The Muscular System
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Basics
The Muscular System
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Function:
The main function of the muscular system is to move your body. Muscles do this by contracting and moving your bones. Examples of body movement caused by the muscular system might include moving your legs while you walk or even contracting a small blood vessel in your head.Organs:
There are 3 kinds of muscles and organs in the muscular system: skeletal, cardiac, and smooth muscles.
SKELETAL: Skeletal muscles are strong voluntary meaning you can control them and decide whether or not to move them. These are the muscles that allow you to move. They are attached to bones via tendons. When you contract and relax these muscles, your bones will move, moving you. Some skeletal muscles include your abs, biceps, and calves.
CARDIAC: Cardiac muscles are involuntary, meaning you can't control them. Instead, they are controlled by something called the autonomic nervous system. They can only be found in your heart. In fact, your heart is almost entirely made of cardiac tissue. Cardiac muscles are responsible for pumping blood throughout your whole body.
SMOOTH: Smooth muscles are usually involuntary. Smooth muscles push food along the digestive track and control the flow of blood through blood vessels. Most of the digestive system's organs are made of smooth muscular tissue. They can be found in organs such as your bladder, intestines, stomach, diaphragm, veins, and arteries.
Interactions With Other Systems
The muscular system mainly works with two other systems: the nervous, digestive, and circulatory.
There are 3 kinds of muscles and organs in the muscular system: skeletal, cardiac, and smooth muscles.
SKELETAL: Skeletal muscles are strong voluntary meaning you can control them and decide whether or not to move them. These are the muscles that allow you to move. They are attached to bones via tendons. When you contract and relax these muscles, your bones will move, moving you. Some skeletal muscles include your abs, biceps, and calves.
CARDIAC: Cardiac muscles are involuntary, meaning you can't control them. Instead, they are controlled by something called the autonomic nervous system. They can only be found in your heart. In fact, your heart is almost entirely made of cardiac tissue. Cardiac muscles are responsible for pumping blood throughout your whole body.
SMOOTH: Smooth muscles are usually involuntary. Smooth muscles push food along the digestive track and control the flow of blood through blood vessels. Most of the digestive system's organs are made of smooth muscular tissue. They can be found in organs such as your bladder, intestines, stomach, diaphragm, veins, and arteries.
Interactions With Other Systems
The muscular system mainly works with two other systems: the nervous, digestive, and circulatory.
Nervous System
The connection between the muscular and nervous system is pretty obvious. Before you move or do anything, you have to think. Skeletal muscles contract in response to signals from the nervous system. Involuntary muscles like the smooth and cardiac are controlled by the automatic nervous system.Digestive and Circulatory System
Now, let's talk about how the muscular system works and interacts with the digestive and circulatory. For one, smooth muscles make up most o the organs in the digestive system anyway. They push food along the digestive track. Smooth muscles also control the flow of blood through blood vessels that are a part of the circulatory system. In addition to that, the heart, an organ of the circulatory system, is also almost entirely made of cardiac tissue.
Analogy: Skeletal Muscles Are Like Car Pistons
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Skeletal muscles are like car pistons because:
- when the pistons move up and down like how the skeletal muscles contract and relax, the wheels of a car start moving like how your bones would. Moving the wheels (or bones) moves the whole car (or organism).
- pistons are also voluntary. they only start moving up and down when the driver presses the gas button. Skeletal muscles only contract and relax when you tell them to.
How pistons move up and down is quite similar to the movements of your skeletal muscles. If the pistons were the skeletal muscles, then the muscular system would be the entire engine since both things move the car and organism.
Structure and Function: Skeletal Muscles
Skeletal muscles move your bones which move you. However, in order to prevent regular muscle tearing and so on, it needs to have a few specific traits.
- For one, muscles are slightly stretchy. Their ability to stretch is based upon the flexibility of the muscle. Whenever you do exercises like running, you are stretching out your muscles. If you stretch it out too much, however, you can get an injury. Your muscles need to slightly stretchy for you to be able to really move.
- The size of the muscles also allow it to do it's function. For example, your muscles grow in accordance to your bones. Imagine if your you quadriceps muscles were extremely small and attacked to your long femur bone. How would you move? Your skeletal muscles (and all your muscles really) need to be appropriately sized to be able to function properly.
As you can see, in order to smoothly function, skeletal muscles need to be slightly stretchy as well as appropriately sized.
Sources:
Now, let's talk about how the muscular system works and interacts with the digestive and circulatory. For one, smooth muscles make up most o the organs in the digestive system anyway. They push food along the digestive track. Smooth muscles also control the flow of blood through blood vessels that are a part of the circulatory system. In addition to that, the heart, an organ of the circulatory system, is also almost entirely made of cardiac tissue.
Analogy: Skeletal Muscles Are Like Car Pistons
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| https://upload.wikimedia.org/wikipedia/commons/5/51/Internal_ combustion_engine_pistons_of_partial_cross-sectional_view.jpg |
Skeletal muscles are like car pistons because:
- when the pistons move up and down like how the skeletal muscles contract and relax, the wheels of a car start moving like how your bones would. Moving the wheels (or bones) moves the whole car (or organism).
- pistons are also voluntary. they only start moving up and down when the driver presses the gas button. Skeletal muscles only contract and relax when you tell them to.
Structure and Function: Skeletal Muscles
Skeletal muscles move your bones which move you. However, in order to prevent regular muscle tearing and so on, it needs to have a few specific traits.
- For one, muscles are slightly stretchy. Their ability to stretch is based upon the flexibility of the muscle. Whenever you do exercises like running, you are stretching out your muscles. If you stretch it out too much, however, you can get an injury. Your muscles need to slightly stretchy for you to be able to really move.
- The size of the muscles also allow it to do it's function. For example, your muscles grow in accordance to your bones. Imagine if your you quadriceps muscles were extremely small and attacked to your long femur bone. How would you move? Your skeletal muscles (and all your muscles really) need to be appropriately sized to be able to function properly.
As you can see, in order to smoothly function, skeletal muscles need to be slightly stretchy as well as appropriately sized.
Sources:
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