A&P II Pregnancy and Embryonic Development
36 flashcards covering A&P II Pregnancy and Embryonic Development for the ANATOMY-PHYSIOLOGY-2 A&P II Systems section.
Pregnancy and embryonic development is a critical topic in Anatomy and Physiology II, covering the physiological changes and stages of human development from conception through birth. This topic is outlined in the curriculum set by the American Association of Colleges of Nursing (AACN), emphasizing the importance of understanding the reproductive system, embryonic milestones, and maternal adaptations during pregnancy.
On practice exams and competency assessments, questions about this topic often involve multiple-choice formats that test knowledge of developmental stages, hormonal changes, and the impact of maternal health on fetal development. A common pitfall is overlooking the specific timelines of embryonic development, such as the significance of the first trimester, which can lead to confusion in answering questions about critical periods for organogenesis.
Clinicians often overlook the importance of preconception care and its influence on pregnancy outcomes, which can significantly affect both maternal and fetal health.
Terms (36)
- 01
What is the primary hormone responsible for maintaining pregnancy in the first trimester?
Progesterone is the primary hormone that maintains pregnancy during the first trimester by supporting the uterine lining and inhibiting uterine contractions (Marieb, Anatomy and Physiology).
- 02
How long does the embryonic period last during human development?
The embryonic period lasts from the third week to the eighth week of gestation, during which major organ systems begin to develop (Tortora, Anatomy and Physiology).
- 03
What is the role of the placenta during pregnancy?
The placenta facilitates nutrient and gas exchange between the mother and the fetus, acts as an endocrine organ, and provides immunological protection (Saladin, Anatomy and Physiology).
- 04
What is the maximum duration for a normal human pregnancy?
A normal human pregnancy typically lasts about 40 weeks, counted from the first day of the last menstrual period (Marieb, Anatomy and Physiology).
- 05
What is the first step in embryonic development after fertilization?
The first step is cleavage, which involves rapid mitotic divisions of the zygote to form a multicellular structure called a blastocyst (Tortora, Anatomy and Physiology).
- 06
During which week does the heart begin to beat in embryonic development?
The heart begins to beat around the fifth week of embryonic development, marking a critical milestone in fetal circulation (Saladin, Anatomy and Physiology).
- 07
What is the primary function of amniotic fluid during pregnancy?
Amniotic fluid cushions the developing fetus, allowing for movement and growth, and helps maintain a constant temperature (Marieb, Anatomy and Physiology).
- 08
Which structure forms from the inner cell mass of the blastocyst?
The inner cell mass of the blastocyst develops into the embryo itself, while the outer layer forms the placenta (Tortora, Anatomy and Physiology).
- 09
What is the significance of the neural tube during embryonic development?
The neural tube develops into the central nervous system, including the brain and spinal cord, and its proper formation is critical for fetal development (Saladin, Anatomy and Physiology).
- 10
How often should a pregnant woman receive prenatal check-ups?
Prenatal check-ups are typically recommended every month during the first 28 weeks, every two weeks from 28 to 36 weeks, and weekly thereafter until delivery (Marieb, Anatomy and Physiology).
- 11
What is the role of human chorionic gonadotropin (hCG) during early pregnancy?
hCG supports the corpus luteum, which produces progesterone necessary to maintain the uterine lining during early pregnancy (Tortora, Anatomy and Physiology).
- 12
What is the process by which the embryo implants into the uterine wall called?
The process is called implantation, which occurs approximately 6 to 10 days after fertilization (Saladin, Anatomy and Physiology).
- 13
Which organ is primarily responsible for nutrient and waste exchange between mother and fetus?
The placenta is the organ responsible for nutrient and waste exchange between the mother and the developing fetus (Marieb, Anatomy and Physiology).
- 14
What are teratogens, and how do they affect embryonic development?
Teratogens are substances that can cause congenital abnormalities during embryonic development, with effects depending on timing and exposure (Tortora, Anatomy and Physiology).
- 15
At what stage does the fetal period begin?
The fetal period begins at the ninth week of gestation and continues until birth, characterized by growth and maturation of tissues and organs (Saladin, Anatomy and Physiology).
- 16
What is the significance of the placenta's barrier function?
The placenta's barrier function protects the fetus from harmful substances while allowing essential nutrients and gases to pass through (Marieb, Anatomy and Physiology).
- 17
What is the main purpose of the umbilical cord during pregnancy?
The umbilical cord connects the fetus to the placenta, facilitating the transport of oxygen, nutrients, and waste products (Tortora, Anatomy and Physiology).
- 18
How does maternal blood volume change during pregnancy?
Maternal blood volume increases by approximately 30-50% to support the growing fetus and prepare for childbirth (Saladin, Anatomy and Physiology).
- 19
What is the role of relaxin during pregnancy?
Relaxin is a hormone that helps to relax the ligaments and soften the cervix in preparation for childbirth (Marieb, Anatomy and Physiology).
- 20
What is the embryonic stage of development characterized by?
The embryonic stage is characterized by the formation of major organ systems and structures, including the heart, brain, and limbs (Tortora, Anatomy and Physiology).
- 21
When does organogenesis occur during embryonic development?
Organogenesis occurs during the embryonic period, specifically from weeks 3 to 8, when organs begin to form (Saladin, Anatomy and Physiology).
- 22
What is the primary source of oxygen for the fetus before birth?
The primary source of oxygen for the fetus is the maternal blood, which is delivered through the placenta and umbilical cord (Marieb, Anatomy and Physiology).
- 23
What is the role of the yolk sac during early embryonic development?
The yolk sac provides early nourishment to the embryo and is involved in the formation of blood cells before the placenta is fully functional (Tortora, Anatomy and Physiology).
- 24
What are the three primary germ layers formed during gastrulation?
The three primary germ layers are ectoderm, mesoderm, and endoderm, which give rise to all tissues and organs in the body (Saladin, Anatomy and Physiology).
- 25
What is the significance of the fetal circulation system?
Fetal circulation is adapted to bypass non-functional lungs and liver, allowing oxygenated blood to flow from the placenta directly to the fetus (Marieb, Anatomy and Physiology).
- 26
How does the fetus receive nutrients during pregnancy?
The fetus receives nutrients through the placenta, which absorbs nutrients from maternal blood and transfers them via the umbilical cord (Tortora, Anatomy and Physiology).
- 27
What is the critical period for neural tube development?
The critical period for neural tube development occurs during the first month of pregnancy, highlighting the importance of folic acid (Saladin, Anatomy and Physiology).
- 28
What is the process of differentiation in embryonic development?
Differentiation is the process by which embryonic cells become specialized into various cell types and tissues (Marieb, Anatomy and Physiology).
- 29
What is the expected weight gain during a healthy pregnancy?
The expected weight gain during a healthy pregnancy typically ranges from 25 to 35 pounds, depending on the mother's pre-pregnancy weight (Tortora, Anatomy and Physiology).
- 30
What is the function of the foramen ovale in fetal circulation?
The foramen ovale allows blood to bypass the non-functioning fetal lungs by shunting blood from the right atrium to the left atrium (Saladin, Anatomy and Physiology).
- 31
What is the role of the ductus arteriosus in fetal circulation?
The ductus arteriosus connects the pulmonary artery to the aorta, allowing most of the blood to bypass the fetal lungs (Marieb, Anatomy and Physiology).
- 32
What is the importance of folic acid during pregnancy?
Folic acid is crucial for preventing neural tube defects and supporting overall fetal development (Tortora, Anatomy and Physiology).
- 33
What changes occur in the mother's body during pregnancy?
During pregnancy, the mother's body undergoes various changes including increased blood volume, hormonal shifts, and physical adaptations to support the growing fetus (Saladin, Anatomy and Physiology).
- 34
What is the significance of the fetal heart rate monitoring during pregnancy?
Fetal heart rate monitoring is important for assessing fetal well-being and detecting potential complications during pregnancy (Marieb, Anatomy and Physiology).
- 35
What is the role of the corpus luteum in early pregnancy?
The corpus luteum produces progesterone, which is essential for maintaining the uterine lining and supporting early pregnancy (Tortora, Anatomy and Physiology).
- 36
What is the typical duration of the second trimester of pregnancy?
The second trimester typically lasts from week 13 to week 26 of pregnancy, during which the fetus undergoes significant growth (Saladin, Anatomy and Physiology).