What is the physiological significance of homeostasis in the internal environment How does the body

Extracellular fluid of the human body.

Including plasma, interstitial fluid.

and lymph, which constitute the fluid environment in which cells in the body depend, called the internal environment.

Under normal physiological conditions, various physical and chemical properties of the internal environment.

It is a homeostasis that remains relatively stable, which is called the internal environment. The homeostasis of this internal environment is not a fixed and unchanging state of rest, but a state of dynamic equilibrium. It is manifested that the physical and chemical properties of the internal environment only change in a small range, such as maintaining body temperature at about 37 and plasma pH at about 37.

Homeostasis of the internal environment is necessary for cells to maintain normal physiological functions.

It is also a necessary condition for the body to maintain normal life activities, and the imbalance of homeostasis in the internal environment can lead to diseases. The maintenance of homeostasis in the internal environment depends on the stability of the functional state of various organs, especially the internal organs, the normal of various regulatory mechanisms of the body, and the role of blood bonds.

1. Factors affecting the physical and chemical properties of the internal environment: pH, osmotic pressure.

temperature, etc. 2 The pH of normal human blood is too high or too low for more than one unit, and alkalosis will occur.

or acidosis. The body temperature of a normal person is, and clinical observations show that:

The osmolality of normal human plasma is about 770 kPa at 37, which is equivalent to the osmotic pressure of normal saline.

3 The way in which the pH of the blood is regulated in the normal range: the buffering effect of the buffering substance (pair).

Buffer substance: weak acid, strong alkali salt, such as: H2CO3 NaHCO3, NAH2PO4 NA2HPO4

1) Compensatory regulatory response: Any change in the internal environment will cause the body to automatically regulate the activities of tissues and organs, and produce some reactions to reduce this change

2) Neuro-humoral regulation.

Induction: Normal body in the nervous system.

Under the regulation of body fluids, through the coordinated activities of various organs and systems, the relative stability of the internal environment is maintained, which is called homeostasis

Homeostasis is a necessary condition for the body to carry out normal life activities When homeostasis is disrupted, it causes cell metabolism disorders and leads to diseases

Homeostasis is that under the regulation of the nervous system and endocrine system, the body will make corresponding adjustments to various changes in the internal environment, so that the osmotic pressure, pH, temperature and various chemical components of the internal environment remain relatively stable.

Regulatory mechanism: under the joint action of nerve and humoral regulation, it is realized through the division of labor and coordination of various organs and systems of the body.

Mediation channels: positive feedback adjustment, negative feedback adjustment.

Hand hit. Thank you.

1. Internal environment:

In multicellular organisms, the environment in which cells are directly in the body, i.e., the extracellular fluid, is called the internal environment.

Physiological significance: The internal environment is the place where the cell directly exchanges materials, and it is the environment in which the cell lives directly. The oxygen and various nutrients required for cell metabolism can only be taken from the internal environment, and the carbon dioxide and metabolic end products produced by cell metabolism also need to be directly excreted into the internal environment, and then transported through the blood circulation and excreted from the body by the respiratory and excretory organs.

In addition, the internal environment is where cells live and move.

2. Homeostasis: Homeostasis refers to the fact that physiologists regulate the normal body to make the coordinated activities of various organs and systems to jointly maintain a relatively stable state of the internal environment.

Physiological significance: The physiological significance of internal environment homeostasis The metabolism of the body is composed of many complex enzymatic reactions in the cell, and the enzymatic reaction requires mild external conditions, such as temperature, pH, etc., must be kept within the appropriate range in order for the enzymatic reaction to proceed normally.

It can be seen that the homeostasis of the internal environment is a necessary condition for the body to carry out normal life activities. When the homeostasis of the internal environment is disrupted, it causes a disorder of cell metabolism and leads to disease.

For example, when the amount of calcium and phosphorus in the blood decreases, it can affect the calcification of bone tissue, which is manifested as osteomalacia in adults and rickets with impaired bone growth and ossification in children. High blood calcium can cause muscle weakness and other diseases.

1. The internal environment is a medium of material exchange, which takes place between the cell and the external environment. The extracellular fluid is called the internal environment, and this extracellular fluid is the environment in which the cell is in the body. In this internal environment, cells directly exchange substances.

2. The homeostasis of the internal environment means that under normal physiological conditions, the various components and physical and chemical properties of the internal environment of the body only change within a small range. Instead of being in an unchanging state of rest, it is in a state of dynamic equilibrium.

3. The normal body makes various organs and systems coordinate their activities through regulation to maintain a relatively stable state of the internal environment.

internal environment. It refers to the body fluids of multicellular animals, including tissue fluids.

Plasma and lymphatic fluid.

Homeostasis is the mechanism by which organisms are able to keep their internal environment stable within a small range. This is mainly done through a series of feedback mechanisms.

Homeostasis in higher animals is mainly based on humoral regulation and neuromodulation.

to maintain. The significance is:

1. It can expand the scope of adaptation of organisms to the external environment, and is less restricted by the external environment.

2. It can keep the enzymes of living organisms in the best state and let life activities be carried out in an orderly manner.

An important way to maintain homeostasis in the body is negative feedback regulation.

Negative feedback regulation refers to the use of belts to make ecosystems.

Achieving or maintaining equilibrium or homeostasis, the result is inhibition and attenuation of changes in the kind of components that initially change. The main significance is to maintain the homeostasis of the internal environment of the body, and the feedback control system is usually in a stable state when the feedback situation is negative.

The main significance of negative feedback regulation is to maintain the steady state of the internal environment of the body, and the feedback control system is usually in a stable state when the negative feedback situation occurs. There is also a negative feedback regulation: in the human body, the hypothalamus.

as an endocrine system.

The regulatory center, through the secretion of hormone-releasing hormone, makes the pituitary gland secrete sail-stimulating spine hormone, acts on other endocrine glands, promotes the secretion of hormones by other endocrine glands, and various endocrine glands secrete too much excidatory orange osmosis, which in turn inhibits the function of the hypothalamus and pituitary gland, which is called negative feedback regulation.

Answer]: The physiological significance of internal environmental homeostasis is a necessary condition for cells to maintain normal physiological functions, and it is also a necessary condition for the body to maintain normal life activities.

The body maintains homeostasis in the internal environment through the activities of various organs. For example, respiratory activity inhales oxygen and exhales carbon dioxide; With the help of the circulatory system, the blood transports oxygen and carbon dioxide, which ultimately keeps all organs and cells in the body with enough oxygen** to maintain normal metabolism.

a.The amount of body fluid remains the same.

b.The physicochemical properties of the fluid in the cell plexus are relatively constant.

c.The chemical composition of the intracellular fluid and the extracellular fluid is the same.

d.The properties of extracellular fluid dismantling are relatively constant.

Correct answer: d

The homeostasis of the internal environment of the organism refers to: (bucket ride).

a.The physicochemical properties of extracellular fluids are relatively constant.

b.The physicochemical properties of extracellular fluids remain unchanged.

c.The intracellular liquefaction of the liquefied glitter is relatively constant.

d.The chemical composition of the extracellular fluid remains constant.

Correct Answer: The physicochemical properties of extracellular fluids are relatively constant.