Recall that, in a distance versus voltage plot, the “leading edge” of a propagating action potential is the part farther away from the site of action potential initiation. Which of the following describes the leading edge of an action potential signal?

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.