Acetylecholine is typically associated with the opening of ___________________ in the synapses of the motor cortex resulting in __________________________. a.) Ligand-gated sodium channels; hyperpolarization b.) Calcium channels; depolarization c.) Calcium channels; hyperpolarization d.) Ligand-gated sodium channels; depolarization
Acetylecholine is typically associated with the opening of ___________________ in the synapses of the motor cortex resulting in __________________________.
a.) Ligand-gated sodium channels; hyperpolarization
b.) Calcium channels; depolarization
c.) Calcium channels; hyperpolarization
d.) Ligand-gated sodium channels; depolarization
Motor neuron depolarization refers to a change in the electrical charge across the membrane of a motor neuron that makes it more likely to fire an action potential. In the resting state, the inside of the motor neuron is negatively charged relative to the outside, due to the presence of more negatively charged ions inside the neuron. When the motor neuron receives a signal from the nervous system, ion channels in the neuron's membrane open and positively charged ions, such as sodium ions, flow into the cell. This causes the inside of the neuron to become less negative, or more positive, in a process called depolarization. If the depolarization reaches a certain threshold, it triggers an action potential, which is a brief electrical impulse that travels down the length of the neuron and can activate muscle fibers at the end of the neuron. This allows the motor neuron to transmit signals from the nervous system to muscles and initiate movement.
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