UNIT FOUR TEST CH27

The majority of the liver, the gallbladder, and pancreas are formed by this germ layer.

This germ layer forms the majority of the nervous system and sense organs.

This germ layer forms the gonads, kidneys, and spleen of the developing embryo.

What connects the placenta to the fetus?

Which of the following vascular shunts connects the fetal left and right atria?

The placenta, a temporary organ that is shed after the infant is born, is the site of exchange of oxygen, nutrients, and waste between the mother and fetus.

The initial stimulus for labor comes from the:

Parturition is also known as:

A pregnant woman typically needs about 300 extra calories each day to support both herself and the fetus.

Which of the following is NOT a prenatal period?

The fusion of a sperm cell and secondary oocyte is known as:

The 16-cell stage is known as the:

In humans, from which extraembryonic membrane will the first blood cells arise?

Along which line of the embryo does the primitive streak form?

Which of the following is the inner germ layer?

What is the first major event of organogenesis?

By what week of prenatal development will the placenta be established?

Approximately how many days after fertilization is a fetus considered full-term and ready to be born?

Which fetal hormone initiates labor?

What major event occurs during the first stage of labor?

If two alleles code for the same trait (such as blond hair), they are said to be:

A birth defect known as spina bifida results from the incomplete closure of the embryonic neural tube. Which germ layer is affected?

A positive feedback mechanism initiates the rhythmic contractions of labor. Determine the hormones involved in this feedback loop.

Predict the possible blood types, or phenotypes, of offspring in which the father has blood type O and the mother has blood type AB.

What term refers to a conceptus implanting and growing in any location other than the endometrium of the uterus?

The conceptus forms rudimentary organ systems during the ________.

What hormone suppresses menstruation during pregnancy?

Which of the following terms describes the rapid mitotic divisions of a conceptus in the pre-embryonic period?

The growing offspring is generally referred to as the ___________.

Which of the following structures releases human chorionic gonadotropin (hCG)?

What results from the fertilization of a sperm cell and secondary oocyte?

Which of the following periods is not categorized as prenatal?

What hormone is detected in a pregnancy test?

Which of the following structures implants in, or attaches to, the endometrium of the uterus?

What stimulates the cortical reaction?

The 16-cell stage is known as the __________.

What process makes a sperm fully motile and modifies its plasma membrane so it can fuse with an oocyte?

The fusion of a sperm cell and secondary oocyte is known as __________.

During organogenesis exposure to which of the following substances can cause severe birth defects or even death?

What structure allows blood to move from the fetal pulmonary trunk directly into the aorta?

The region of the endometrium beneath the fetus

The stratum functionalis of the uterus

The region that envelops the embryo within the uterine cavity

Which of the following components of blood do not pass through the placental barrier between maternal and fetal blood supplies?

Which germ layer forms the pancreas and epithelium lining the digestive and respiratory tract?

What process is responsible for the formation of the three germ layers?

Which of the following is a depression between the left and right atria?

Which of the following structures is a remnant of fetal circulation that is present after birth?

Which germ layer forms the skeleton and most muscles?

What are the three primary brain vesicles?

Which germ layer forms the pancreas and epithelium lining the digestive and respiratory tract?

Which structure is not associated with the mesoderm?

Which region of a somite develops into the vertebrae and ribs?

During which month of prenatal development will the fetus begin to form blood cells in bone marrow?

During which month of prenatal development will ossification begin in most bones?

When a part or all of the placenta attaches to the inferior portion of the uterus, near or even covering the cervix, it results in __________.

Which germ layer forms the majority of the nervous system and sense organs?

The inner germ layer is the ________.

What process is responsible for the formation of the three germ layers?

Which germ layer forms the salivary glands, adrenal medulla, pituitary, and pineal glands?

During which month of prenatal development will the fetus begin to produce surfactant?

Which of the following structures is not associated with the mesoderm?