Sunday, 5 November 2017

Muscles..

                          MUSCLES




WHAT are Muscles?

Muscles are soft tissues,which can be described as the 'engine' that our body uses to propel itself. Like any other engine,muscles turn energy into motion. They are long-lasting, self-healing and able to grow stronger with practice. A normal human body has more than 600 muscles. They account for about half of a person's weight.

What do muscles do?


Muscles do everything from allowing us to walk to keeping our blood flowing. It would be impossible for us to do anything without our muscles. Muscles have the ability to contact and expand,and so they can maintain the position of the body parts, as well as facilitate movement of internal organs.


What are muscles made up of?


Muscles are made up of fibre,a type of elastic tissue. Each

bundles is wrapped in a thin skin called the perimysium. The bigger the muscle, the more bundle of fibres it has. Inside the muscles, there are nerves which carry message to and from the brain. Muscle fibre contain filaments of two kinds of protein, actin and myosin, that slide past one another,producing a contraction that changes both the length and shape of the cell.


How many types of muscles does a human body have?

Abdominals

A human body has three different type of muscles: skeletal muscles,attached to the skeleton and come in the pairs,smooth muscles,found in our digestive system,blood vessels, bladder, airway and in a female,the uterus and cardiac muscles,found only in the heart. The skeletal muscles is under voluntary control, and the smooth muscle is under involuntary control. The diaphragm (which control breathing) is an exception to the smooth muscles being under involuntary control,to which a person can exert a limited amount of voluntary control also; for example:purposely holding one's breath or breathing quickly or deeply.