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  • 非脊脊椎动物和弦 - 高级

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    Would you believe this eats its own brain ?
    ::你相信这会吃掉自己的大脑吗?

    This is a sea squirt, which is a . Many physical changes to the tunicate's body occur during metamorphosis into an adult; one of the most interesting changes involves the digestion of the cerebral ganglion, which controls movement and is the equivalent of the human brain. From this, the common saying that the sea squirt "eats its own brain" arises.
    ::这是一个海水喷口,它是一个。它的身体的许多物理变化发生在成人的变形过程中;最有趣的变化之一是大脑交织的消化,它控制着运动,相当于人类的大脑。从这一点上,人们常说海水喷口“吃自己的大脑 ” 。

    Characteristics and Classification of Nonvertebrate Chordates
    ::非脊脊脊椎和弦的特征和分类

    The phylum Chordata includes all vertebrates . These organisms are named because they have a notochord , a stiff but flexible rod of that runs the length of the body. The notochord provides resistance against which can contract, allowing the body to bend. In most chordates, the notochord is replaced by the backbone - but not in all chordates. This phylum also includes two groups that don't have backbones.
    ::phylum Chordata 包括所有脊椎动物。 这些生物的名字是因为它们有支部、 僵硬但灵活的棒, 其长度与身体长。 支部具有抵抗力, 使身体能够弯曲。 在大多数语系中, 代号由脊椎取代, 但不是所有语系。 此语中还包括两个没有脊椎的组 。

    The nonvertebrate in the phylum Chordata ( nonvertebrate chordates ) are exclusively organisms. They include the tunicates and the of the subphyla Urochordata and Cephalochordata respectively. Urochordates and cephalochordates are small organisms that are usually only a few centimeters in length, or about the size of your hand (or smaller). In addition to these two subphyla, there is also a class of Vertebrata, Myxini, that includes the hagfish (mentioned in additional concepts - see the Evolution concept), which lacks a backbone and is therefore technically a nonvertebrate class of chordates. This class represents an important bridge between nonvertebrate and vertebrate chordate species.
    ::phylum Chordata(非脊椎动物 Chordates)中的非脊椎动物(非脊椎动物)是独生生物,它们分别包括和亚脊椎动物(Urochordata)和Cephalochordata(Cephalochdates),乌鲁氏菌(Urochordates)是小生物,通常只有几厘米长,或大约你的手大小(或小于手大小)。除了这两个子植物外,还有一种Vertebrata, Myxini, 包括了(在其他概念中提及的 -- -- 见进化概念)的hagfish,它们缺乏脊椎动物,因此在技术上是非脊椎动物的染色体类别。这个类别代表了非脊椎动物和脊椎生物染色体物种之间的重要桥梁。

    Summary
    ::摘要

    • The tunicates and the lancelets, of the subphyla Urochordata and Cephalochordata respectively, are the two main nonvertebrate chordates.
      ::亚phila Urochordata 和 Cephalochordata 分别是两种主要的非脊椎染色体。

    Review
    ::回顾

    1. What is the notochord?
      ::代号是什么?
    2. What is the purpose of the notochord?
      ::代号的用意是什么?
    3. What are nonvertebrate chordates?
      ::什么是非脊椎染色体?
    4. What are the two main types of nonvertebrate chordates?
      ::非脊椎染色体的两个主要类型是什么?