Muscular tissue Mrs. Dalia Kamal Eldien MSC in Microbiology Lecture NO 7.
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Transcript of Muscular tissue Mrs. Dalia Kamal Eldien MSC in Microbiology Lecture NO 7.
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Muscular tissue
Mrs. Dalia Kamal Eldien
MSC in Microbiology Lecture NO 7
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Objectives
Function of musclesProperties of MuscleClassification of muscles Types of muscles
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INTRODUCTIONMuscular tissue makes the main bulk of the body.
Functions of Muscles1. Movement(but can only pull)
2. Production of heat
3. Protect the bones and internal organs
MUSCULAR TISSUE
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1- ContractilityAbility of a muscle to shorten or contract with force.
2- ExcitabilityAbility to stretch in response to a force
3- ElasticityAbility of muscle to recoil to original resting length after stretched
Properties of Muscle
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MUSCULAR TISSUE
IFUNCTIONALLY
1. Voluntary-can be moved by will( skeletal muscle)
2. Involuntary- cannot be moved by will (cardiac and smooth muscles)
HISTOLOGICALLY
1. Striated --have striations (skeletal, cardiac muscles)
2. Non striated—no striations (smooth muscles)
Muscles can be classified in two ways
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Functional
classification
Voluntary
(skeletal muscles)
Involuntary
(cardiac and smooth muscles)
Histological classification
Striated muscles
(cardiac and skeletal)
Non-striated muscles
(smooth muscles)
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Due to its high degree of specialization, unique terms are used for certain structures in muscle cells:
1.Individual muscle is called muscle fibers. are the
functional units of the tissue
2. The cytoplasm of muscle fibers is called sarcoplasm.
3.The muscle fiber plasma membrane is called the
sarcolemma.
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4.The smooth endoplasmic reticulum is called the
sarcoplasmic reticulum.
5. The functional unit of a muscle tissue consist of
protein filaments called myofilaments which consists
of thin filaments, actin and thick filaments, myosin.
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MUSCULAR TISSUE
TYPES OF MUSCLES
1. Cardiac muscle
( striated, involuntary)
2. Skeletal muscle
(striated, voluntary)
3. Smooth muscle
(non striated, involuntary)
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MUSCULAR TISSUE
1. SKELETAL MUSCLES• Under microscope
– Long, cylindrical cells – Multinucleate (nucleus on periphery)– Obvious striations
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MUSCULAR TISSUE
• Function – Voluntary movement– Facial expression
• Location– Skeletal muscles attached to bones (occasionally
to skin)– 40% of body weight
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MUSCULAR TISSUE
Each skeletal muscle consists of two kinds of tissue Connective tissue , and Muscle tissue.
The 3 LAYERS OF CONNECTIVE TISSUES IN SKELETAL MUSCLE :
1. Epimysium-Exterior collagen layer• Separates muscle from surrounding tissue
2. Perimysium- Surrounds muscle fiber bundles (fascicles)
• Contains blood vessel and nerve supply to fascicles
3. Endomysium surrounds each single muscle fiber.
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MUSCULAR TISSUE
Level4: Muscle Fascicle
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MUSCULAR TISSUE
2. CARDIAC MUSCLE• Function
– Contracts to propel blood into circulatory system
• UNDER MICROSCOPE
– Branching cells– Uni-nucleate– Intercalated discs
• Location– Occurs in walls of heart
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MUSCULAR TISSUE
3. SMOOTH MUSCLE
• UNDER MICROSCOPE
– Spindle-shaped cells with
central nuclei
– Arranged closely to form
sheets
– No striations
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MUSCULAR TISSUE
• Function
– Propels substances along
internal passageways
– Involuntary control
• Location
– Mostly walls of digestive tract , blood vessels,
reproductive system.
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Recognize the three types of muscles ?
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Thank you