How do we smell? - Rose Eveleth. All you ever wanted to know about Germs. What would happen to your body without water? Muscular System: Facts, Functions & Diseases. While most people associate muscles with strength, they do more than assist in lifting heavy objects.
The 650 muscles in the body not only support movement — controlling walking, talking, sitting, standing, eating and other daily functions that people consciously perform — but also help to maintain posture and circulate blood and other substances throughout the body, among other functions. Muscles are often associated with activities of the legs, arms and other appendages, but muscles also produce more subtle movements, such as facial expressions, eye movements and respiration, according to the National Institutes of Health (NIH). Three types of muscles The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac, according to the NIH. Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs.
Nervous System: Facts, Function & Diseases. The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.
Vertebrates — animals with backbones and spinal columns — have central and peripheral nervous systems. The central nervous system is made up of the brain, spinal cord and retina. The peripheral nervous system consists of sensory neurons, ganglia (clusters of neurons) and nerves that connect to one another and to the central nervous system. Description of the nervous system. The Human Body: Anatomy, Facts & Functions. Human body systems.Credit: Image via Shutterstock The human body is everything that makes up, well, you.
The basic parts of the human body are the head, neck, torso, arms and legs. Body systems Our bodies consist of a number of biological systems that carry out specific functions necessary for everyday living. The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide, and hormones, around the body.
Skin: Facts, Diseases & Conditions. While it may not immediately come to mind when asked to name the body’s major organs, the integumentary system, or skin, is its largest organ.
It comprises the skin as well as hair and nails, which are appendages of the skin. In humans, this system accounts for about 15 percent of total body weight. Urinary System: Facts, Functions & Diseases. The urinary system – also known as the renal system – produces, stores and eliminates urine, the fluid waste excreted by the kidneys.
The urinary system includes two kidneys, two ureters, the bladder, two sphincter muscles and the urethra. Description of the urinary system The urinary system works with the lungs, skin and intestines to maintain the balance of chemicals and water in the body. Adults eliminate about a quart and a half (1.42 liters) of urine each day, depending on the amount of fluid consumed and fluid lost through perspiring and breathing. Respiratory System: Facts, Function and Diseases. The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide.
The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe. Red blood cells collect the oxygen from the lungs and carry it to the parts of the body where it is needed, according to the American Lung Association. During the process, the red blood cells collect the carbon dioxide and transport it back to the lungs, where it leaves the body when we exhale. The human body needs oxygen to sustain itself. A decrease in oxygen is known as hypoxia and a complete lack of oxygen is known as anoxia and, according to MedLine Plus. Skeletal System: Facts, Function & Diseases. The adult human skeletal system consists of 206 bones, as well as a network of tendons, ligaments and cartilage that connects them.
The skeletal system performs vital functions — support, movement, protection, blood cell production, calcium storage and endocrine regulation — that enable us to move through our daily lives. Animals with internal skeletons made of bone, called vertebrates, are actually the minority, as 98 percent of all animals are invertebrates, meaning they do not have internal skeletons or backbones. Human infants are born with 300 to 350 bones, some of which fuse together as the body develops. Reproductive System: Facts, Functions and Diseases. The reproductive system is a collection of organs that work together for the purpose of producing a new life.
Scientists argue that the reproductive system is among the most important systems in the entire body. Without the ability to reproduce, a species dies. Lymphatic System: Facts, Functions & Diseases. The primary function of the lymphatic system is to transport lymph, a clear, colorless fluid containing white blood cells that helps rid the body of toxins, waste and other unwanted materials.
Lymphatic comes from the Latin word lymphaticus, meaning "connected to water," as lymph is clear. The lymphatic system, which is a subset of the circulatory system, has a number of functions, including the removal of interstitial fluid, the extracellular fluid that bathes most tissue. It also acts as a highway, transporting white blood cells to and from the lymph nodes into the bones, and antigen-presenting cells to the lymph nodes.
Immune System: Diseases, Disorders & Function. The job of the immune system — which is a collection of structures and processes within the body — is to protect against disease or other potentially damaging foreign bodies.
When functioning properly, the immune system identifies a variety of threats, including viruses, bacteria and parasites, and distinguishes them from the body’s own healthy tissue. The major components of the immune system include: Endocrine System: Facts, Functions and Diseases. The endocrine system is the collection of glands, each of which secretes different types of hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep and mood, among other things. The word endocrine derives from the Greek words "endo," meaning within, and "crinis," meaning secrete.
Description of the endocrine system The endocrine system is made of eight major glands, which are groups of cells that produce and secrete chemicals. A gland selects and removes materials from the blood, processes them, and secretes the finished chemical product for use somewhere in the body. Digestive System: Facts, Function & Diseases. The human digestive system is a series of organs that converts food into essential nutrients that are absorbed into the body and moves the unused waste material out of the body. It is essential to good health because if the digestive system shuts down, the body cannot be nourished or rid itself of waste. Description of the digestive system The digestive tract, also known as the gastrointestinal (GI) tract, starts at the mouth, continues to the esophagus, stomach, small intestine, large intestine (commonly referred to as the colon) and rectum, and ends at the anus. The entire system — from mouth to anus — is about 30 feet (9 meters) long.
CellCraft. CellCraft is a state of the art game that invites students to delve into the world of the cell, learning about how a cell functions while helping it survive in hostile environments. The student will gain an understanding of important molecules such as glucose and ATP, as well as a variety of cellular organelles, while going through an entertaining story guided by Platypus scientists in need of help. The game encourages students to balance resources and grow a robust cell in order to fight off cold, starvation, and viruses. Can you use your cellular knowledge to grow a super cell and save the Platypus species? Find out by mastering the art of CellCraft! Six myths about vaccination – and why they’re wrong. A pear has 600 times more formaldehyde in it than a vaccine does, writes Rachael Dunlop. Image: Oksana Kuzmina/Shutterstock Recently released government figures show levels of childhood vaccination have fallen to dangerously low levels in some areas of Australia, resulting in some corners of the media claiming re-ignition of “the vaccine debate”.
Melting Glaciers Liberate Ancient Microbes. Editor's Note: This article is an extended version of "Bugs in the Ice Sheet" from the May 2012 Issue of Scientific American. BOZEMAN, Mont. —Locked in frozen vaults on Antarctica and Greenland, a lost world of ancient creatures awaits another chance at life. Like a time-capsule from the distant past, the polar ice sheets offer a glimpse of tiny organisms that may have been trapped there longer than modern humans have walked the planet, biding their time until conditions change and set them free again. With that ice melting at an alarming rate, those conditions could soon be at hand. GMO - What Is It? After Life: The Science Of Decay (BBC Documentary) Interactive Tutorials and Quizzes On Human Anatomy and Physiology. Human Anatomy Model, Anatomy Chart, Anatomical Chart.
Interactive 3D Human Anatomy. Home of CELLS alive!