Question

read the paragraph. despite its name, the pacific sea horse is actually a type of fish. its horse - shaped head gives it its name. this creature lives in the pacific waters off the west coast of the americas, from peru to southern california. like many other ocean fish, sea horses face the constant challenge of losing water to their saltier environment. when a sea horse sees a predator, its nervous system kicks into high gear. which structure is responsible for transmitting signals from one nerve cell to the next? cytoplasm nucleus cell membrane mitochondria

Explanation:

Nerve - cell signal transmission occurs across synapses at the cell - membrane level. The cell membrane contains ion channels and receptors that are involved in the propagation of electrical and chemical signals from one nerve cell to another. Cytoplasm is the cell's internal fluid, the nucleus contains genetic material, and mitochondria are the cell's power - houses, none of which are directly responsible for nerve - cell signal transmission.

Answer:

cell membrane