front 1 Once all organs system are present during gestation, the conceptus is then called a ________ | back 1 fetus |
front 2 Name the transport process by which oxygen, carbon dioxide, and nutrients cross the placenta | back 2 diffusion |
front 3 List the names of the three primary germ layers | back 3 ectoderm endoderm mesoderm |
front 4 Define implantation | back 4 attachment of blastocyst to lining of uterus |
front 5 A single-celled, fertilized egg is known as a _____ | back 5 zygote |
front 6 The ______ is a disc shaped organ embedded in the uterine wall. It provides nutrition to the fetus via the umbilical cord | back 6 placenta |
front 7 The period from fertilization through the 12th week is known as the _____ | back 7 first trimester |
front 8 Placental nutrition reaches the developing conceptus via a tube of blood vessels called the _____ _____ | back 8 umbilical cord |
front 9 The _____ and the ______ are two features of the fetal circulation that allow blood to bypass the non-functional lungs | back 9 ductus arteriosus and foramen ovale |
front 10 Name the outermost germ layer | back 10 ectoderm |
front 11 Name the stages of developing organism that occur during the preembryonic stage | back 11 zygote cleavage morula blastocyst |
front 12 All of the body's tissues originate from the tissues called ______ | back 12 primary germ layers |
front 13 List some structures that arise from the endoderm | back 13 digestive glands, epithelium of the digestive tract, and parathyroid gland |
front 14 List the functions of amniotic fluid | back 14 protect fetus from temperature fluctuations protect fetus from trauma allow development of the lungs |
front 15 The ______ performs respiratory, excretory, nutritional, endocrine, and immune functions of the fetus | back 15 placenta |
front 16 At the placenta, maternal blood is found within structures called _____ and fetal blood is found within | back 16 placental sinuses; chorionic villi |
front 17 The stage of _____ is complete when the blastomeres form three primary germ layers | back 17 embryogenesis |
front 18 List some structures that arise from the ectoderm | back 18 central nervous system, salivary glands, epidermis |
front 19 The ____ ______ arises from cells of the hypoblast. It contributes to the formation of the digestive tract and is the site of production of the first blood cells | back 19 yolk sac |
front 20 The _____ is the germ layer that will form the inner layer of the digestive tract | back 20 endoderm |
front 21 Indicate some of the structures that arise from the mesoderm | back 21 gonads, skeletal muscle, dermis |
front 22 In the developing fetus, blood from the umbilical vein bypasses the liver and empties directly into the vena cava by way of a vessel called the ductus ______ | back 22 venosus |
front 23 Fertilization occurs in the ______ of the female reproductive tract | back 23 distal one-third of the uterine tube |
front 24 The chorionic ______ are shaggy outgrowths of the chorion; they are involved in functioning of the placenta | back 24 villi |
front 25 Daughter cells formed by cell division following fertilization are called _____ | back 25 blastomeres |
front 26 Name the sac that encloses both the embryo and a fluid-filled space | back 26 amnion |
front 27 Indicate circulatory changes that occur just after birth | back 27 foramen ovale is closed by flaps in left atrium ductus arteriousus collapses |
front 28 The normal gestation period for a single (non-twin) baby is _____ weeks | back 28 40 |
front 29 The ____ are the organelles that contain genetic information, one from the sperm and one from the egg. These are present following fertilization but before mixing of sperm and egg chromosomes. | back 29 pronuclei |
front 30 Approximately 6 days after ejaculation, sperm are | back 30 no longer viable |
front 31 Indicate the three major processes that occur during the preembryonic stage of gestation | back 31 implantation, cleavage, embryogenesis |
front 32 Describe a morula | back 32 stage of conceptus development when it is a spherical structure with 16 or more cells |
front 33 Summarize the events of the second trimester | back 33 organs complete most development |
front 34 The process of _____ is the differentiation of the primary germ layers into organ and organ systems | back 34 organogenesis |
front 35 The ____ is the outermost embryonic membrane that encloses all of the other membranes and the embryo | back 35 chorion |
front 36 Name the term for cell division that occurs in the earliest stages of zygote development | back 36 cleavage |
front 37 Name the narrow space between embryoblast (inner cell mass) and the trophoblast during early embryogenesis | back 37 amniotic cavity |
front 38 The _____ stage begins 16 days post conception, after the three germ layers have developed | back 38 embryonic |