5 Written questions
5 Matching questions
- Neural crest cells
- Placental internal development
- a a structure in the pregnant uterus for nourishing a vivaparous fetus with the mother's blood supply; formed from the uterine lining and the embryonic membranes
- b each embryonic development is characterized by a series of rapid mitotic divisions knows as cleavage; these divisions lead to an increase in cell number without a corresponding growth in cell protoplasm (i.e., the total volume of cytoplasm remains constant); thus, cleavage results in progressively smaller cells, with an increasing ratio of nuclear-to-cytoplasmic material; cleavage also increases the surface-to-volum ration of each cell, thereby improving gas and nutrient exchange; this early developmental process consists of a series of very rapid, synchronous mitotic divisions that converts the zygote's single large cell into a solid ball of cells, known as teh morula, then into the blastula
- c in vertebrates, groups of cells along the sides of the neural tube where it pinches off from the ectoderm; the cells migrate to various parts of teh embryo and form pigment cells in the skin and parts of the skull, teeth, adrenal glands, and peripheral nervous system
- d the growing fetus receives oxygen directly from its mother through a specialized cirulatory system; this system not only supplies oxygen and nutrients to the fetus but removes carbon dioxide and metabolic wastes as well; the two components of this system are the placentaa and the umbilical cord, which both develop in teh first few weeks after fertilization
- e bleeding or the abnormal flow of blood
5 Multiple choice questions
- a developing human from the 9th week of gestation until birth; has all the major structures of an adult
- the middle primary germ layer in an animal embryo; develops into the notochord, the lining of the coelom, muscle, skeleton, gonads, kidneys, and most of the circulatory system in species that have thses structures
- the organs increase in size, which is a continual process from infancy to childhood to adulthood
- a hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals
- follows the neurulation process; includes organogenesis, growth, and gametogenesis
5 True/False questions
Blastocoel → a hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals
Indeterminate cleavage → after the intitial cell division the fate of the resulting daughter cells is determined -- they can only develop into specific tissues, not the whole organisms.
Ectopic pregnancy → the outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lense of the eye
Placenta and Umbilical cord formation → The cord that connects the developing embryo or fetus with the placenta and through which run the umbilical arteries and vein. The matrix (the substance) of the umbilical cord is known as Wharton's jelly and is a rich source of stem cells. At birth the umbilical cord measures about 20 inches (50 cm) in length. The cord is clamped and cut after birth and its residual tip forms the umbilicus (bellybutton).
Determinate cleavage → after the intitial cell division the fate of the resulting daughter cells is determined -- they can only develop into specific tissues, not the whole organisms.