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it is the stiffness of death. The rigidity of a body after death. The temporary rigidity of muscles occurring after death.

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The cardiac action potential is a brief change in voltage (membrane potential) across the cell membrane of heart cells.

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It is when the muscle are stretched, they recoil to their original resting length.

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It is when the muscles can be stretched to their normal resting length and beyond to a limited degree.

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It is the ability of muscle tissue to contract when its thick and thin (actin) filaments slide past each other.

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It is the explanation for how muscles contract to produce force.

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1. The muscular system creates movement. The primary function of muscular system is to produce voluntary gross and fine movements.
2. It protects the organs.
3. The cardiac muscle pumps blood.
4. Smooth muscle aids digestion.
5. Smooth muscle ensures blood flow.

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Function of the Muscular System

Ahh the muscular system; it probably seems overwhelming at first, what with all those funky scientific names. There are over 600 skeletal muscles, and that number doesn't even include the smooth muscles! But, like everything else in your body, the muscular system has its own sense of organization. Once you learn a little bit about how it works, it may begin to make a little more sense to you.

Even the naming system is organized. Some muscles are named for their location, while others are named for their shape or the direction in which their fibers run. We won't get into all those names in this lesson, but we will get started with some of the basics. As you have probably guessed, the main function of the muscular system is movement, but it also helps stabilize our joints, maintain our posture and generate heat during activity.

Movement of our body can be voluntary and controlled by the skeletal muscles, or it can be involuntary and controlled by smooth muscles. Those are found mostly in your internal organs and aid in things like digestion and even eyesight. Skeletal muscles, on the other hand, are what make up what we see a human body do. They move all the different parts of the skeleton. They help us in all kinds of movements, such as walking, swimming, writing and even talking. All this movement is aided by the anatomy and organization of the muscular system. But, before we move on, we should mention you do have one other type of muscle in your body. Cardiac muscles are found in the heart and are responsible for the movement of blood through your body.

Muscle Anatomy

First, let's take a brief look at the muscles themselves. Like so many other things, muscles are made up of lots of smaller parts. We'll start at the level of the muscle fiber. A muscle fiber is simply a muscle cell, or the building blocks of muscles. See, just like the rest of your body is made up of lots and lots of individual cells, your muscles are also made up of cells.

Multiple fibers join together to make up our next level of organization, the fascicle. A fascicle is a group, or bundle, of muscle fibers. And, just like many muscle fibers join together to form a fascicle, many fascicles join together to make up a muscle.

Muscles are made up of groups of fascicles. When stimulated, they contract to produce motion. Without muscles, your body wouldn't be able to function. No more running, talking, walking and, well, you get the picture!

The organization of the muscle allows all the fibers, and thus the fascicles, to contract and relax as a group. Contraction is stimulated by nerve impulses and triggers the movement of the muscle, while relaxation occurs when the impulse is removed and the muscle relaxes back to its natural state. This pattern of contraction and relaxation is responsible for all the movements in your body.

The part of your body that moves in response to a muscle contraction depends on the location and origin point of the muscles themselves. To simplify things, we are going to focus on the skeletal muscles of the body. Most skeletal muscles are attached to bone, cartilage or connective tissue, which limits or directs their movement. For example, a muscle attached to the arm bone will only move the arm bone when stimulated. It cannot move the leg bone; therefore, its movement is determined by its points of attachment.

Origin and Insertion Points

Each muscle has two main points of attachment, the origin point and the insertion point. The origin of a muscle is the fixed end, the end that doesn't move. This end is usually a bone, cartilage or connective tissue. The opposite end of the muscle is the insertion point. This is the movable end of the muscle which is attached to the structure that is being moved.

Let's go back to our arm muscle example. If we take a look at the upper arm bone, called the humerus, we can see a large muscle on top of it. This muscle, called the biceps brachii has a point of origin at the scapula, and its insertion point on the radius of the lower arm. When the muscle contracts, it moves the radius upwards towards the scapula, but the scapula and upper arm do not move. That is why the radius is termed the insertion point, while the scapula is the origin point.

If you're still a little confused about how to tell the difference, you can give it a try on your own. When you move your arm or your leg, take notice of which end of the muscle is doing the moving and which end is staying still. That will help you figure out which is the insertion (that's the one doing the moving) and which is the origin.

Agonists and Antagonists

When a muscle moves, it's because it is stimulated to contract by the nervous system, but what happens after that? How does it return to its starting position? To do that, it needs the help of another muscle, which pulls it back.

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what is the muscular system? - function & how muscles work in groups - video & lesson transcript | study.com

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What Is the Muscular System? - Function & How Muscles Work in Groups - Video & Lesson Transcript | Study.com

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Ahh the muscular system; it probably seems overwhelming at first, what with all those funky scientific names. There are over 600 skeletal muscles, and that number doesn't even include the smooth muscles! But, like everything else in your body, the muscular system has its own sense of organization.

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It is attached to bones by tendons, and they produce the movements of body parts. It is under voluntary control.

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It is an involuntary, muscle that is found in the walls and heart, specifically the myocardium.

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It is the muscle tissue in which the fibrils are not ordered, occurring in the gut and other internal organs and not under voluntary control.

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The brain signals the muscle to contract, and then the body pulls calcium from the blood into the muscle cells. The calcium binds with the troponin and draws it out of position

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A protein found in muscle tissue as a thick filament made up of an aggregate of similar proteins. Myosin and he protein actin form the contractile of skeletal muscle.

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It is protein that forms the microfilaments of the eukaryotic cytoskeleton and plays an important role in cell movement, shape, and internal organization. In muscle cells, it functions with myosin to produce contractions.

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It is a seizure that is a medical sign consisting of the involuntary contraction of muscles, which may be caused by disease that increases the action potential frequency of muscle cells or the nerves that innervate them

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it is often fatal infectious disease that is caused by the bacteria, which usually enters the body through a puncture, a cut, or an open wound./

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You lose conscious of what is going on and your body also begins spasm uncontrollably. Convulsions happen and muscle spams.

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When the body becomes entirely rigid, which follows to uncontrollable body jerking. The muscles begin to spasm uncontrollably and it can keep going up to 5 minutes.

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It is an involuntary movement in your muscles which causes your muscles to contract.

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Is the decline in the ability of the muscle to sustain the strength of contractions. You are not able to generate force.

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It is a thin sheath of fibrous tissue closing a muscle or other organ. The thin band attaches, stabilizes, and separates muscles and all other organs.

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Is a flexible but elastic cord that is made up of strong fibrous tissue connecting the muscle to the bone. It is located all over your body and any muscle needed to connect the together.