This study investigates stretch-activated ion channels in tissue-cultured embryonic chick skeletal muscle. The membrane contains a stretch-activated channel that is distinct from nicotinic and Ca²⁺-activated K⁺ channels. The channel has a conductance of 70 pS, a linear current-voltage relationship between -50 and -140 mV, and a reversal potential of +30 mV. Kinetic analysis shows the channel has one open (O) and three closed (C) states, with the rate constant for the C₁-C₂ transition (k₁,₂) being stretch-sensitive. The rate constant varies with the square of the tension as k₁,₂ = k₀·e^(αT²), where α is a constant describing stretch sensitivity. Cytochalasin B treatment increases stretch sensitivity, with α increasing from 0.08 to 2.4 (dyn cm⁻¹)⁻². The channel's open probability is strongly influenced by extracellular K⁺ concentration, increasing from 0.004 in normal saline to 0.26 in high-K⁺ saline. The channel likely gathers force from a large membrane area, possibly through a cytoskeletal network. The channel's properties suggest it could function as a transducer in stretch-sensitive cells. The study also explores the role of secondary messengers and the mechanical link between the channel and the cell membrane. The results indicate that the stretch-activated channel is a direct mechanical transducer, with its activity dependent on membrane tension. The channel's kinetics were analyzed using a four-state model, with the rate constant k₁,₂ showing exponential dependence on applied suction. The study concludes that the stretch-activated channel is a key component in mechanoelectrical transduction, linking mechanical stress to cell excitability.This study investigates stretch-activated ion channels in tissue-cultured embryonic chick skeletal muscle. The membrane contains a stretch-activated channel that is distinct from nicotinic and Ca²⁺-activated K⁺ channels. The channel has a conductance of 70 pS, a linear current-voltage relationship between -50 and -140 mV, and a reversal potential of +30 mV. Kinetic analysis shows the channel has one open (O) and three closed (C) states, with the rate constant for the C₁-C₂ transition (k₁,₂) being stretch-sensitive. The rate constant varies with the square of the tension as k₁,₂ = k₀·e^(αT²), where α is a constant describing stretch sensitivity. Cytochalasin B treatment increases stretch sensitivity, with α increasing from 0.08 to 2.4 (dyn cm⁻¹)⁻². The channel's open probability is strongly influenced by extracellular K⁺ concentration, increasing from 0.004 in normal saline to 0.26 in high-K⁺ saline. The channel likely gathers force from a large membrane area, possibly through a cytoskeletal network. The channel's properties suggest it could function as a transducer in stretch-sensitive cells. The study also explores the role of secondary messengers and the mechanical link between the channel and the cell membrane. The results indicate that the stretch-activated channel is a direct mechanical transducer, with its activity dependent on membrane tension. The channel's kinetics were analyzed using a four-state model, with the rate constant k₁,₂ showing exponential dependence on applied suction. The study concludes that the stretch-activated channel is a key component in mechanoelectrical transduction, linking mechanical stress to cell excitability.