Why do two ears bulge when a frog quacks? ！

Frogs mostly hide quietly and alone in the dark, making no noise and not making contact with their own species. But during the breeding season, they move into the water in groups, and the males make noises, and they are active day and night, especially when it rains.

Males will make different sounds depending on the occasion, such as the domain cry when establishing a field to warn other males not to approach, the encounter cry when expelling other males or fighting, the courtship cry that attracts the female, the mating cry after contact with the female, the release cry when being held by another male frog or other species of frog, and the emergency cry when caught by a natural predator, the female will only make a cry for help. However, no matter what kind of call it is, each frog has its own unique sound frequency, which has the function of species identification to avoid hybridization.

Not all frogs make calls, and those that don't make a call don't have a vocal sac and the eardrum is not obvious. In general, frogs that breed in streams are less noisy or less vocal because the currents are so loud that they tend to drown out their calls, forcing frogs that lay eggs in streams to find other ways to attract females.

When a frog quacks, it is its song membrane that bulges, not its ears; It has very good hearing, so it doesn't bark when a person walks far away from the frog. The frog uses its call to court, which shows that its hearing is extraordinary.

In order to increase the vibration of the sound is bulging.

Standard answer. The little frog hears these 7 knocks on the door, and the sound waves pass through the middle ear (phonics) Inner ear (cochlear sensory transduction) Auditory receptors are located in the basement membrane:

At rest, the hair cell resting potential.

Approx. -80mV. When the basement membrane vibrates to bend the short cilia to the long cilia side, the "mechanical gating channel at the top of the short cilia" opens, causing K+ influx to depolarize the membrane, and the membrane potential change causes the voltage-gated calcium channel at the bottom of the hair cell to open, triggering the release of transmitters, and also activates the calcium-activated potassium channel at the bottom of the hair cell, causing K+ efflux, and the skin tightness field restores the membrane potential to the resting potential level. (This is the mechanism by which receptor potentials are produced by all hair cells in the capillary mask and vestibular organs in the cochlea.)

The first segment + auditory receptors are excited, generating auditory nerve action potentials, which then transmit information to the auditory center to produce hearing. Then the little frog can react subsequently 888

So the correct answer should be: a mechanically gated channel at the tip of the short cilia.