Fill in the table “Internal structure of fish”.

Organ system Departments Functions of departments
Musculoskeletal Skull (upper and lower jaws, gill covers, gill arches, orbital bones) The skull protects the brain, the gill covers – the gills
Spine (numerous vertebrae with processes) Inside the spine is the spinal cord; muscles are attached to the processes; ribs support the torso
Extremities (fins) Movement in water, maintaining balance
Muscle Provide a variety of body movements, the release of heat and electricity in the body


Oral cavity, jaws with teeth, pharynx Loot capture; water flows through the throat to the gills
Esophagus, stomach Digestion of food under the influence of gastric juice
Intestine, pancreas, liver, gallbladder, anus Digestion of food under the influence of the juices of the pancreas, liver and bile. In the intestines, nutrients are absorbed into the blood
Swim bladder Only found in bony fish Serves for immersion and ascent
Respiratory system Gills Participate in gas exchange
Circulatory system


Heart (two chambers: atrium and ventricle), abdominal aorta, branchial arteries, dorsal aorta, veins, capillaries The blood flowing through the heart travels through the body, is enriched with oxygen, gives off oxygen and returns to the heart through the veins
Nervous system Brain (oblong, cerebellum, middle, intermediate, anterior) with nerves extending from it Ensure the functioning of the senses and some internal organs
Spinal cord with nerves extending from it Regulate the work of the organs of movement and internal organs


Kidney Purify the blood from harmful substances and waste products
Ureters Direct urine to the bladder
Bladder Urine accumulator; removing urine from the body
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