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What motor neuron and all the muscle fibers it innervates called?
the motor unit
Skeletal muscle fiber is controlled by a motor neuron at a single?
Each muscle cell is only innervated by a single motor neuron, but each motor neuron innervates any number of muscle cells. When an action potential travels down the axon of an alpha motor neuron, it will depolarize several muscle cells at the same time, a phenomenon known as summation.
What is the neurotransmitter of alpha-motor neuron?
Alpha-Motor neurons release the neurotransmitter acetylcholine at a synapse called the neuromuscular junction. When the acetylcholine binds to acetylcholine receptors on the muscle fiber, an action potential is propagated along the muscle fiber in both directions.
What molecule is connected to the Z line?
The molecule connected to the Z line in muscle fibers is alpha-actinin. Alpha-actinin helps anchor actin filaments at the Z line, providing structural support and stability during muscle contractions.
What fiber type have the largest diameter axons?
The largest diameter axons are found in type A-alpha fibers, which are responsible for motor functions in the body. These fibers conduct signals quickly and are important for coordinated muscle movement.
When does the activation of a motor neuron occur in a stretch reflex?
The activation of a motor neuron in a stretch reflex occurs when muscle spindles detect a stretching of the muscle, leading to the generation of action potentials. These signals are transmitted to the spinal cord, where they synapse directly with alpha motor neurons. This direct connection allows for a rapid response, causing the muscle to contract and counteract the stretch almost immediately. This reflex arc is crucial for maintaining posture and balance.
Fiber type in anterior ramus?
alpha spinal motor neuron axons leave the spinal column and enter the nerves via the ventral rami.
What causes depolarisation of sarcolemma of muscle fibre?
An incoming action potential to an alpha motor neuron causes acetylcholine (Ach)release at the end plate, Ach binds to Ach receptors on the sarcolemma causing a sodium influx which causes depolarization.
What is the neurotransmitter of the motor neuron?
Alpha-Motor neurons release the neurotransmitter acetylcholine at a synapse called the neuromuscular junction. When the acetylcholine binds to acetylcholine receptors on the muscle fiber, an action potential is propagated along the muscle fiber in both directions.
Which fibers carry action potential to cause skeletal muscles to contract?
Alpha motor neurons
What is the pathway used to innervate a pinky finger?
If you want to move your pinky finger - specifically, to abduct the digiti minimi, first the brain decides to move it. It sends a signal (an action potential) to the alpha motor neuron (that goes down the spinal cord to the ulnar nerve, all the way to the muscle in the finger). The action potential in the neuron causes an action potential in the muscle, which, by excitation-contraction coupling, causes the contraction of the muscle, and thus the movement of the finger.
What is the location of a motor neuron?
In vertebrates, the term motor neuron (or motoneuron) classically applies to neurons located in the central nervous system (or CNS) that project their axons outside the CNS and directly or indirectly control muscles. The motor neuron is often associated with efferent neuron, primary neuron, or alpha motor neurons.Source:Wikipedia (search Motor neuron, to read more).
