human body videos: system

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Tuesday, March 17, 2015

MUSCULAR SYSTEM

The skeleton is covered by layers of skeletal muscle. Each muscle is attached to two or more bones so that when the muscle contracts (shortens) it produces MOVEMENT. Skeletal muscle makes up about 40 per cent of body weight. As well as producing movement, some muscles remain partially contracted for long periods to maintain the body’s posture.

MUSCLE STRUCTURE

A skeletal muscle contains many long fibres arranged in bundles called fascicles. Each fibre consists of smaller strands, called myofibrils. These contain yet smaller parts called myofilaments. A muscle contracts when sets of these myofilaments slide past each other in response to nerve signals.

MUSCLES OF THE BODY

There are more than 600 muscles in the body. Their sizes vary from tiny, such as the muscles that move the eyeballs in their sockets, to very large, such as some muscles in the thighs. They are arranged in layers; shown here are the superficial (outer) muscles at the front of the body and, on this side, some of the deeper muscles.

SKELETAL MUSCLE

Skeletal muscle is also called striated or striped muscle. The stripes, which can be seen clearly when a piece of muscle is viewed under a microscope, are caused by the arrangement of myofilaments in individual muscle fibres. These lead to the appearance of alternating light and dark bands.

MOVEMENT

Skeletal muscles cross joints and are attached to the bones on either side by tough cords called tendons. They contract, to produce movement, as a result of nerve signals sent from the brain and spinal cord. Although our movements are under our conscious control, the brain can learn patterns of movements so that we can perform certain tasks, such as walking, without thinking.

MUSCLE ACTION IN MOVEMENT

To straighten the knee, one group of muscles at the front of the thigh contracts, while other muscles at the back of the leg relax. Two groups of muscles such as this are called opposing groups. Contractions of opposing groups have opposite effects, such as knee straightening and bending.

NEUROMUSCULAR JUNCTION

To bring about a movement, the brain sends a series of signals instructing specific muscles to contract, via a network of nerve cell fibres. Each individual fibre divides into several branches before it reaches the muscle, and each branch connects to a single muscle fibre. The region where the nerve and muscle fibres meet is called a neuromuscular junction.

OTHER MUSCLE TYPES

Skeletal muscle is not the only type of muscle in the body. There are two other types: smooth muscle and cardiac (heart) muscle. Unlike skeletal muscle, these muscles are not under our conscious control.

SMOOTH MUSCLE

Smooth muscle is found in the walls of many organs, such as the bladder, the womb, and the intestines, where it contracts to propel food along. It has short, spindle-shaped fibres.

CARDIAC MUSCLE

Cardiac muscle contracts tirelessly throughout life to pump blood from the heart to the lungs and around the body. It is made up of a network of branching muscle fibres.

Urinary System Embryology

Human Digestive System For Kids

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grey trachea,” or while touring the digestive system, she might tell you to “Notice the balloon-like structure of the stomach.” But dont just trust my opinion when I say that My Incredible Body is an exceptional app for teaching children about the Pavlov was awarded the Nobel Prize for his close study of the workings of the digestive system, primarily in dogs and a scientific understanding of the human psyche, would be the key to the social and moral progress that his beloved Russia so It’s bad enough when you hear about children were in the digestive system. The boy’s father showed authorities the upsetting evidence to prove the pig killed his son. Typically sows aren’t the ones known to attack and kill a human being A Boynton Beach museum is using hands-on projects to teach children human anatomy. A pellet, which an owl ejects through its mouth, can contain bones, fur and feathers that it could not digest, Kelley said. "Its a whole different digestive system “The human microbiome is all the microbes that normally live inside the human digestive system," said Keith Sultan, MD, an assistant professor at Hofstra North Shore-LIJ School of Medicine and a gastroenterologist at North Shore University Hospital in The Human Body, by Tinybop, is a charming app that teaches kids how their bodies work through the power Shove an ice cream cone into your avatar’s mouth and you can see how your digestive system turns it into mush. You can explore how hearing works .

In the April issue of Mayo Clinic Proceedings, researchers from Mayo Clinic Arizona and Arizona State University examine the role that bacteria in the human gastrointestinal Another study cited followed children from birth to age 7 and analyzed stool What it all amounts to is a circuitous, engrossing tour through the human body–one that After an hour of play, however, kids were regularly able to give a more sophisticated picture. “Suddenly you had digestive systems that were tubes that Their first app, The Human Body, allows kids to learn explore the nervous, skeletal, respiratory, circulatory, digestive and muscular systems of the human body in self-guided exploration. Setting up a profile is simple; users choose a girl or boy The human digestive tract contains about 400 to 500 types of bacteria that aid in creating a healthy digestive system by helping to digest food and make vitamins. Some of these bacteria also are believed to help the immune system. Some researchers believe .

Another Picture of Human Digestive System For Kids :

Human Body Systems

Digestive System to label

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