The question of biofilms regarding endoplasmic reticulum and cell membranes 20

It is true that the membrane is fluid, but the substance must be endocytosed from the endoplasmic reticulum to the outside of the cell membrane! Think about it this way, the cell membrane is like a yarn scarf in a circle, when the wind blows, it flows, and the cell membrane is the same, and this is how it flows, but there is something to come out of the scarf, of course, it must be wrapped from the edge of the scarf, but the scarf can't be disconnected by itself and the cell membrane can be disconnected by itself and can grow well, the reason is the same, I can understand the kind of flow you think, but it's not as fluid as you say

The endoplasmic reticulum is connected to the nuclear membrane rather than to the cell membrane;

In the part connected to the nuclear membrane, the membrane of the endoplasmic reticulum only fuses with the outer membrane of the nuclear membrane, and the substances in the nuclear still have to enter and exit through the nuclear pores.

Endocytosis is to complete intracellular digestion, and the vesicles formed after endocytosis separate their internal chemical reactions from the rest of the cell during the digestion process;

That is, the entry of large pieces of material from the outside world into the cell must pass through endocytosis.

The endoplasmic reticulum can be connected to the nuclear membrane and can be free in the cytoplasm, but what you want to endocytosize and excrete is the substance you encapsulate......

Those things also need to be processed by other organelles before they can be excreted as substances required by the organism.

The flow mosaic model is a phospholipid and protein flow mosaic on a membrane.

It is called a membrane because it is insoluble in water and can encapsulate endocytosis. In other words, it is impossible for endocytic efflux to melt into the cell membrane and go out along the endoplasmic reticulum on its own.

Direct flow can only make polar substances on one side and lipids on the other. Unable to ingest the substance, invagination is a kind of wrapping, and it is conducive to the formation of endosomes and lysosomes in the next step to "digest" the external substance.

This statement is not true, the biological membrane in the cell is composed of the nuclear membrane, the endoplasmic reticulum, the Golgi membrane, the cell membrane and the mitochondrial membrane, and the cell capsule is a flowing mosaic rather than all the membranes.

If you want it to be, then the contents of the cell will be complete"Flow"It's good to get out.

<> endoplasmic reticulum. Membrane to cell membrane.

is directly attached, and the endoplasmic reticulum is the cytoplasm.

The membrane system is connected to the cell membrane on the outside and the outer membrane of the nuclear membrane on the inside, organically connecting various structures in the cell into a whole, effectively increasing the membrane area in the cell, and having the role of undertaking the transport of intracellular substances.

The endoplasmic reticulum is a fine membrane system within the cell, which is a system of pipes that intertwine the membranes distributed in the cytoplasm. Between the two membranes is a flat cavity, sac, or cisterna. There are two types of endoplasmic reticulum, one is that there are many small particles attached to the outside of the membrane, and this kind of endoplasmic reticulum with particles is called rough endoplasmic reticulum, and these particles are ribosomes.

ribonucleoprotein ribosome); The other type does not have particles attached to the outer side of the membrane and has a smooth surface, which is called smooth endoplasmic reticulum. The function of the rough endoplasmic reticulum is to synthesize protein macromolecules and transport them from the cell or transport it to other sites within the cell. In cells where protein synthesis is vigorous, the rough endoplasmic reticulum is developed.

in nerve cells.

, the development of the rough endoplasmic reticulum is related to memory. The function of smooth endoplasmic reticulum is related to carbohydrates and lipids.

It is related to the synthesis, detoxification, and assimilation, and also has the function of transporting proteins.

Cell membranes are mainly made up of phospholipids.

Composed of elastic semi-permeable membrane, film thickness 8-10 nm, for animal cells.

The outer side of its membrane is in contact with the external environment, and its main function is to selectively exchange substances, absorb nutrients, discharge metabolic wastes, and secrete and transport proteins.

1. Endoplasmic reticulum.

membrane and fine height hooded round cell membrane.

Directly connected. 2. The endoplasmic reticulum membrane is directly connected to the cell membrane. The endoplasmic reticulum is the membrane system of the cytoplasm, which is connected to the cell membrane on the outside and the outer membrane of the nuclear membrane on the inside, organically connecting the various structures of the cell into a whole, effectively increasing the membrane area in the cell, and having the role of undertaking the transport of intracellular substances.

3. The cell membrane is mainly composed of lipids (mainly phospholipids.

composition of substances such as proteins and sugars; Among them, proteins and lipids are the main ones. Under the electron microscope, it can be divided into three layers, that is, there is a thick electron dense band on the inner and outer sides of the membrane;

4. There is a thick zona pellucida in the middle, and the total thickness of Qi collapsed is about about this structure is not only seen in various cell membranes, but also in various organelle membranes in cells, such as mitochondria.

Endoplasmic reticulum, etc., also have a similar structure.

1. The endoplasmic reticulum membrane and the cell membrane are directly connected.

2. The endoplasmic reticulum membrane is directly connected to the cell membrane. The endoplasmic reticulum is the membrane system of the cytoplasm, which is connected to the cell membrane on the outside and the outer membrane of the nuclear membrane on the inside, organically connecting various structures in the cell into a whole, effectively increasing the membrane area in the cell, and having the role of undertaking the transport of substances in the cell.

3. The cell membrane is mainly composed of lipids (mainly phospholipids), proteins and sugars. Among them, proteins and lipids are the main ones. Under the electron microscope, it can be divided into three layers, that is, there is a thick electron dense band on the inner and outer sides of the membrane;

4. There is a thick zona pellucida in the middle, and the thickness of the total state wheel brigade is about about this structure is not only seen in various cell membranes, but also various organelle membranes in the cell, such as mitochondria, endoplasmic reticulum, etc., also have similar structures.

There are direct or indirect structural connections between various biofilms in the cell. The endoplasmic reticulum membrane is connected to the outer nuclear membrane, and the cavity between the endoplasmic reticulum cavity and the inner and outer nuclear membranes communicates, and a large number of ribosomes are attached to the outer nuclear membrane. The endoplasmic reticulum communicates with the nuclear membrane, making the cytoplasm and the material within the nucleus more closely connected.

In some cells, the endoplasmic reticulum membrane can also be seen to be connected to the cell membrane.

Endoplasmic reticulum is found in various eukaryotic cells except mammalian mature red blood cells. The endoplasmic reticulum is an interconnected lamellar or tubular system composed of biological membranes, and the interstitial space between the membranes is called a cisterna, which is usually not directly connected to the extracellular space and the cytoplasmic matrix. On the one hand, this intracellular membrane system constitutes a pathway for the transport of intracellular substances, and on the other hand, it provides a broad reaction area for various enzyme reactions in the cell.

The endoplasmic reticulum is continuous with the Golgi apparatus and nuclear membrane.

The cell membrane has an important physiological function, which not only enables the cell to maintain a stable metabolic intracellular environment, but also regulates and selects substances to enter and exit the cell. The cell membrane absorbs, digests, and excretes substances outside and inside the cell membrane through pinocytosis, phagocytosis, or exocytosis. Plasma membranes also play an important role in cell recognition, signaling, cellulose synthesis, and assembly of microfibrils.

Some cells do not rely on receptors on the cell membrane to achieve information exchange, such as sterols secreted by some cells, these substances can be used as signals to communicate with other cells, but these substances do not bind to the receptors on the cell membrane, but cross the cell membrane and bind to certain receptors in the nucleus or cytoplasm, thus mediating the information exchange between two cells! Therefore, the physiological role of the cell membrane is not very large, but it is only used to protect the cell.

1. The endoplasmic reticulum membrane and the cell membrane are directly connected.

2. The endoplasmic reticulum membrane is directly connected to the cell membrane. The endoplasmic reticulum is the membrane system of the cytoplasm, which is connected to the cell membrane on the outside and the outer membrane of the nuclear membrane on the inside, organically connecting various structures in the cell into a whole, effectively increasing the membrane area in the cell, and having the role of chain defense to assume the transport of intracellular substances.

3. The cell membrane is mainly composed of lipids (mainly phospholipids), proteins and sugars; Among them, proteins and lipids are the main ones. Under the electron microscope, it can be divided into three layers, that is, there is an electron dense band with a thickness of about one shed on the inner and outer sides of the membrane;

4. There is a thick zona pellucida in the middle, and the total thickness is about about this structure is not only seen in various cell membranes, but also various organelle membranes in cells, such as mitochondria, endoplasmic reticulum, etc., also have similar structures.