NCERT Solutions for Class 9 Science Animal Tissue & Muscular Tissue
Animal Tissue & Muscular Tissue
Class 9 Science :- They are made up of the muscle cell. They are elongated and large size, so they are called as muscle fibre. They contain a special protein called contractile protein.
This protein helps in the movement of the body or limbs by contraction and relaxation. They are arranged parallel to each other so that they can work together.
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a) Striated muscle:
They are called as striped or skeletal or voluntary.
The entire muscle show alternate dark and light strips and therefore called stripped muscle.
They are attached to bones and are responsible for body movement, and therefore called skeletal muscles.
These muscles work according to our will, they are called as voluntary muscles.
Striated muscles fibers are long or elongated, unbranched, have many nuclei.Each muscle cell is enclosed in a thin but distinct plasma membrane called sarcolemma.These muscles are present in limbs,face,neck,tongue,pharynx,diaphragm.
It helps in smooth contraction and movement.
b) Smooth muscle
They occur as a bundle or sheets of spindle-shaped cells. They have a single centrally located nucleus in the center of cytoplasm.
Delicate, contractile thread called myofibrils run longitudinally through the cell. They are found in walls of the alimentary canal, internal organs, ducts of glands, stomach, bronchi, iris of eyes.
1)They do not work according to our will, so they are called involuntary muscles. Movement of food in the alimentary canal, opening and closing of tubes are involuntary movement.
2)Help in contraction and relaxation of blood vessels.
c) Cardiac muscle
They are made up of branched, cylindrical and uninucleate cell.
Each cell is surrounded by sarcolemma, has cytoplasm with longitudinal myofibrils, intercellular spaces are filled with loose connective tissue and blood capillaries.
They have stripes or light and dark bands. They occur in the heart.
1)They contract and relax rapidly, rhythmically and tirelessly throughout life.
2)Relaxation and contraction of these muscles help to pump and distribute blood to various body parts.
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Muscular tissue is composed of muscle cells. Muscle cells are specialized cells which have the capability to contract and expand. Due to contraction and expansion, muscles facilitate various kinds of movements in the body. Muscular tissues are of three types:
Find out notes on Nervous tissue, Epithelial tissue, and Merismatic tissue, and for complete course
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