Experiment report of an experiment to observe the tail fin of a goldfish

Experiment report: Observation of the capillaries and nerves of the tail fin of goldfish.

1. Experimental objectives.

1.Observe the microvascular and nerve distribution of the caudal fin of goldfish.

2.Learn about the role of the tail fin in the movement and balance of goldfish.

3.Increase understanding of fish physiology.

Second, the principle of experiment.

The tail fin of a goldfish is an important structure for its swimming and balance. The caudal fin has a complex network of blood vessels, including arteries, veins, and capillaries, that power the goldfish's swimming and help maintain body balance. In addition, the caudal fin also has a neural distribution, receiving nerve signals from the brain and transmitting information to control the tiny movements of the caudal fin.

3. Experimental procedures.

1.Choose a healthy goldfish and observe the appearance of its caudal fin with a microscope.

2.Use a microscope to observe the capillaries of the caudal fin. Particular attention is paid to the distribution and shape of arteries, veins, and capillaries.

3.Observe the nerve distribution of the caudal fin, noting its relationship to blood vessels and its characteristics under the microscope.

4.Observe the dynamic changes of the tail fin as the goldfish swims through a microscope, and pay attention to the shape and angle changes of the tail fin.

5.Record all the details observed, and map the vascular and nerve distribution of the caudal fin.

4. Experimental results and data analysis.

1.The results of the experiment showed that the tail fin of goldfish has a complex vascular network, including many arteries, veins, and capillaries. The arteries are responsible for carrying blood from the heart to the caudal fin, while the veins carry blood from the caudal fin back to the heart.

Capillaries are the transition between these two types of blood vessels and can provide oxygen and nutrients to the muscle tissue of the caudal fin.

2.The distribution of nerves can also be observed in the caudal fin, which mainly follow the vascular network and receive nerve signals from the brain that control the movement of the caudal fin. When viewed under a microscope, nerve cell protrusions can be seen, intertwined with the surrounding vascular structures.

3.When a goldfish swims, the angle and shape of the tail fin changes significantly to adjust the propulsion and direction. Microscopic observation shows that the distribution of capillaries and nerves in the tail fin changes dynamically with the movement of the goldfish.

V. Conclusions. In this experiment, the microvascular and nerve distribution of the tail fin of goldfish was observed through a microscope to understand their role in swimming and balance in goldfish. The results of the experiment showed that the caudal fin has a complex vascular network and nerve distribution, which are essential for the survival and reproduction of goldfish.

Through this experiment, we have a deeper understanding of the physiology of goldfish, and also have a deeper understanding of biological research.

6. Suggestions and prospects.

In future experiments, we can further study the structural characteristics of the tail fin of other fish and compare the similarities and differences of the tail fin of different fish species. In addition, we can also improve the influence of environmental factors such as water pressure and temperature on the function of the tail fin of goldfish, in order to provide a scientific basis for the protection of marine ecosystems and fish health.

Dorsal fin: Keeping the fish on its side, it plays a key role in the balance of the fish, if it is lost, it loses its balance and rolls over.

Pectoral and pelvic fins: balance, if lost, the fish will sway from side to side.

Tail fin: Determines the direction of movement, if lost, the fish will not turn.

Anal fins: Coordinate with the other fins to play a balancing role, if lost, the body shakes slightly.

The dorsal and anal fins of the fish maintain the erect body of the fish.

The tail fin swings from side to side to propel the fish forward.

The pectoral fin controls the direction, and the pectoral fin opens to both sides of the fish, and when it swings back and forth, the fish moves forward; When the pectoral fin swings on one side, the fish turns to the side that does not move.

The pelvic fin keeps the fish body stable.

Objective: To observe the blood flow of the tail fin of goldfish, and to distinguish arteries, veins, capillaries and blood.

Flow. Experimental Equipment:

Goldfish, microscope, wax disc, cotton.

Experimental principle: three types of vascular structure and blood flow characteristics.

Experimental steps: 1. Wrap the head and trunk of the fish with wet cotton.

2. Place the fish in a wax dish.

3. Place the wax tray on the stage.

4. Adjust the microscope to observe the blood circulation in the tail of the fish. Find arteries, veins, and capillaries and observe their blood flow.

Objective: To observe the blood flow of the tail fin of goldfish, and to distinguish arteries, veins, capillaries and blood flow.

Experimental equipment: goldfish, microscope, wax disc, cotton.

Experimental principle: three types of vascular structure and blood flow characteristics.

Experimental process: 1. Wrap the head and trunk of the fish with wet cotton.

2. Place the fish in a wax dish.

3. Place the wax tray on the stage.

4. Adjust the microscope to observe the blood circulation in the tail of the fish. Find arteries, veins, and capillaries and observe their blood flow. Capillaries are characterized by the passage of red blood cells in a single row. The lumen of the veins is relatively large, and the blood flow velocity is faster than that of capillaries and slower than that of arteries.