Sensory Systems of Sharks

The lateral line system provides sharks with a form of distant touch, operating through sensory cells along the body. These hair-like receptors 1 pressure changes and subtle water currents created by struggling fish. By interpreting the 2 of incoming vibrations, sharks can swiftly track moving targets without relying on sight. This hydrodynamic sense is particularly 3 for hunting in turbid waters where visibility is severely 4.

• direction
• impaired
• fragile
• velocity
• register
• advantageous
• generate

A shark's sense of smell is remarkably acute, capable of identifying amino acids dissolved in minute concentrations. Paired nasal openings on the underside of the snout allow the animal to 1 slight time delays in odorant arrival. By comparing chemical signals received by each nostril, the predator determines the exact 2 of an odour plume. This directional capability ensures efficient navigation towards distant food sources with minimal 3.

• deviation
• origin
• turbulent
• release
• discern
• quantity

Although once considered poor, shark vision is highly adapted for low-light marine environments. Behind the retina lies a reflective layer known as the tapetum lucidum, which bounces light back through the photoreceptors to 1 visual sensitivity. Many species can also adjust specialised pigment cells to 2 glare in bright shallow waters. Consequently, sharks maintain sharp contrast perception across a broad 3 of oceanic depths.

• restrict
• expand
• range
• enhance
• volume
• minimise

Sharks rely on an internal ear mechanism to perceive underwater sound waves over vast distances. Sensory cells within the fluid-filled otolith organs are tuned primarily to 1 low-frequency acoustic vibrations between twenty and several hundred hertz. Because wounded marine animals typically produce irregular, low-pitched noises, auditory cues often serve as the first stimulus to 2 predatory attention, initiating long-range tracking long before visual contact is 3.

• established
• amplify
• diminish
• obscured
• attract
• capture