What is the Muscular Tissue?
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Muscular Tissue
The muscle tissue consists of elongated and contractile
cells called muscle cells or myocytes.
Due to their elongated nature, the muscle cells are also
called muscle fibres. It develops from mesoderm. The muscle
cells are surrounded by connective tissue. Each muscle cell
is covered by a membranous sheath called sarcolemma.
It consists of plasma membrane and basement membrane.
The cytoplasm of a myocyte is called sarcoplasm. The
endoplasmic reticulum is called sarcoplasmic reticulum
and the mitochondria are called sarcosomes.
The myoglobin keeps the reserve oxygen for immediate
supply during muscle activity.
It also provides light pinkish colour to the muscles. The
muscle cells may be uninucleate or multinucleate. The
contractile structures of muscle cells are called myofibrils
The myofibrils are made of myofilaments. The
myofilaments are of two types, i.e., thicker myosin and
thinner actin. The contraction of muscles in response to
stimulation occurs due to sliding of actin filaments passing
over the myosin filaments. Contracted muscle fibres
and return to their uncontracted state in a cordinated fashion.