Match Each Term to Its Definition

question 113

Multiple Choice

Match each term to its definition.
-blastula

• A)fluid-filled cavity within the blastomere
• B)stage in which an embryo has three tissue layers
• C)solid ball of blastomeres
• D)opening that eventually becomes the anus
• E)process that involves an increase in number of cells, but not an increase in mass
• F)early stage in formation of the nervous system
• G)second stage of cleavage; a formed hollow cavity

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Definitions:

Endoderm

Innermost of the three germ layers of an embryo.

Epidermis

Outer portion of the skin formed of epithelial tissue that rests on or covers the dermis.

Germ Layer

One of the three primary layers (ectoderm, mesoderm, endoderm) in early embryonic development from which all tissues and organs develop.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of the skin, central and peripheral nervous systems, eyes, inner ear, and many connective tissues.