well as...
According to NOVA online, the human body contains approximately 100 trillion cells. Cells in the human body constantly die and get replaced with new cells as part of the typical cell cycle. While the vast majority of cells in the human body...
According to Merck.com, human worms are intestinal parasites that feed on bowel content or suck blood from the intestinal wall. The types of intestinal worms that can affect humans include roundworms, tapeworm and flukes. According to the...
The liver is an important part of the human body, and is involved in many of the body's functions. Located in the abdomen, the liver regulates blood sugar levels and detoxifies the blood. However, when too many toxins are introduced into a...
Without your skeletal system, your body would be unsupported, and without your bones and muscles working in tandem, you would be unable to move. The muscles and bones together are often referred to as the musculo-skeletal system. Your bones also...
Over time, brain size has increased dramatically. It has become more specialized, plastic and hierarchical than the brain of any other species. Because of this, humans are able to adapt to many different kinds of environments, learn new skills and...
Human beings need to be touched; the reasons are many. Human nature almost demands us to rub what hurts, to get a hug when feeling stressed or to put a hand on the shoulder of someone in need of comfort. Human touch can facilitate communication,...
Human communication is defined as a process by which you assign and express meaning in an effort to generate a mutual understanding. Even though the vast majority of people are born with the ability to use their voice, humans must learn to...
Human colic occurs in infants and is often regarded as a condition of inconsolable, frequent crying caused by abdominal pain or discomfort. If your baby has colic, he likely will be otherwise healthy but have times of intense crying. Consult your...
The human papillomavirus is also referred to as HPV. It attacks the skin and mucous membranes of the body. According to the CDC, the human papillomavirus is actually a group of more than 100 strains of virus. Around 40 of them are transmitted...
Insulin is a vital part of the body's ability to regulate energy and metabolism. It is created in the pancreas and distributed to the body. Insulin's primary function in the body is to allow fat cells, the kidneys and the liver to use glucose or...
Your metabolism is the sum of all chemical reactions that take place in your body. Very simply, as part of your metabolic processes, you break down larger molecules obtained from your environment into smaller building blocks, and then assemble...
The human brain is a fascinating and complex organ, capable of not only running your body's essential systems, but also producing intricate memories and the ability to engage in abstract thought. The human brain has a gelatinous consistency, and...
The organ systems of the human body work together to create homeostasis, a state of functional health adequate to sustain life. The human organs within these systems work together to perform a specific function. For instance, inhalation requires...
With its unique composition of proteins, carbohydrates, fats, vitamins, minerals and other nutrients, human milk is designed to provide the ideal nutrition for an infant. Protein is a nutrient that is especially important for growth and...
Human milk contains all of the protein, fat, carbohydrates, minerals and nutrients a healthy newborn baby needs for growth and development, according to La Leche League International. Breastfeeding mothers provide their infants with antibodies...
According to MayoClinic.com, a human fitness ball--which looks like a big beach ball--can help you strengthen your core and is also good for developing flexibility and balance. It is important to choose the right size of ball for your body type,...
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