Outline how muscle contraction is initiated in the cell and include the role for Ca2+ in...

Outline how muscle contraction is initiated in the cell and include the role for Ca²⁺ in this process.

Expert Solution

Muscle contraction is initiated by a signal sent by the central nervous system via a motor neuron. Motor unit is formed by constitution of motor neuron along with the muscle fibre. The junction that formed between the motor neuron and the sarcolemma of the muscle fibre is called neuromuscular junction or motor end plate. The neurotransmitter acetylcholine release when the neural signal reaching this junction which help in generating an action potential in the sarcolemma. This action potential spread throughout the muscle fibre that result in releasing of calcium ion into the sarcoplasm. Due to release of calcium ion the level of calcium increases. Now calcium ion bond with subunit of troponin on actin filaments that favors in removing the mask of active site for myosin. Now the exposed active site on actin filament bind with myosin head. This process is occur by utilizing energy from ATP hydrolysis. This form cross bridge. Attached actin filament pulled towards the centre of 'A' band that help in pulling the 'Z' line attached to this actin inward and help in causing a shortening of sarcomere i.e., contraction. 'I' band get reduced but 'A' band have same length during shortening of muscles.

gladiator answered 1 year ago

c) skeletal muscle contraction: explain the role of Ca2+ in the development of a twitch and...

c) skeletal muscle contraction: explain the role of Ca2+ in the development of a twitch and explain the relationship between action potential frequency, twitches and tetanus

1. How is the contraction of a skeletal muscle cell different than the contraction of a...

1. How is the contraction of a skeletal muscle cell different than the contraction of a smooth muscle cell? How does this aid in each muscle cell's function? 2. What is the purpose of myoglobin in slow-twitch muscle fibers? Why is there more myoglobin in slow-twitch muscle fibers than in fast-twitch fibers? 3. What is the purpose of gap junctions in cardiac muscle cells and some smooth muscle cells?

1. How is the contraction of a skeletal muscle cell different than the contraction of a...

1. How is the contraction of a skeletal muscle cell different than the contraction of a smooth muscle cell? How does this aid in each muscle cell's function? 2. What is the purpose of myoglobin in slow-twitch muscle fibers? Why is there more myoglobin in slow-twitch muscle fibers than in fast-twitch fibers? 3. What is the purpose of gap junctions in cardiac muscle cells and some smooth muscle cells?

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Outline how muscle contraction is initiated in the cell and include the role for Ca2+ in...

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Expert Solution

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c) skeletal muscle contraction: explain the role of Ca2+ in the development of a twitch and...

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