Describe structure and functions of striated muscle fibre
Answers
Answered by
5
In addition to the actin and myosincomponents that constitute the sarcomere, skeletal muscle fibers also contain two other important regulatory proteins, troponin and tropomyosin, that are necessary for muscle contraction to occur. These proteins are associated with actin and cooperate to prevent its interaction with myosin. Skeletal muscle cells are excitable and are subject to depolarization by the neurotransmitter acetylcholine, released at the neuromuscular junction by motor neurons.[6]
Once a cell is sufficiently stimulated, the cell's sarcoplasmic reticulum releases ionic calcium (Ca2+), which then interacts with the regulatory protein troponin. Calcium-bound troponin undergoes a conformational change that leads to the movement of tropomyosin, subsequently exposing the myosin-binding sites on actin. This allows for myosin and actin ATP-dependent cross-bridge cycling and shortening of the muscle.
Once a cell is sufficiently stimulated, the cell's sarcoplasmic reticulum releases ionic calcium (Ca2+), which then interacts with the regulatory protein troponin. Calcium-bound troponin undergoes a conformational change that leads to the movement of tropomyosin, subsequently exposing the myosin-binding sites on actin. This allows for myosin and actin ATP-dependent cross-bridge cycling and shortening of the muscle.
Attachments:
Answered by
7
┏─━─━─━─━∞◆∞━─━─━─━─┓
✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✮✭
┗─━─━─━─━∞◆∞━─━─━─━─┛
➧Types 0f Muscular Tissue are:-▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃⤵
❶❫ Striated Muscles:-▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Skeletal Muscles.
◉ It attached to bone in Limbs.
◉ Types of control is voluntary.
◉ It forms bundles.
◉ No. of nuclei is Multinucleate.
◉ Nerve supply is from central nervous system.
◉ Speed of contraction is most rapid.
❱ Its Functions are:-════════════════☟
①❭ They are responsible for locomotion.
②❭ It control the breathing movement.
③❭ This muscles are also help in in digestion of food.
④❭ They are also help in blinking of Eyes.
❷❫ Non-Striated Muscles:-▬▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Smooth Muscles.
◉ It attached in the walls of stomach, intestine & blood vessels.
◉ Types of control is involuntary.
◉ It forms sheet or sphincter.
◉ No. of nuclei is uninucleate.
◉ Nervous supply is from autonomic nervous system.
◉ Speed of contraction is slowest.
❱ Its Functions are:-════════════════☟
①❭ Muscles of iris & ciliary body of eye control amount of light to enter the eye.
②❭ Ciliary muscles body are responsible for accommodation of lens.
③❭ Sphincter bring about 0pening & closing of anal aperture, tubes & cavities.
④❭ They relax & contract the walls of arteries, ducts & uterus.
❸❫ Cardiac Muscles:-▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Heart Muscles.
◉ It attached in the walls of hearts.
◉ Types of control is Involuntary.
◉ It forms a network.
◉ No. of nuclei is Uninucleate.
◉ Nerve supply is from autonomic nervous system.
❱ Its Functions are:-════════════════☟
①❭ They helps in pulsating movement of heart chamber.
②❭ They pump blood from heart into the blood vessels.
_________ Thanks...✊
✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✮✭
┗─━─━─━─━∞◆∞━─━─━─━─┛
➧Types 0f Muscular Tissue are:-▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃⤵
❶❫ Striated Muscles:-▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Skeletal Muscles.
◉ It attached to bone in Limbs.
◉ Types of control is voluntary.
◉ It forms bundles.
◉ No. of nuclei is Multinucleate.
◉ Nerve supply is from central nervous system.
◉ Speed of contraction is most rapid.
❱ Its Functions are:-════════════════☟
①❭ They are responsible for locomotion.
②❭ It control the breathing movement.
③❭ This muscles are also help in in digestion of food.
④❭ They are also help in blinking of Eyes.
❷❫ Non-Striated Muscles:-▬▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Smooth Muscles.
◉ It attached in the walls of stomach, intestine & blood vessels.
◉ Types of control is involuntary.
◉ It forms sheet or sphincter.
◉ No. of nuclei is uninucleate.
◉ Nervous supply is from autonomic nervous system.
◉ Speed of contraction is slowest.
❱ Its Functions are:-════════════════☟
①❭ Muscles of iris & ciliary body of eye control amount of light to enter the eye.
②❭ Ciliary muscles body are responsible for accommodation of lens.
③❭ Sphincter bring about 0pening & closing of anal aperture, tubes & cavities.
④❭ They relax & contract the walls of arteries, ducts & uterus.
❸❫ Cardiac Muscles:-▬▬▬▬▬▬▬▬▬▬▬☟
◉ Also known as Heart Muscles.
◉ It attached in the walls of hearts.
◉ Types of control is Involuntary.
◉ It forms a network.
◉ No. of nuclei is Uninucleate.
◉ Nerve supply is from autonomic nervous system.
❱ Its Functions are:-════════════════☟
①❭ They helps in pulsating movement of heart chamber.
②❭ They pump blood from heart into the blood vessels.
_________ Thanks...✊
Similar questions