牙髓炎

根尖周炎

死髓牙

牙周炎

残根

Extracellular matrix is the place where the extracellular fluid can be found.

It transmits information in the form of chemical messengers to the cells.

It consists of a mixture of protein molecules which is similar for any tissue.

The proteins of the extracellular matrix consist of fibers and a mixture of other proteins.

In connective tissues, extracellular matrix is abundant and carries the mechanical load. In other tissues, such as epithelia, extracellular matrix is sparse, and the cells are directly joined to one another and carry the mechanical load themselves.

Animal connective tissues are enormously varied. They can be tough and flexible like tendons or the dermis of the skin; hard and dense like bone; resilient and shock-absorbing like cartilage; or soft and transparent like the jelly that fills the interior of the eye. In all these examples, the bulk of the tissue is occupied by extracellular matrix, and the cells that produce the matrix are scattered within it like raisins in a pudding; the tensile strength—whether great or small—is chiefly provided not by a polysaccharide, as it is in the cell wall of plants, but by fibrous proteins, principally collagens.

The various types of connective tissues owe their specific characters to the type of collagen that they contain, to its quantity, and, most importantly, to the other molecules that are interwoven with it in varying proportions.

These other molecules include the rubbery protein elastin, which gives the walls of arteries their resilience as blood pulses through them, as well as a host of specialized polysaccharide molecules.

Never mind.

Yes, please.

Of course not.

You’d better not.

不能被唤醒

回答问话含糊

大小便失禁

角膜反射消失

肺癌

冠心病

高血压

肺炎

以上都不是

E

可与心肌β1受体结合产生正性作用

可与血管平滑肌α受体结合

可与血管平滑肌β2受体结合

与α受体结合能力明显强于β2受体

可来源于肾上腺髓质

不能被唤醒

不能回答问话

回答问话含糊

角膜反射消失

大小便失禁