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From Karnataka Open Educational Resources
Organisation of cells animal tissues (view source)
Revision as of 13:36, 12 August 2014
, 13:36, 12 August 2014→Notes for teachers
Muscles present in our limbs can be moved or stopped by our conscious will. Such muscles are called voluntary muscles. These muscles are also called
Muscles present in our limbs can be moved or stopped by our conscious will. Such muscles are called voluntary muscles. These muscles are also called
skeletal muscles as they are mostly attached to bones and help in body movement. Under the microscope, these muscles show alternatelight and dark bands or striations when stained appropriately. As a result, they are also called striated muscles. The cells of this tissue are long, cylindrical, unbranched and
skeletal muscles as they are mostly attached to bones and help in body movement. Under the microscope, these muscles show alternatelight and dark bands or striations when stained appropriately. As a result, they are also called striated muscles. The cells of this tissue are long, cylindrical, unbranched and
multinucleate.These muscles fatigue easily.<br>
multinucleate.These muscles fatigue easily.
[[File:striated_muscle.jpg|300px]]
'''T.S of Striped muscles'''
'''Striped muscles'''
'''Unstriped muscles'''<br>
'''Unstriped muscles'''<br>
Unstriped muscles are made up of spindle shaped, elongated muscle fibres without striations. They are called smooth muscles.The movement of food in the alimentary canal or the contraction and relaxation of blood vessels are involuntary movements. We cannot control these movements on our own will. Smooth muscles or involuntary muscles control such movements. They are also found in the iris of the eye, in ureters and in the bronchi of the lungs.<br>
Unstriped muscles are made up of spindle shaped, elongated muscle fibres without striations. They are called smooth muscles.The movement of food in the alimentary canal or the contraction and relaxation of blood vessels are involuntary movements. We cannot control these movements on our own will. Smooth muscles or involuntary muscles control such movements. They are also found in the iris of the eye, in ureters and in the bronchi of the lungs.<br>
[[File:unstriatedMuscle-smooth.jpg|300px]]
'''Unstriped muscles'''
'''Unstriped muscles'''
The muscles of the heart show rhythmic contraction and relaxation throughout life. These involuntary muscles are called cardiac muscles. Heart muscle cells are cylindrical,elongated, branched and uninucleate. They do not fatigue easily.
The muscles of the heart show rhythmic contraction and relaxation throughout life. These involuntary muscles are called cardiac muscles. Heart muscle cells are cylindrical,elongated, branched and uninucleate. They do not fatigue easily.
[[File:MuscleCardiacCells.gif|300px]]
'''Cardiac muscles'''
'''Cardiac muscles'''
[[File:cardiac_muscle.jpg|400px]]
'''Cardiac muscles'''
'''Cardiac muscles'''
