The Skeletal and Muscular Systems (The Human Body, How It Works)

Support, Movement, and Protection
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Want to learn more about the muscles in the human body? Here are five other facts to keep in mind about the muscular system.

Muscular System

The muscles that move the human skeleton vary greatly in shape and size and extend to every part of our bodies. In the muscular system, skeletal muscles are connected to the skeleton, either to bone or to connective tissues such as ligaments. Muscles are always attached at two or more places. When the muscle contracts, the attachment points are pulled closer together; when it relaxes, the attachment points move apart. Muscles contract and relax to move bones.

Bones, Muscles, and Joints

The elbow joint bends flexes when muscles pull on the radius and ulna of the arm. Muscles contract when messages travel from nerves to muscles and trigger chemical reactions. These reactions change the internal structures of muscle fiber cells, a process that shortens the muscle. The muscle fibers relax when the nervous system signal is no longer present, thus reversing the shortening.

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Not all muscle tissue is skeletal muscle. Smooth muscle tissue is in the walls of many human body organs and helps those organs move to facilitate body functions. The alimentary canal esophagus, stomach, and intestines includes muscle tissue that contracts and relaxes to move nutrients through the digestion process.

The muscle groups and their actions

Human Muscular System – The muscles of the human body are Skeletal muscles rarely work by themselves to achieve movements in the. Human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, .

The urinary bladder also includes muscle tissue that contracts and relaxes to hold and release urine. Heartbeats are the result of the contraction and relaxation of muscle tissue in the heart wall.

Smooth muscles in the walls of arteries help move blood through the body. How do skeletal muscles move? It happens when the muscular system and the nervous system work together: Somatic signals are sent from the cerebral cortex to nerves associated with specific skeletal muscles.

A: Functions of the Musculoskeletal System - Biology LibreTexts

Most signals travel through spinal nerves that connect with nerves that innervate skeletal muscles throughout the body. Want to flex an elbow joint?

Bones in the skull are joined like this. Other bones are joined to each other by flexible joints. Muscles are needed to move bones attached by joints. There are different kinds of blood cells, including:.

The Muscular System

These cells are made in the bone marrow. This is soft tissue inside our larger bones which is protected by the hard part of the bone which surrounds it. An introduction to the skeletons of humans and other animals.

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The skeleton Our skeleton is made of more than bones. Function of the skeleton The skeleton has four main functions: to support the body to protect some of the vital organs of the body to help the body move to make blood cells Support The skeleton supports the body. Protection Here are some examples of what the skeleton protects: the skull protects the brain the ribcage protects the heart and lungs the backbone protects the spinal cord An X-ray image of the chest.