Question
The endoderm layer develops into ____.
Answer
The endoderm layer develops into digestive system, liver, and pancreas.
Rote Memory Note: Although there are no absolute rules for memorizing which tissues arise from which germ layer, certain guidelines can be followed for the MCAT®. The ectodermal cells develop into the outer coverings of the body, such as the outer layers of skin, nails, and tooth enamel, and into the cells of the nervous system and sense organs. The endodermal cells develop into the lining of the digestive tract, and into much of the liver and pancreas. The mesoderm develops into the structures that lie between the inner and outer coverings of the body: the muscle, bone, and the rest.
Mnemonic Note: The primary germ layers:
→ Ectoderm—“attracto”derm (things that attract us to others, such as cosmetic features and “smarts”)→ Mesoderm—“means”oderm (the means of getting around as an organism, such as bones and muscle; the means of getting around in the body, such as the circulatory system; the means of getting around, such as the gonads)
→ Endoderm—linings of “endernal” (internal) organs (the digestive and respiratory tract, and accessory organs attached to these systems)
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____ is the joining of a sperm and an ovum.
Fertilization is the joining of a ____.
Fertilization occurs in the ____ of the fallopian tube.
The sperm uses ____ enzymes to penetrate the corona radiata and zona pellucida.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the a____nd injects its pronucleus.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the acrosomal apparatus and injects its ____.