"helmholtz’s study of nerves in the frog showed that a. there was specificity in sensory nerves b. there was specificity in motor nerves c. nerves conducted on an all or none basis d. the speed of neural transmission was measureable"

The answer is D; The speed of neural transmission is measurable

Explanation:

Helmholtz constructed an apparatus specially to measure short time intervals of the order of ten-thousandths of a second, Helmholtz was able, in an elegant experiment published in 1850, to measure precisely the speed of conduction of the nerve signals in the motor nerve of the frog's leg.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave