What does it mean to absorb in living things?

In single-celled organisms and higher animals, the absorption process of nutrients is that substances and molecules cross the cell membrane into the cell, or then pass through the cell membrane on the other side to leave the cell and enter the tissue fluid or blood. With the evolution of organisms, the special absorption mechanism of specificity of different substances occupies a more important position. Taking the small intestinal absorption of mammals as an example, the general mechanism of absorption can be summarized as follows:

Pure diffusion. That is, the molecules of the substance enter the region of low concentration from the area of high concentration. The cell membrane is a lipid membrane between the intracellular fluid and the extracellular fluid, so only molecules of substances that are soluble in lipids are likely to diffuse from the high-concentration side of the membrane to the low-concentration side (also known as diffusion).

The absorption process by diffusion alone does not consume energy, and the molecules of the substance move according to the concentration gradient or potential gradient. Diffusion alone is not an important way for the small intestine to absorb nutrients. Facilitated diffusion.

With the assistance of specific protein molecules (carriers) in the cell membrane, the substance molecule passes through the diffusion process of the cell membrane, and this facilitated diffusion is the same as simple diffusion, which is also from the side with high concentration through the membrane and penetrates to the side with low concentration. The absorption of certain non-fat-soluble substances is carried out in this way. Facilitation diffusion does not require the consumption of metabolic energy.

Active transshipment. A substance that needs to consume energy for cellular metabolism can be transported through the membrane against the electrochemical gradient. For example, glucose and amino acids in the small intestine are actively transported against the concentration difference.

Endocytosis. Phylogeny is based on primitive food ingestion patterns. It is through the invagination of the cell membrane that surrounds the food particles or extends the pseudopodia to roll the food particles into the cell.

The small intestine can absorb some macromolecular substances and material agglomerates, such as intact proteins and triglycerides, by endocytosis.

It's like inhaling nutrients.

Meaning:

1. The object sucks certain substances from the outside world into the inside, such as sponge absorbing water, charcoal absorbing gas, etc.

2. It specifically refers to the body absorbing substances from the outside of the tissue into the tissue, such as the intestinal mucosa absorbing nutrients, and the roots of plants absorbing water and inorganic salts.

3. The object weakens or disappears certain phenomena and effects, such as spring absorbing vibration, soundproof paper absorbing sound, etc.

4. An organization or group accepts someone as a member: Join the party. Member.

Pinyin: [ xī shōu ].

Citation: Ai Wu, "The Southbound Journey Reprints the Inscription": "If the river does not absorb all kinds of flowing water, the river will dry up and lose the life of the river." ”

synonyms:1. Suck [xī qǔ].

absorption from it; Take: Lessons learned.

2. 取 [jí qǔ].

Absorb; Intake: Nutrition.

3. Luo Zhi [luó zhì].

Engage; Gathering (talents): Magi.

4. ingestion [shè qǔ].

Absorption (nutrients, etc.): Food. Oxygen.

5. Receive [jiē shōu].

Received: Contributions. Radio signals.

Absorption: 1. The object sucks some substances from the outside world inside, and the nutrients and water required by the normal human body are absorbed into the human body through the digestive tract 2. Acceptance; Acceptance 3, the process of the body ingesting nutrients from the environment into the body 4, the phenomenon of substances entering the medium phase from one medium phase to another. In physics is the process by which the energy of a photon is possessed by another object, usually an atom's electron, so that electromagnetic energy is converted into other forms, such as thermal energy.

The absorption of light during wave conduction is often referred to as attenuation. For example, the valence electrons of an atom are converted between two different energy levels, in which the photons are destroyed and the absorbed energy is released in the form of radiant or thermal energy. Although in some cases (usually in optics) the medium will change its transparency due to the intensity of the passing wave and the saturation absorption (or nonlinear absorption) that occurs it, in general, the absorption of the wave is independent of the intensity (linear absorption).

Absorption pronunciation: xī shōu

Definition of the word: Absorb the material from the outside to the inside: the sponge absorbs the water in the late potato hole The ink dripping on the paper is absorbed by the chalk.

Hand chop acceptance; Acceptance: Absorb new members, absorb the crowd, and merge into a large river.

Obtain beneficial ingredients: absorb the code to dry up the nutrients and absorb the advanced experience and new technology of foreign countries.

Notes: Ink:

1.Ink. 2.Writing with water of various colors.

3.Figurative learning or the ability to read and write.

Interior: 1Refers to a certain range.

2.Deep, not superficial.

3.Central. <>

Crowd: 1Numerous currents.

2.Refers to various schools of thought.

Foreign: 1In ancient times, it referred to regimes other than ****. The latter refers to a country other than one's own country.

2.Judah, a foreign land.

Moisture: 1Also known as "water".

2.The water contained in the object.

3.By extension, it refers to the superfluous or unreal part of a thing.

absorb [xī shōu].

Basic Definition. 1.The object sucks the external substance inside 2A detailed explanation of the weakening or disappearance of certain phenomena or effects by objects.

Absorb certain substances from the outside world inside.

Metaphorically ingesting beneficial ingredients.

synonyms: absorption, receiving, ingestion, absorption.

The breakdown products of substances pass through mucosal epithelial cells before they are digested in the digestive tract.

into the bloodstream and lymph. Food is digested in the digestive tract and eventually broken down into glucose.

Substances such as amino acids that can be absorbed by the body.

Absorption is a professional term in medical science, physics, and biology, which refers to the fact that an object sucks certain substances from the outside world into the inside; The process by which the body ingests nutrients from the environment into the body; The phenomenon of a substance moving from one medium phase to another.