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The muscular system is primarily responsible for providing the body with movement. The human body has over 600 muscles, which are categorised into three types: cardiac, visceral or smooth, and skeletal. The cardiac muscle is an involuntary muscle, operating without conscious control, while skeletal muscles are considered voluntary as they require a conscious effort to move. The muscular system has five major properties: being excitable or irritable, contractible, extensible, elastic, and adaptable. Muscles are considered excitable or irritable because they can receive stimulation from nerves and respond to it. This stimulation can be external and chemical or electrical.
| Characteristics | Values |
|---|---|
| Excitable or Irritable | Muscles are excitable or irritable as they can receive stimulation from nerves and respond to it. |
| Contractible | Muscles can contract or shorten after receiving stimulation. |
| Extensible | Muscles can be stretched without damage by the application of force. |
| Elasticity | Muscles can return to their original resting shape and length after being extended or contracted. |
| Adaptability | Muscles can change in response to how they are used. For example, they can enlarge with increased work or waste away if deprived of work. |
| Types of Movement | Abduction, adduction, flexion, extension, and rotation. |
| Types of Muscle | Cardiac, Visceral or smooth, and Skeletal. |
| Control | Cardiac and Visceral muscles are involuntary, whereas Skeletal muscles are voluntary. |
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What You'll Learn
- Muscles are excitable tissue that can carry an action potential due to external stimuli
- The nervous system is connected to the muscular system, allowing muscles to receive stimulation
- Muscle excitability can be measured through semiquantitative analysis, which is typically reduced in fibroses
- Muscle hypertrophy can be caused by continuous muscle activity, leading to muscle enlargement
- Muscle contractibility allows muscles to shorten with force, lengthen passively, and move
Muscles are excitable tissue that can carry an action potential due to external stimuli
The muscular system is primarily responsible for providing movement to the body. It is made up of over 600 muscles, which are categorised into three main types: skeletal, cardiac, and visceral or smooth muscles. Skeletal muscles are attached to the skeleton and are responsible for voluntary movements, requiring conscious effort or decisions to move. On the other hand, cardiac and visceral muscles are involuntary and operate without conscious control.
Muscles are considered excitable or irritable tissue, capable of receiving stimulation from the nervous system and responding accordingly. This excitability refers to the ability of muscle fibres to carry an action potential due to external chemical or electrical stimuli. The nervous system is intrinsically connected to the muscular system, and this communication is vital for movement. If the connection between the nervous system and skeletal muscles is severed, the body enters a state of paralysis, known as quadriplegia.
The excitability of muscles can be evaluated through various techniques, such as single-fiber EMG (SFEMG) electrodes and DMS with recording potentials distal to the endplate zone. These methods help determine muscle excitability and distinguish between different muscle conditions or abnormalities. For example, reduced insertional activity may indicate functional inexcitability of muscle fibres during attacks of familial periodic paralysis. On the other hand, an irritable muscle may exhibit abnormally prolonged insertional activity, as seen in denervation, myotonic disorders, or myositis.
Additionally, muscle excitability can be assessed by measuring the Motor Threshold (MT), which is the stimulation intensity that elicits muscle contraction or Motor Evoked Potentials (MEPs). This can be measured as "resting" MT (rMT) or "active" MT (aMT), with aMT generally having a lower threshold due to moderate isometric contraction of target muscles. These evaluations provide important insights into muscle function and any potential abnormalities or conditions affecting muscle excitability.
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The nervous system is connected to the muscular system, allowing muscles to receive stimulation
The muscular system is primarily responsible for providing movement to the body. The nervous system, on the other hand, is the body's command centre, regulating functions like thoughts, memory, movement, balance, coordination, and even unconscious processes like digestion, blushing, sweating, and blinking.
The number of muscle fibres innervated by a motor neuron varies depending on the task required for a specific movement. For instance, muscles involved in precision tasks like controlling eye movement may have one muscle fibre per motor neuron, while larger muscles like the quadriceps may have hundreds of muscle fibres per motor neuron. Muscle activation occurs through chemical transmission, with substances like calcium initiating muscle contraction.
The nervous system's role in muscle movement is particularly evident when communication between the two systems is disrupted. If the nervous system's connection to the skeletal muscles is severed, the muscles lose their ability to produce movement, resulting in paralysis, known as quadriplegia.
In summary, the nervous system's connection to the muscular system enables muscles to receive stimulation and contract, facilitating the body's movements. The intricate interplay between these systems ensures that our actions are precise and coordinated.
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Muscle excitability can be measured through semiquantitative analysis, which is typically reduced in fibroses
The muscular system is primarily responsible for providing the body with movement. Muscles are excitable or irritable, meaning they can receive stimulation from nerves and respond to it. They are also contractible, extensible, elastic, and adaptable.
Muscle excitability can be measured through semiquantitative analysis, which involves inserting a needle electrode into a muscle and recording the electrical discharges that follow. The magnitude of the response depends on the speed and extent of the needle movement. This analysis provides an important measure of muscle excitability, which is typically reduced in fibroses and exaggerated in denervated or inflammatory muscles.
Reduced insertional activity may indicate functional inexcitability of muscle fibres, as seen in attacks of familial periodic paralysis. In contrast, an irritable muscle may show abnormally prolonged insertional activity, as observed in denervation, myotonic disorders, or myositis.
To further assess muscle fibre excitability, various electrodes, such as surface, subdermal, and conventional concentric and monopolar needle electrodes, can be employed. The ratio of the nerve-evoked (nCMAP) response amplitude to the muscle-evoked (mCMAP) response amplitude can be calculated to evaluate impaired muscle membrane excitability. Additionally, evoked response amplitude and muscle fibre conduction velocity are measured to assess excitability.
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Muscle hypertrophy can be caused by continuous muscle activity, leading to muscle enlargement
Muscles are excitable or irritable, meaning they can receive stimulation from nerves and respond to it. This stimulation results in muscle contraction, and the muscles' ability to shorten or lengthen. The muscular system is adaptable, and can change in response to how it is used. For example, muscles can enlarge or undergo hypertrophy with increased work.
Muscle hypertrophy refers to an increase in muscle mass, size, and strength. It is caused by strength training, such as weightlifting, which involves training against resistance that gradually increases over time. This type of training causes mechanical damage and metabolic fatigue in the muscles, which stimulates a repair response in the body, resulting in an increase in muscle size.
To achieve muscle hypertrophy, it is important to continuously challenge the muscles and create a stimulus for them to adapt and grow. This can be done through a variety of exercises, including short-duration, high-intensity anaerobic exercises. It is also important to have a protein-rich diet, focusing on lean protein sources, to support muscle growth.
In addition to strength training, muscle hypertrophy can also be caused by continuous muscle activity. For example, non-dystrophic myotonia is a rare neurological condition characterized by delayed relaxation after muscle contraction, leading to muscle stiffness and hypertrophy. This condition is caused by mutations in the voltage-gated chloride channel ClC-1, resulting in exacerbated sarcolemma excitability.
Therefore, muscle hypertrophy can indeed be caused by continuous muscle activity, leading to muscle enlargement. This can occur through strength training, continuous muscle stimulation, or as a result of certain medical conditions.
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Muscle contractibility allows muscles to shorten with force, lengthen passively, and move
The muscular system is primarily responsible for providing the body with movement. The muscles receive their ability to move the body through the nervous system. The nervous system is intrinsically connected to the muscular system of the body. If the communication from the nervous system is severed from the skeletal muscles, the skeletal muscles will not be able to produce movement for the body, resulting in paralysis.
Muscles are excitable or irritable, meaning they are capable of receiving stimulation from the nerves and responding to it. Muscle contractibility is one of the five major properties of the muscular system. It allows muscles to shorten with force, lengthen passively, and move.
Muscle contraction is the tightening, shortening, or lengthening of muscles when an individual engages in some activity. It can occur when an individual holds or picks up something, or when they stretch or exercise with weights. Muscle contraction is often followed by muscle relaxation, which is the return of muscle fibres to a low-tension state. The physiological concept of muscle contraction is based on two variables: length and tension. Tension within a muscle can be produced without any changes in its length, such as when holding a dumbbell in the same position.
There are three types of muscle contractions: isometric, concentric, and eccentric. Isometric contraction occurs when a muscle is held at a set length. For example, carrying something in your arms involves keeping your arms at a steady position without raising or lowering the object. Concentric contraction occurs when there is sufficient muscle tension to overcome the load, resulting in the muscle contracting and shortening. This can be observed during a bicep curl or when standing up from a squatting position. Eccentric contraction occurs when the muscle works to decelerate a joint at the end of a movement, such as when walking or lowering a heavy object.
The force-velocity relationship in muscle contraction refers to the velocity of muscle shortening as a function of afterload, which is the force against which the muscle contracts. As the afterload increases, the shortening velocity decreases, and maximal velocity is achieved when there is zero afterload on the muscle.
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Frequently asked questions
Muscles are considered excitable or irritable. This means that they are capable of receiving stimulation from the nerves and responding to it.
There are 5 types of muscle movements: adduction, abduction, flexion, extension, and rotation. Adduction is the movement of a body part toward the mid-line of the body, while abduction is the opposite, moving a body part away from the body. Flexion is the bending of a joint to decrease the angle between two bones or body parts, and extension is straightening the joint to increase the angle. Rotation involves moving a body part around an axis.
The 3 main types of muscles are skeletal, cardiac, and visceral or smooth muscles. Skeletal muscles are voluntary, meaning they require a conscious effort to move. Cardiac muscles are involuntary and operate without conscious control. Visceral or smooth muscles are also involuntary and are found in organs such as the digestive and respiratory systems.
If the connection between the nervous system and skeletal muscles is lost, the skeletal muscles will be unable to produce movement, resulting in a state of paralysis known as quadriplegia.
