Science in Seconds by Hazel Muir

Author:Hazel Muir [Muir, Hazel]
Language: eng
Format: epub, mobi, pdf
Tags: SCIENCE
ISBN: 9781623650070
Publisher: Quercus
Published: 2013-08-11T16:00:00+00:00

Musculoskeletal system

The musculoskeletal system consists of all the bones in the skeleton along with the muscles, tendons, and other connective tissues that support them and allow us to move.

More than two hundred bones in humans form a rigid, protective framework to which softer tissues and organs are attached. The skull protects the brain from damage, for instance, while the sternum and rib cage protect the heart and lungs. Bones are connected to each other by bands of fibrous tissue called ligaments. Some bones, including the femur, contain bone marrow that houses stem cells, which can transform into blood cells in order to increase the body’s blood supply.

Skeletal or “voluntary” muscles are bundles of fibers that contract and relax to move bones and joints. They are mostly attached to bones by collagen fibers called tendons and move in response to voluntary instructions from the brain. Smooth or “involuntary” muscle forms within the walls of organs such as the stomach and intestines, where they push food through the digestive system without any conscious control.

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