The process of organ development during the first two months of prenatal development is known as
- organogenesis.
- spermatogenesis.
- urogenesis.
- oogenesis.
Organogenesis: Organ formation that takes place during the first two months of prenatal development.
Which of the following is a small molecule that would be able to pass through the placental wall?
- a red blood cell
- carbon dioxide
- a hormone
- maternal wastes
Chronic Disorders: Disorders that are characterized by slow onset and long duration. They are rare in early adulthood, increase during middle adulthood, and become common in late adulthood.
The ________ is like a bag or envelope and contains a clear fluid in which the developing embryo floats.
- placenta
- umbilical cord
- amnion
- cervix
Amnion: The part of the prenatal life-support system that consists of a sac containing a clear fluid in which the developing embryo floats.
During the fourth week of prenatal development, the urogenital system becomes apparent, and ________ emerge.
- fingernails and toenails
- hair and eyelashes
- arm and leg buds
- eyes and eyelids
Embryonic Period: The period of prenatal development that occurs two to eight weeks after conception. During the embryonic period, the rate of cell differentiation intensifies, support systems for the cells form, and organs appear.
The ________ provides an environment that is temperature and humidity controlled, as well as shockproof.
- placental wall
- pericardial fluid
- umbilical cord
- amniotic fluid
Amnion: The part of the prenatal life-support system that consists of a sac containing a clear fluid in which the developing embryo floats.
Carla is three-and-a-half weeks pregnant. This indicates that her child is in the ________ period of prenatal development.
- embryonic
- fetal
- placental
- germinal
Embryonic Period: The period of prenatal development that occurs two to eight weeks after conception. During the embryonic period, the rate of cell differentiation intensifies, support systems for the cells form, and organs appear.
The structure that contains two arteries and one vein, and connects the developing embryo to the mother's body, is called the
- amnion.
- placenta.
- embryo.
- umbilical cord.
Umbilical Cord: Part of the prenatal life-support system that contains two arteries and one vein that connect the baby to the placenta.
The ________ consists of a group of tissues in which small blood vessels from the mother and the offspring intertwine but do not join.
- amnion
- placenta
- embryo
- umbilical cord
Placenta: A prenatal life-support system that consists of a disk-shaped group of tissues in which small blood vessels from the mother and offspring intertwine.
The life-support systems for the embryo include the
- umbilical cord, placenta, and amnion.
- circulatory, nervous, and digestive systems.
- digestive system, umbilical cord, and amnion.
- nervous system, digestive system, and umbilical cord.
Umbilical Cord: Part of the prenatal life-support system that contains two arteries and one vein that connect the baby to the placenta.
Which of the following statements is true of the layers of cells of an embryo?
- The mesoderm develops into the nervous system and brain, sensory receptors, and skin parts.
- The ectoderm primarily produces surface parts.
- The endoderm is composed of the mesoderm and the ectoderm.
- The mesoderm primarily produces internal body parts and sensory receptors.
The ________ is a layer of the embryo, which primarily produces parts that surround the internal areas.
- endoderm
- ectoderm
- mesoderm
- epidermis
Germinal Period: The period of prenatal development that takes place in the first two weeks after conception. It includes the creation of the zygote, continued cell division, and the attachment of the zygote to the uterine wall.
The attachment of the blastocyst to the uterine wall begins the ________ period of prenatal development.
- germinal
- embryonic
- fetal
- zygotic
Embryonic Period: The period of prenatal development that occurs two to eight weeks after conception. During the embryonic period, the rate of cell differentiation intensifies, support systems for the cells form, and organs appear.
Cell differentiation intensifies and organs appear in the ________ period of prenatal development.
- embryonic
- zygotic
- fetal
- germinal
In the period of prenatal development that occurs from two to eight weeks after conception, the blastocyst attaches to the uterine wall. During this period, the mass of cells is referred to as a(n)
- trophoblast.
- follicle.
- fetus.
- embryo.
Memory: A central feature of cognitive development, pertaining to all situations in which an individual retains information over time.
The ________ consists of three layers of cells: the endoderm, the mesoderm, and the ectoderm.
- blastocyst
- fetus
- embryo
- trophoblast
Memory: A central feature of cognitive development, pertaining to all situations in which an individual retains information over time.
Which of the following statements is true of the middle layer of the embryo?
- It will develop into the circulatory system, bones, muscles, excretory system, and reproductive system.
- It will develop into the nervous system and brain, sensory receptors, and skin parts.
- It primarily produces internal body parts.
- It primarily produces surface parts.
Organogenesis: Organ formation that takes place during the first two months of prenatal development.
The ________ prevents large molecules like red blood cells and harmful substances, such as most bacteria and maternal wastes, from entering the fetus.
- umbilical cord
- placental wall
- amniotic sheath
- ectoderm
Placenta: A prenatal life-support system that consists of a disk-shaped group of tissues in which small blood vessels from the mother and offspring intertwine.
The inner layer of cells of the embryo is referred to as the
- mesoderm.
- epidermis.
- endometrium.
- endoderm.
Gender: The characteristics of people as males or females.
The outermost layer of the embryo is called the
- mesoderm, which produces the digestive system.
- cytoderm, which produces the circulatory system.
- endoderm, which produces the reproductive system.
- ectoderm, which produces the nervous system.
The embryo's ________ develops into the digestive and respiratory systems.
- ectoderm
- endoderm
- trophoblast
- mesoderm
Gender: The characteristics of people as males or females.
Salma is trying to get pregnant and therefore visits her doctor to understand more about pregnancy and childbirth. She asks her doctor about the duration of the typical prenatal development. Which of the following would be her doctor's response?
- 38 to 40 weeks
- 24 to 30 weeks
- 28 to 33 weeks
- 20 to 28 weeks
Which of the following is the correct sequence of the periods of prenatal development?
- fertile; embryonic; postterm
- preterm; germinal; postterm
- gestational; germinal; postnatal
- germinal; embryonic; fetal