CATDOLL : CATDOLL: What role do fish scales play for fish?

1. What role do fish scales play for fish?

1. Fish scales have the function of protecting the fish body and making the fish grow healthily;

2. Fish scales can reduce the collision between fish and external objects, thereby reducing friction;

3. Fish scales can fully preserve the water of fish and will not cause water loss.

First of all, fish scales are the second life of fish. Without the protection of fish scales, the life span of fish may be greatly reduced, and they may even die at birth. Fish are also more prone to skin diseases. Relatively speaking, fish scales indirectly prevent the growth of skin diseases and can also reduce the impact when attacked by other species.

Secondly, fish scales can greatly reduce the friction on the fish body. Fish must live in water, and friction is inevitable when in contact with water all year round. If they encounter mud and sand, the friction coefficient will be very large. Fish scales can greatly reduce the harm caused by friction to fish.

Finally, for freshwater fish, there is an osmotic pressure balance. Long-term contact with water makes the fish scales act like a thin film that isolates the water, thus creating a dynamic balance effect, so that the fish's body will greatly reduce contact with water.

2. What is the function of the pituitary gland?

The pituitary gland is an endocrine gland of the human body, which mainly secretes endocrine hormones. The hormones secreted include thyroid-stimulating hormone, gonadotropin, insulin-stimulating hormone, adrenocorticotropic hormone, etc. It mainly regulates the lower secretory glands of the human body and is a central endocrine regulating organ. Once a pituitary tumor or endocrine hyperfunction occurs in the human body, it is easy to cause endocrine dysfunction.

3. Why do we use carp pituitary gland as fish oxytocin?

Isolation, water change, oxygenation, temperature increase by 28 degrees~

The above are all methods that can artificially induce labor~

The water you change should be exposed to the sun and have yellow medicine added~ The survival rate of tropical fish is very low when the temperature is low~ If it is a large goldfish, you can use the pituitary hormone of carp to promote~

4. What are the differences between fish nerve cells and human nerve cells?

The nervous system is very important for the life activities of fish. It is composed of the brain, cranial nerves, spinal cord and spinal nerves. The brain and spinal cord are central nerves, and cranial nerves and spinal nerves are peripheral nerves. The brain is divided into the telencephalon and diencephalon, cerebellum and medulla oblongata. The telencephalon is the olfactory center; the diencephalon is also called the thalamus, which is connected to the pituitary gland. The midbrain is the visual center, the cerebellum manages movement, and the medulla oblongata manages multiple centers of physiological activities such as breathing and circulation. Spinal nerves are also called mixed nerves.

The structure of fish's sensory organs is adapted to aquatic life. The skin has the functions of touch, temperature, water flow and direction determination. The main function of the lateral line is to determine direction and sense water flow. The inner ear of fish plays a role in hearing and balancing the fish body. The structure of fish eyes is not much different from that of human eyes. There are no upper and lower eyelids and tear glands. It is a visual organ. The olfactory sac is usually composed of many olfactory mucosal folds and produces smell. It plays an important role in fish foraging, reproduction, night clustering, warning response and migration. Taste buds produce taste, but they are generally not very sensitive.

5. Briefly describe the nervous system composition and characteristics of fish?

The nervous system is very important to the life activities of fish. It is composed of the brain, cranial nerves, spinal cord and spinal nerves. The brain and spinal cord are the central nervous system, and the cranial nerves and spinal nerves are the peripheral nerves.

6.What is the function of the lateral line of fish?

The lateral line is an important sensory organ for fish to adapt to life in water. Most fish would find it difficult to survive in water without a lateral line.

Vision: The lateral line can also make up for the lack of vision of fish; fish, like other vertebrates, generally have eyes. However, the intensity of light has a great impact on the structure of fish eyes.

Touch: Fish have a very developed sense of touch, but they do not have specialized touch receptors. Some people have done experiments and found that when a hair tactile meter is used to measure one of the scales on the upper lateral line, a touch threshold close to the most sensitive area of ​​human skin can be obtained. This shows that the lateral line receptors are also quite sensitive as touch receptors.

7.What is the function of nerves?

The main function of the nervous system is to play a leading role in the human body. It is the most important part of the human nervous system, including the brain and spinal cord. Its main function is to transmit, store and process information. On the one hand, it controls and regulates the activities of various organ systems, making the human body a unified whole. On the other hand, through the analysis and synthesis of the nervous system, the body responds to the stimulation of environmental changes.

8. What is the function of the sympathetic nervous system?

The function of the sympathetic nerve is to regulate the activities of the heart and other internal organs. The sympathetic nerve is part of the autonomic nerve. It is composed of the central part, sympathetic trunk, ganglion, nerve and plexus. The central part is located in the gray matter lateral angle of the entire length of the thoracic spinal cord and the 1st to 3rd segments of the lumbar spinal cord. The sympathetic trunk is located on both sides of the spine, and is composed of sympathetic trunk ganglia and interganglionic branches. It can be divided into 5 parts: cervical, thoracic, lumbar, sacral and coccygeal.

9. What is the basic pattern of the fish nervous system?

Regarding this question, the basic model of the nervous system of fish is composed of the central nervous system and the peripheral nervous system. The central nervous system includes the brain, cerebellum and spinal cord, which is responsible for processing information from the peripheral nervous system and issuing commands to control body behavior.

The peripheral nervous system is composed of sensory neurons and motor neurons, which are responsible for receiving external stimuli and transmitting information, while regulating the body's muscle and gland activities. The fish nervous system is simpler than that of mammals, but it has also undergone a complex and differentiated evolution during the evolution process.

10. What is a ganglion and what is its function?

Nerve knots involve the central parts between various nerves, such as the central and peripheral nervous systems, so the ganglia connecting these parts are ganglia, which mainly play the role of transmitting excitement, thereby controlling joy, anger, sadness and various biological activities of the human body. Under normal circumstances, whether it is a disorder or damage to the nerves or ganglia, it will cause restrictions on the scope of human activities and the patient cannot move independently. It should be checked in time and acupuncture treatment can be performed.