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How are the Neuron and skeletal muscle fiber connected?
they are connected with the rope in the body
Does each skeletal muscle fiber has one neuromuscular junction?
Yes, each skeletal muscle fiber has one neuromuscular junction (NMJ) where a motor neuron connects to the muscle fiber. This junction is the site where the motor neuron releases neurotransmitters, specifically acetylcholine, to stimulate muscle contraction. While a single motor neuron can innervate multiple muscle fibers, each individual muscle fiber receives input from only one motor neuron at its NMJ.
Each skeletal muscle fiber is controlled by a motor neuron at a single?
neuromuscular junction
The all-or-none law applies to skeletal muscle function at what level?
The all-or-none law applies to individual muscle fibers within a skeletal muscle. This means that when a muscle fiber is stimulated by a motor neuron, it will either contract maximally or not at all, depending on whether the stimulus reaches the threshold for activation.
Electrical excitation of muscle fiber?
Electrical excitation of a muscle fiber. Skeletal muscle fibers (cells) can be stimulated either by amotor neuron in the body or by a voltage stimulator in the lab. Stimulation given by either method results in a depolarization of the sarcolemma. If the depolarization reaches threshold, an action potential (electrical signal) is initiated.
What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?
sarcoplasmic reticulum
What plays a critical role as a transmitter when neurons meet skeletal muscles?
The critical transmitter at the junction where neurons meet skeletal muscles is acetylcholine (ACh). When a motor neuron is stimulated, it releases acetylcholine into the neuromuscular junction, binding to receptors on the muscle fiber's membrane. This binding triggers depolarization of the muscle cell, leading to muscle contraction. Thus, acetylcholine is essential for communication between the nervous system and skeletal muscles.
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
The structures within the muscle fiber that shorten to cause skeletal muscle contraction are called myofibrils. Myofibrils are composed of repeating units called sarcomeres, which contain thick and thin filaments made of proteins (actin and myosin). When the muscle fiber is stimulated by a nerve impulse, the myosin heads interact with the actin filaments to generate the force required for muscle contraction.
Do smooth or skeletal muscle form a functional syncytium?
Smooth muscle forms a functional syncytium due to the presence of gap junctions that allow electrical signals to pass from one cell to the next, enabling coordinated contractions. Skeletal muscle, on the other hand, does not form a functional syncytium as each skeletal muscle cell (fiber) is innervated individually by a motor neuron and must be stimulated independently.
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 multinucleate muscle fiber?
Skeletal
What is the function of motor end plate?
A motor endplate is a large special synaptic contact between motor axons and each skeletal muscle fiber. Each muscle fiber forms one endplate. Its function is to transmit impulses from nerves to muscles.
