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Exam 4: Development

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Question 21

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Differentiation of the tissue of the embryo into the three primary germ layers begins _____ (before or after) implantation.

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Question 22

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The umbilical cord contains three blood vessels: two umbilical arteries and one umbilical vein.

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Question 23

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Cleavage

Place the following events in the correct order and briefly define each: embryonic development, implantation, fetal period, fertilization, labor, cleavage, placental development.

The _____ forms all skeletal and cardiac muscle tissue and most smooth muscle tissue.

Which of the following structures actually implants into the endometrium of the uterus?

Discuss the formation of both dizygotic (fraternal) and monozygotic (identical) twins.

The space indicated by the letter B is called the _____.

The letter D is pointing to the layer in which the _____ implants.

Bone formation begins during the _____ month of embryonic development.

The name for a fertilized ovum that contains one nucleus is a _____.

On the diagram, 1 is pointing to

The placenta has two distinct parts: the fetal portion formed by the _____ and the maternal portion formed by the _____.

The embryonic disc appears first as a bilayered structure of ectoderm and endoderm next to the amniotic cavity.

The region indicated by the letter E is the _____.

All major body systems have begun to develop by the end of _____.

Dizygotic (fraternal) twins result from

The morula enters the uterine cavity on day 4 or 5.

Which of the following is the most important event during the third week of development?

Place the following in the correct order: 1) aided by enzymes on their surface, sperm penetrate the cells of the corona radiata 2) acrosomal reactions are triggered when sperm bind to receptors in the zona pellucida 3) syngamy occurs when a sperm cell binds to receptors on the oocyte's plasma membrane 4) acrosomal enzymes from many sperm digest through the zona pellucida 5) zygote is formed