Draw a diagram of the sequence of events that lead from the excitation of a soma
ID: 57002 • Letter: D
Question
Draw a diagram of the sequence of events that lead from the excitation of a somatic motor neuron in the spinal cord to the contraction of one of the skeletal muscle fibers in the neuron's motor unit. Include as much detail as possible: ions, channels, receptors, neurotransmitters, membrane potentials, equilibrium potentials, gradients, contractile proteins, regulatory proteins, anatomical structures, the graded potential, the action potential, the end plate potential, and which steps require ATP.
Draw a diagram of the sequence of events that lead from the excitation of a somatic motor neuron in the spinal cord to the contraction of one of the skeletal muscle fibers in the neuron's motor unit. Include as much detail as possible: ions, channels, receptors, neurotransmitters, membrane potentials, equilibrium potentials, gradients, contractile proteins, regulatory proteins, anatomical structures, the graded potential, the action potential, the end plate potential, and which steps require ATP.
Draw a diagram of the sequence of events that lead from the excitation of a somatic motor neuron in the spinal cord to the contraction of one of the skeletal muscle fibers in the neuron's motor unit. Include as much detail as possible: ions, channels, receptors, neurotransmitters, membrane potentials, equilibrium potentials, gradients, contractile proteins, regulatory proteins, anatomical structures, the graded potential, the action potential, the end plate potential, and which steps require ATP.
Explanation / Answer
I will draw a flow diagram.
Normally, a somatic motor neuron conducts an action potential when excited-----> this action potential travels entire sarcolemma------> from here it reaches the interior of the muscle fibre through T- tubules (these T-tubules are extensions of sarcolemma itself)---- >T- tubules make contact with Sarcoplasmic reticulum at points known as traids-------> At the triad point, the Sarcoplasmic reticulum is joined to the T-tubule via a calcium channel------> These calcium channels are voltage gated.-----> As the action potential reaches these voltage gated channels , the channel open-----> calcium rapidly moves into the sarcoplasm of skeletal muscle fibres, -----> which contract -----> The entire phenomenon is known as Excitation/contraction coupling.
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