If a demyelinating disease slows action potential propagation in a motor neuron, which consequence follows for muscle contraction?

💡 Explanation

Because myelin sheaths insulate axons, action potentials propagate faster via saltatory conduction. Slowed propagation delays the signal reaching the neuromuscular junction, therefore muscle activation speed decreases, rather than force increasing because the action potential frequency is unaffected.

• If a bee sting introduces venom into a person, and they develop systemic vasodilation, bronchoconstriction, and increased vascular permeability, which process explains this reaction?
• Why does parathyroid hormone (PTH) secretion generally increase bone mineral resorption when blood calcium levels are low?
• Which outcome results when thyroglobulin production malfunctions in the thyroid?
• A patient experiences increasing shortness of breath, normal blood pressure, and pulmonary congestion. What causes this effect when cardiac output falls despite elevated sympathetic activity?
• Why does cancellous bone density decrease more rapidly than cortical bone density in postmenopausal women undergoing estrogen reduction?
• A patient presents with dehydration after prolonged vomiting. Which mechanism explains why the kidneys initially reduce urine output, but the urine becomes more concentrated with increased sodium?