Dominic Stone
Visceral muscle tissue, also known as smooth muscle, is a type of muscle tissue associated with the internal organs of the body, particularly those in the abdominal cavity. Smooth muscle fibres are located in the walls of hollow visceral organs, such as the liver, pancreas and intestines, and are responsible for involuntary movements through their contraction and relaxation. The physiological features of visceral smooth muscle cells, including their receptors and ion channels, play an essential role in maintaining homeostasis in biological systems.
| Characteristics | Values |
|---|---|
| Definition | Visceral muscle tissue, or smooth muscle, is tissue associated with the internal organs of the body, especially those in the abdominal cavity. |
| Types of Muscle Tissue | There are three types of muscle tissue: skeletal, smooth, and cardiac. |
| Involuntary Muscles | The smooth, involuntary muscles of visceral muscle tissue line the blood vessels, stomach, digestive tract, and other internal organs. |
| Composition | Visceral muscles are composed of bundles of specialized cells capable of contraction and relaxation to create movement. |
| Appearance | When sliced diagonally, visceral muscle tissue resembles a telephone cable, with smaller bundles of fibers inside. |
| Function | Visceral smooth muscle cells (VSMC) play a crucial role in maintaining homeostasis in biological systems through their contraction and relaxation cycles. |
| Species Differences | The features of visceral smooth muscle cells differ between species and can vary regionally within a given tissue. |
| Ion Channels | Research has focused on the role of ion channels (Na+, Ca2+, K+, and Cl-) and receptor-operated ion channels in visceral smooth muscle cells. |
| Calcium Regulation | Calcium (Ca2+) mobilization in visceral smooth muscle cells occurs through membrane activation, influx and efflux, release from and uptake into the sarcoplasmic reticulum, and dynamic changes within the cytosol. |
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What You'll Learn
Visceral muscle tissue is smooth muscle
Visceral muscle tissue, or smooth muscle, is a type of muscle tissue associated with the internal organs of the body, especially those in the abdominal cavity. It is one of the three types of muscle tissues in the body, the other two being skeletal and cardiac. Smooth muscle is found in the walls of hollow visceral organs, such as the liver, pancreas, intestines, and blood vessels, and is responsible for their movement and function.
Smooth muscle, including visceral smooth muscle, is composed of bundles of specialized cells capable of contraction and relaxation. These contractions and relaxations are essential for maintaining homeostasis in biological systems. For example, visceral smooth muscle cells regulate calcium concentration in the cytoplasm, which is critical for smooth muscle contractility.
The features of visceral smooth muscle cells can differ by tissue and species, and even within a given tissue, regional differences may exist. For instance, studies have examined the differences in ion channels in vascular smooth muscle tissues compared to other visceral smooth muscles.
Research has also focused on the role of calcium (Ca2+) in visceral smooth muscle cells. Ca2+ mobilization occurs through membrane activation, involving influx and efflux through the surface membrane, release from and uptake into the sarcoplasmic reticulum, and dynamic changes in the cytosol. This movement of Ca2+ is critical for the contractile function of visceral smooth muscle cells.
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Visceral muscles are involuntary
Visceral muscle tissue, also known as smooth muscle, is a type of muscle tissue associated with the internal organs of the body, particularly those in the abdominal cavity. It lines the blood vessels, stomach, digestive tract, and other internal organs. Unlike skeletal muscles, which are attached to the skeleton and under voluntary control, visceral muscles are involuntary.
The three types of muscle tissues in the body are skeletal, smooth, and cardiac. Visceral muscles fall under the category of smooth muscles, which are characterized by their spindle shape and location in the walls of hollow visceral organs. These include the liver, pancreas, and intestines, but notably exclude the heart.
The involuntary nature of visceral muscles means that they function without conscious control. They are composed of specialized cells capable of contraction and relaxation, which creates movement and facilitates various physiological processes. For example, visceral smooth muscle cells play a crucial role in maintaining homeostasis in biological systems through their contraction-relaxation cycle.
The physiological features of visceral smooth muscle cells can vary depending on the tissue and species. Research has focused on understanding the role of calcium and ion channels in these cells. Studies have examined the regulatory systems for cytoplasmic calcium concentration and the movement of calcium ions in smooth muscle cells, which influence their contractility and relaxation.
In summary, visceral muscles are a type of smooth muscle tissue that lines and supports the internal organs. Their involuntary nature means that they function without conscious control, and they play a vital role in maintaining bodily functions and homeostasis.
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Visceral muscles line the stomach, digestive tract and blood vessels
Visceral muscle tissue, also known as smooth muscle, is a type of muscle tissue associated with the internal organs of the body, particularly those in the abdominal cavity. There are three types of muscle tissues in the human body: skeletal, smooth, and cardiac. Unlike skeletal muscles, which are attached to the skeleton and under voluntary control, smooth muscles are involuntary. They are composed of bundles of specialized cells capable of contraction and relaxation to create movement.
Smooth muscles line the walls of hollow visceral organs, including the stomach, digestive tract, blood vessels, liver, pancreas, and intestines. They are responsible for maintaining homeostasis in biological systems through their contraction and relaxation cycles. The features of these cells can vary by tissue and species, and even within a given tissue, regional differences may exist.
Research on visceral smooth muscle cells (VSMC) has focused on understanding their physiological features, particularly their ion channels and receptor-operated ion channels. For example, studies have examined the role of calcium (Ca2+) in VSMC using procedures such as patch-clamp, biochemical measurements, and Ca2+ sensitivity of contractile proteins.
The contractile properties of visceral smooth muscles are regulated by the cytoplasmic calcium concentration. Changes in calcium levels within the cell influence the contraction and relaxation cycles of these muscles, impacting their critical role in maintaining homeostasis.
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Visceral smooth muscle cells (VSMC) maintain homeostasis
Visceral muscle tissue, or smooth muscle, is a type of muscle tissue associated with the internal organs of the body, especially those in the abdominal cavity. Smooth muscle fibres are located in the walls of hollow visceral organs such as the liver, pancreas and intestines.
Visceral smooth muscle cells (VSMC) play an essential role in maintaining homeostasis in biological systems. They do this through changes in their contraction-relaxation cycle. VSMCs are capable of both contraction and secretion. Smooth muscle cell contraction alters several cell properties that are important in aortic wall homeostasis: cell shape, alignment and migration.
The ability of these cells to synthesize, secrete, repair, organize and remodel ECM proteins (collagen, elastin and fibrillin) is vital to wall integrity. Hence, a major function of aortic VSMCs is to regulate medial structure through their synthetic properties, which respond to both cell signalling input and mechanical strain. Through direct interaction with various ECM proteins, these cells can transform mechanical stimuli into cellular (contraction) and extracellular (secretion) responses, remodelling the aorta to meet current physiological demands.
In the brain, VSMCs surround cerebral blood vessels and are considered to be a major determinant of cerebral blood flow. They are especially important in the arteries as they regulate the flow of oxygenated blood from the heart to the organs and tissues, including the brain.
The features of these cells differ markedly by tissue and by species; moreover, there are often regional differences within a given tissue.
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VSMC differ by tissue and species
Visceral muscle tissue, or smooth muscle, is associated with the internal organs of the body, especially those in the abdominal cavity. Smooth muscle fibres are located in the walls of hollow visceral organs such as the liver, pancreas, and intestines.
Visceral smooth muscle cells (VSMCs) play an essential role in maintaining homeostasis in biological systems through changes in their contraction-relaxation cycle. The features of these cells differ by tissue and species, and there are often regional differences within a given tissue.
VSMCs are the most abundant cell in vessels and play important roles in the physiology and pathophysiology of blood vessels. In a healthy adult, VSMCs are quiescent, but after a blood vessel injury, they undergo phenotypic modulation from the contractile phenotype to the synthetic phenotype. This synthetic phenotype is characterised by high activity in migration, proliferation, and proteosynthesis. This behaviour can lead to stenosis or obliteration of the vascular lumen.
The transformation of VSMCs from the contractile to the synthetic phenotype is a highly plastic process regulated by a complex network of factors, including circulating plasma substances, transcription factors, growth factors, inflammatory factors, and non-coding RNAs. This transformation can be beneficial or detrimental, depending on the context. For example, synthetic VSMCs can aggravate aortic aneurysm (AA) by secreting MMPs and inflammatory factors, but they can also thicken the smooth muscle layer to prevent AA rupture.
VSMCs can be obtained from blood vessels, usually from subcutaneous veins, and expanded in vitro for use in vascular tissue engineering. However, during in vitro cultivation, VSMCs lose their differentiation markers, so they need to be re-differentiated through seeding on appropriate scaffolds and mechanical stimulation in dynamic bioreactors.
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Frequently asked questions
Visceral muscles are smooth muscles associated with the internal organs of the body, especially those in the abdominal cavity. They line the blood vessels, stomach, digestive tract, and other internal organs.
There are three types of muscles in the body: skeletal, smooth, and cardiac.
Smooth muscles are involuntary muscles that are located in the walls of hollow visceral organs such as the liver, pancreas, and intestines. They are spindle-shaped and composed of bundles of specialized cells capable of contraction and relaxation.
Skeletal muscles are attached to the skeleton and are under voluntary control. They appear striated, meaning they have a striped appearance.
Cardiac muscle cells are located in the walls of the heart and are under involuntary control. They also appear striated.
