The Muscular System

The Muscular System

The muscular system moves the body.
The body has over 600 muscles.

Muscle: an organ that relaxes and contracts to allow movement.

Function of Muscles

The two main functions of muscle are
1. to produce movement
2. to maintain

   The muscular system also helps the body
3. generate heat

Types of muscles.

Skeletal muscles are involved in bodily locomotion.
Smooth muscles are involved in digestion
Cardiac muscles are involved within the heart.

Over all, the muscles are always involved in moving something.

Muscle Movements
Involuntary - Automatically move without you knowing.
Voluntary- Brain sends message to muscle.  You control the movements
Skeletal muscles involve moving the body. They are voluntary muscles.
Cardiac muscles involve moving blood. They are involuntary muscles.
Smooth muscles are involved with moving material in the bowels. They are involuntary muscles.
The Muscular System works with the Skeletal System
to form the
Musculoskeletal System.

These muscles have distinctive attributes.
Skeletal muscles are attached to bone with tendons. They are striated, they apear to have layers.
Smooth muscles act together with other smooth muscles to coordinate the movement of stuff through the bowels. Smooth muscles are not striated, they are thin and line various organs.

Cardiac muscles are in the heart, The heart is an organ that is made of smooth muscle tissue specifically cardiac muscle tissue.

Muscle tissue is a specialized tissue that can contract.

Tendons and Ligaments (Connective Tissue)

As fascinating as they are, muscles alone can't do the job. At every joint, tendons and ligaments also help out. Muscles wouldn't be very useful alone because they don't directly connect to the bone, so even if they contract, they wouldn't be moving anything. Instead, muscles are connected to tendons, when themselves are connected to the bones. When the muscles contract, they pull on the tendons, which in turn pull on the muscles, and that causes movement.

But without ligaments, that movement wouldn't be too useful because it would not be directed movement. Without ligaments, instead of bones bending or rotating about each other when muscles contract, they would slide by each other. Ligaments are what hold the bones together.

When tendons and ligaments are pulled beyond their normal range, a sprain occurs.

Tendons connect muscle to bone.
Ligaments connect bone to bone.

Cartilage acts as a shock absorber between bones.

Cartilage is a flexible connective tissue found in many areas in the bodies of humans and other animals, including the joints between bones, the rib cage, the ear, the nose, the bronchial tubes and the intervertebral discs. It is not as hard and rigid as bone but is stiffer and less flexible than muscle.

Energy changes when your muscles contract...

Eating food supplies your cells with the neccessary nutrients to perform and create ATP or energy.

This is a chemical reaction, turning food into energy...(remember cellular respiration?)

The muscles then use the energy or ATP to move, this is mechanical energy

Also the muscles create HEAT when they move ....This is thermal energy

The muscular system contributes to approximately 40%
of the body’s overall weight (an average sized individual.)
Myology is the study of muscles

How do the muscles help your body maintain its temperature?
Muscles play a significant role in the body’s ability to maintain a constant temperature regardless of the temperature which surrounds it. Metabolism, which is the process of turning food into energy, releases heat, which in turn helps to maintain a regulated body temperature. Muscles, which comprise approximately 40% of the body’s weight, carry enough impact on the human body based solely on their mass to be the prime source of the body’s ability to heat itself and maintain a steady constant temperature. The state of chronic muscle fiber activity maintains body temperature and the state of strenuous muscular activity increases body temperature, encouraging the human body to produce sweat to cool the temperature.

Learn More about Muscles Here

Muscles, Muscles, More


Human Body Systems Study


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