Lec 5 Swim Bladder

Question 1

Difference between swimbladder and lungs

Answer 1

lungs are used for respiration while swimbladders function primarily to provide buoyancy. Both arise developmentally from the same embryonic tissue, the foregut. The most significant anatomical differences between the two are that lungs are paired and arise from the ventral margin of the foregut, while swimbladders are single and emerge from the dorsal margin

Question 2

Function of gas bladders

Answer 2

The primary function of gasbladders in the vast majority of living fishes is to provide neutral buoyancy by serving as hydrostatic organs. When gasbladders function as hydrostatic organs, they are called swimbladders

Question 3

Swim bladder function

Answer 3

1. Maintain a gas-filled space inside the body cavity of the fish 2. Vary the volume of gas in response to changing hydrostatic demands

Question 4

Two ways swim ladder produces sound

Answer 4

Indirectly the swimbladder acts as a resonator to change the quality of the sound emitted by some other organ. For example, stridulation of pharyngeal teeth or moving the bones of the pectoral girdle may set up vibrations that are picked up by the swimbladder and amplified. 2. Directly the swimbladders is used to produce underwater sounds either by pushing gas from the bladder out through the mouth (belching) or by contraction of either the muscular wall of the bladder itself or of specialized muscles that cause the bladder to resonate (drumming); the sound vibrations are then passed out through the body tissues