Why do red blood cells enter the cell membrane instead of spreading red blood cells when they are pl

If you have hit the level of university knowledge, we say that it is due to the "difference in water potential". Water potential: It is caused by the different concentrations of the solution. The greater the concentration, the greater the water potential. Water will go from low to high (water flows to a high place, contrary to the usual saying).

If you're a high school level of knowledge, let's say it's due to the concentration of the solution. Water in a low-concentration solution penetrates into a high-concentration solution.

The concentration of the solution in red blood cells is high (the concentration maintained by various proteins, inorganic salts, sugars, vitamins, etc.), and the concentration of water itself can be considered to be zero, so water enters red blood cells. The end result is that the concentration on both sides of the red blood cell membrane is equal (this is not possible for clear water because it is always zero).

In other words, water enters the red blood cells without restriction, and eventually the red blood cells burst out, and finally the cells are finished. This is medically called hemolysis and is dangerous.

Cell spreading, as if it is a term in cancer, means that what was originally a mass of cells later spread out.

I don't know if it helps you.

There is a concentration difference between the inside and outside of the cell.

Red blood cell spread? LZ would like to talk about the diffusion of substances in red blood cells.

Because water can directly pass through the cell membrane or enter the cell through the water channel, while intracellular substances such as proteins, ions, etc. can neither directly pass through the membrane, nor do they have corresponding channels, so they cannot diffuse out.

It is precisely because the intracellular material cannot diffuse that the osmotic gradient inside and outside the cell is formed, and substances such as water, which can enter and exit the cell freely, can enter the cell.

The cell membrane can control the entry and exit of substances, but not water molecules. Cellular units are much larger than molecular units. In addition, the physical properties of clean water are stable, the melt is small, the intracellular melt is large, and the water content is relatively small, so the water will enter the red blood cells under the difference in physical properties, causing the cells to burst.

I've learned something from this biology...I also saw the bursting of red blood cells in lab class.

Water is a small molecule that enters the cell membrane is a passive transport, and the passive transport is carried by a low concentration to a high concentration of high intracellular concentration, and a low concentration of water will enter the cell.

Imagine that the fisherman netted the fish, the fish that came out of the net, and the water would flow out, and there would only be fish in the net, and when the net was put into the water, the water could pass through the net, and the net spread... And it is impossible for a fish to come out ...

Because the concentration of fluid in red blood cells is greater than that of water, there is a concentration difference, so water automatically enters red blood cells.

Why red blood cells do not have membrane organelles to osmotic action?

In animal cells, the cell membrane hail is equivalent to a semi-permeable membrane, so osmosis can occur. In plant cells, the outermost cell wall does not meet the requirements of osmosis because it is fully permeable. Therefore, in plant cells, the protoplasm layer plays the role of a semi-permeable membrane source.

Whereas, the protoplasmic layer includes the cell membrane, the vacuolar membrane, and the cytoplasm between the two membranes. Expanding on this, the requirements for infiltration are:1

with concentration differences; 2.With a semi-permeable membrane, in fact, it can be understood from the concept of osmosis, and the cell membrane is also a semi-permeable membrane. Because the plant cells can undergo osmotic action.

1."The ability of cells to absorb water"It is determined by the difference between the concentration of intracellular fluid and extracellular fluid;

The greater the concentration difference, the greater the water absorption capacity.

2. When extracting the cell membrane of red blood cells, it is broken by water absorption and centrifugation to obtain the blood shadow, that is, the cell membrane. In the process of water absorption, the concentration of the cell decreases, and the concentration of extracellular fluid does not suffocate, so that the concentration difference decreases, so the water absorption capacity decreases.

Answer]: The basic skeleton of the C cell membrane is the phospholipid bilayer, and the tail of the phospholipid molecule is hydrophobic and clumpy, so A is wrong. Human red cells belong to animal cells, and there is no large simple number vacuole like mature plant cells, so B is wrong.

Because the cell membrane is selectively permeable, it is correct to place it in distilled water because the external concentration is lower than the intracellular concentration, resulting in water absorption and breaking. When the temperature decreases, the fluidity of the cell membrane is weakened, so d is wrong.

2 layers of alveoli - 2 layers of blood vessel wall - 1 layer of red blood cells.

Because passing through a layer of lung stimulation bubble wall is passing through a layer of cells, you need to enter the cell once, out of the cell once, it is quite cautious to pass through the two layers of membranes, the same is true for the blood vessel wall, and finally the wide lead boy has to enter the red blood cells, so it is 2 + 2 + 1 = 5).

According to the analysis of the title: human red blood cells are immersed in NaCl solution with a concentration of X, and the red blood cells rupture, indicating the concentration of NaCl solution.

Less than the concentration of cell fluid in red blood cells, the cell absorbs water and ruptures; The human red blood cells were immersed in the NaCl solution with a concentration of y, and the red blood cells shriveled, indicating that the concentration of the NaCl solution was greater than the concentration of the cell fluid in the red blood cells, and the cells lost water and shrivelled Therefore, the concentration of these two NaCl solutions is x y It is known that the red blood cells of human beings are round cake-shaped.

The red blood cells in the red blood cells are round cake-shaped, indicating that the red blood cells are neither absorbed nor dehydrated, then the sucrose is in the B beaker.

The concentration of the solution is equal to the concentration of the fluid inside the red blood cells; If the red blood cells in the beaker shrink, indicating that the cells are losing water, the concentration of sucrose solution in the beaker is greater than the concentration of fluid in the red blood cells. The cells in the beaker changed from a round cake shape to a spherical shape, indicating that the cells absorbed water, and the concentration of sucrose solution in the beaker was lower than the concentration of liquid in red blood cells. According to the above analysis, the relationship between the concentration of sucrose solution in the four beakers is: C B B D A

Red, disassemble normal human erythrocytes into a solution of different concentrations (from .8％……solution), in the solution, some red blood cells begin to rupture, the chain tremor is reddish in the upper fluid, and when the red blood cells are in or lower NaCl solution, all red blood cells are ruptured.

Because the concentration in red blood cells is equivalent to the concentration of normal saline, and the concentration of water is small, so the red blood cells absorb water and break through the osmotic effect, and two solutions of different concentrations are separated by a semi-permeable membrane, and water molecules or other solvent molecules enter the high-concentration solution from the low-concentration solution through the semi-permeable membrane. or the phenomenon of water molecules moving from the side with high water potential through a semi-permeable membrane to the side with low water potential. If the vacuole of a plant cell is filled with an aqueous solution, and the vacuolar membrane and plasma membrane are regarded as semi-permeable membranes, osmosis occurs between cells, or between cells immersed in solution or water.

In fact, biofilms are not ideal semi-permeable membranes, they are selectively permeable membranes that allow both water molecules and certain solutes to pass through, but usually allow much more solvent molecules to pass through than solute molecules, so osmosis can occur. Due to the presence of the cell wall, plant cells can generate pressure to gradually equalize the water potential inside and outside the cell, and the cell stops osmotic water absorption. So plant cells generally do not break when placed in water.

Animal cells, such as red blood cells, burst when they are put in water

Red, normal human red blood cells are placed in different concentrations of solution (from the solution), in the solution, some red blood cells begin to rupture, that is, the upper fluid is reddish, when the red blood cells are in or lower NaCl solution, all red blood cells are ruptured.

Outside oxygen is first inhaled into the lungs and into the alveoli, which are thin and made up of a layer of cells. Sticking to the alveoli are the capillaries, which are also thin and made up of a layer of cells.

Therefore, oxygen first crosses the alveoli and passes through 1 layer of cells (2 layers of cell membranes). , then through the capillaries, through 1 layer of cells (2 layers of cell membrane), and then into red blood cells, through a layer of cell membrane, a total of 2 + 2 + 1 = 5 layers of cell membrane.