mezoderm

mezoderm

In animals with three tissue layers (i.e. all except sponges and cnidarians), the middle layer of tissue, between the ectoderm and the endoderm. In vertebrates, for instance, the mesoderm forms the skeleton, muscles, heart, spleen, and many other internal organs.

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posteljica

بيولوجيا; علم الحيوان

In mammals, a tissue formed within the uterus through which nutrients are passed from the mother to the embryo (and later the fetus) and its wastes are removed. It is analogous to ...

patologija

بيولوجيا; علم الحيوان

1. The study of disease and abnormalities. 2. The manifestation of a disease, injury, or abnormality, as in bone or eggshell for example.

bradavica

بيولوجيا; علم الحيوان

In eggshell, the cone-like structure at the base of the shell unit where the shell unit attaches to the inner organic membrane.

vilica

بيولوجيا; علم الحيوان

Often loosely applied to any movable, toothed structures at or near the mouth of an animal, such as the scolecodonts of annelids. In vertebrates, the jaw is derived from the first ...

crevo

بيولوجيا; علم الحيوان

The portion of the digestive tract between the stomach and anus; it is the region where most of the nutrients and absorbed.

egzoskelet

بيولوجيا; علم الحيوان

An external, often hard, covering or integument that provides support and protection to the body.

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Received Pronunciation (RP), also called the Queen's (or King's) English,[1] Oxford English,[2] or BBC English, is the accent of Standard English in ...