Thermal expansion sphere and ring demonstrations

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Biology on Instagram: "Muscle Contraction Mechanism The muscle fiber action potential always precedes the increase in intracellular Ca2+, which always precedes muscle contraction. One single action potential leading to an increased intracellular Ca2+ from sarcoplasmic reticulum release produces a single muscle contraction known as a twitch. Source | link https://youtu.be/gJ309LfHQ3M?si=0HVG7Zu1LSFNYxCk #musclefibers #cellandmolecularbiology #anatomy #physiology #molecularbiology"