Muscle tissue is one of the basic tissue types. Histologically, the muscles of the body can be classified into 3 types: skeletal, smooth, and cardiac. The 3 types of muscle tissue are based on the morphologic and functional properties of the cells. One of the defining characteristics of muscle tissue is its contractility, which generates forces that move the musculoskeletal system as well as cause movement in the vasculature and multiple organ systems. This contractility is due to specialized proteins Proteins Linear polypeptides that are synthesized on ribosomes and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of amino acids determines the shape the polypeptide will take, during protein folding, and the function of the protein. Energy Homeostasis known as myofilaments, which create organized structures that have the ability to lengthen and contract.
Last updated: Apr 18, 2023
Muscle tissue is made up of muscle cells known as myocytes, which is one of the primary tissue types.
There are 3 types of muscle tissue based on morphologic and functional differences:
The muscle is arranged in a hierarchical structure:
The myofibrils are organized in a pattern that creates different bands and zones when viewed under microscopy. These bands are created by overlapping actin Actin Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or f-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or g-actin. In conjunction with myosins, actin is responsible for the contraction and relaxation of muscle. Skeletal Muscle Contraction and myosin Myosin A diverse superfamily of proteins that function as translocating proteins. They share the common characteristics of being able to bind actins and hydrolyze mgATP. Myosins generally consist of heavy chains which are involved in locomotion, and light chains which are involved in regulation. Within the structure of myosin heavy chain are three domains: the head, the neck and the tail. The head region of the heavy chain contains the actin binding domain and mgATPase domain which provides energy for locomotion. The neck region is involved in binding the light-chains. The tail region provides the anchoring point that maintains the position of the heavy chain. The superfamily of myosins is organized into structural classes based upon the type and arrangement of the subunits they contain. Skeletal Muscle Contraction strands.
There are 3 primary types of skeletal muscle fibers, found in different muscles throughout the body based on their function.
Skeletal muscle cell contraction requires stimulation by an action potential Action Potential Abrupt changes in the membrane potential that sweep along the cell membrane of excitable cells in response to excitation stimuli. Membrane Potential from motor Motor Neurons which send impulses peripherally to activate muscles or secretory cells. Nervous System: Histology neurons Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the nervous system. Nervous System: Histology.
There are several different types of organizational patterns based on the arrangement of bundles the muscle fascicles:
Smooth muscle is primarily found in the walls of hollow structures, including:
There are 2 primary types of smooth muscle tissue:
|Type||Location||Striated versus nonstriated||Motor Motor Neurons which send impulses peripherally to activate muscles or secretory cells. Nervous System: Histology end plates||Characteristics of cells||Control|
|Cardiac||Wall of heart||Striated||Absent (connected via intercalated discs)||
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