Uploaded byChethan Kumar
Tissues II
The document discusses various types of animal tissues, including epithelial, connective, muscular, and nervous tissues. It highlights the characteristics and functions of different muscle types (striated, smooth, cardiac) and the structure of neurons in the nervous system. Key features such as muscle fiber characteristics, neuron's structure, and the roles of different cells in both muscle and nervous tissues are detailed.
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Tissues II
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- 21. Striated Muscle FibresSmooth Muscle Fibres Cardiac Muscle Fibres They are long cylindrical cells The fibres are elongated and spindle- shaped The cells are small and Cylindrical The fibres have blunt ends The fibres have pointed ends The fibres have broad end They possess striations or alternate light and dark bands Striations or light and dark bands are absent Striations are present but they are fainter than those of striated muscle fibres Intercalated discs and cross connections are absent Intercalated discs and cross connections are absent Intercalated discs and cross connections are present The muscle fibre is multinucleate. Nuclei are oval in outline. They occur peripherally below the sarcolemma Smooth muscle fibre is uninucleate. Nucleus is centrally place, oval or elongated. The cells are uninucleate. Nucleus is oval-rounded. It is centrally placed Striated muscle fibres occur in limbs, hands, feet, body wall, tongue, pharynx and upper part of oesophagus The fibres occur in dermis, urinogenital tracts, digestive tract, lungs, iris, blood vessles, etc The muscle fibres occur only in the wall of heart. They are voluntary They are involuntary They are involuntary They are able to perform fast and powerful contractions but soon get fatigued They perform slow but prolonged contractions without getting fatigued Cardiac muscle fibres perform powerful rhythmic contractions without ever getting fatigued.
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- 23. Human Nervous system CentralNervous System – Brain – Spinal cord
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- 26. Neuron The structural and functionalunit of the nervous system Membrane covering the neuron.- Neurilemma
- 27. Structure of neuron Cellbody contains nucleus and cytoplasm with Nissl’s granules. It has two types of processes- dendrons and axon. Short processes that bring information to the cell body Long process that carry information away from the cell body. Branches of axon with knobs that connect with dendrite of next neuron.
- 29. Neuron, nerve fiber andnerve • Many nerve fibers (axon of neuron) together form a nerve. • Axon of the neuron is called Nerve fiber • Neuron is a nerve cell
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- 33. Cell Body (Cyton,Perikaryon or Soma)
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- 37. Schwann cells formingthe Myelin sheath (PNS)
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