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Striated muscles are highly organized tissues that convert chemical energy to physical energy. They are responsible for generating force and contracting to support respiration, locomotion, and posture. Striated muscles can be categorized into two types: skeletal muscle and cardiac muscle. Skeletal muscles are attached to the bones and enable a wide range of movements and functions, while cardiac muscles are located in the walls of the heart and help pump blood throughout the body. Skeletal muscles make up a significant portion of our body mass and are under voluntary control, allowing us to consciously decide how and when they work. On the other hand, cardiac muscles are involuntary and function without conscious thought.
| Characteristics | Values |
|---|---|
| Types of striated muscle | Skeletal muscle, cardiac muscle |
| Location of skeletal muscle | Throughout the body, attached to the skeleton |
| Location of cardiac muscle | In the walls of the heart |
| Function of striated muscle | To generate force and contract |
| Function of skeletal muscle | Producing movement, sustaining body posture and position, maintaining body temperature, storing nutrients, stabilizing joints, enabling breathing |
| Function of cardiac muscle | Pumping blood throughout the body |
| Control of skeletal muscle | Voluntary |
| Control of cardiac muscle | Involuntary |
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What You'll Learn
Skeletal muscle
In summary, skeletal muscle is found throughout the body, attached to the bones and allowing for a wide range of movements and functions. It has a distinct microscopic striated appearance due to the arrangement of its myofibrils and plays a crucial role in various bodily functions, including movement, posture, and temperature regulation.
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Cardiac muscle
Striated muscles are highly organized tissues that convert chemical energy to physical work. They are responsible for generating force and contracting to support respiration, locomotion, and posture (skeletal muscle) and to pump blood throughout the body (cardiac muscle).
The individual cardiac muscle cell is a tubular structure composed of chains of myofibrils, which are rod-like units within the cell. The myofibrils consist of repeating sections of sarcomeres, which are the fundamental contractile units of the muscle cells. Sarcomeres are composed of long proteins that organize into thick and thin filaments, called myofilaments. Thin myofilaments contain the protein actin, and thick myofilaments contain the protein myosin. The myofilaments slide past each other as the muscle contracts and relaxes. This process is activated by the release of calcium from the sarcoplasmic reticulum when delivering an action potential to the muscle, in a process called excitation-contraction coupling.
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Smooth muscle
The contractile machinery of smooth muscle is composed of thin filaments, mainly consisting of alpha-actin and gamma-actin, with actin making up a significantly larger proportion than myosin. Unlike striated muscle, smooth muscle does not contain the protein troponin but instead contains significant levels of calmodulin, caldesmon, and calponin. The function of tropomyosin, which blocks actin-myosin interactions in striated muscle, is unknown in smooth muscle. Smooth muscle contractions are relatively slow but can be maintained for longer periods, and they have an extensive range of control.
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Striated muscle functions
Striated muscles are highly organized tissues that convert chemical energy to physical work. They are called striated muscles because they have a "striated" or striped appearance under a microscope due to their densely packed myofibrils. The two types of striated muscle are skeletal muscle and cardiac muscle.
Skeletal Muscle Functions
Skeletal muscle is found throughout the body and is attached to some component of the skeleton. It functions to contract in response to a stimulus, and it serves many purposes, including:
- Producing movement
- Sustaining body posture and position
- Maintaining body temperature
- Storing nutrients
- Stabilizing joints
- Supporting respiration
- Maintaining body temperature
Cardiac Muscle Functions
Cardiac muscle cells are specialized striated muscle cells found only in the heart. Their main function is to contract, which pumps blood throughout the body. They also produce the atrial natriuretic peptide (ANP) in the atria, which stimulates diuresis and lowers blood pressure.
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Striated muscle repair
Skeletal and cardiac muscles are the only striated muscle tissues in the body. They share numerous structural and functional characteristics, but exhibit vastly different regenerative potentials.
Healthy skeletal muscle has a robust regenerative response, but this becomes inadequate after large muscle loss or in degenerative pathologies and aging. The regeneration process involves three phases: the inflammatory response, the activation, differentiation, and fusion of
In contrast, the mammalian heart loses its regenerative capacity shortly after birth, leaving it susceptible to permanent damage by acute injury or chronic disease. However, there have been promising results in animal studies using a variety of scaffold materials, such as natural derivatives (fibrin, alginate, collagen, etc.) and synthetic materials (self-assembling peptides, polymer-based systems, etc.).
For skeletal muscle therapies, improved cell isolation and culture techniques are needed to expand functional stem cells and maintain their myogenic potential in vitro. For cardiac repair, robust methods are required to accelerate in vitro cardiomyocyte maturation and promote transplanted cell survival in vivo.
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Frequently asked questions
Striated muscles are located in the heart, appearing striped under a microscope. They are also found in skeletal muscles, which are attached to the bones and allow movement and function.
There are two types of striated muscles: skeletal muscle and cardiac muscle. Skeletal muscles are voluntary muscles, while cardiac muscles are involuntary.
The primary function of striated muscles is to generate force and contract. Skeletal muscles help with breathing, movement, and posture maintenance, while cardiac muscles pump blood throughout the body.
