Terms in this set (26)
the fertilized egg; it enters a 2-week period of rapid cell division (clevages) and develops into an embryo from a unicellular zygote
the developing human organism from about 2 weeks after fertilization through the second month
rapid mitotic division right after fertilization that produces an embryo
The nutrient filled material that the embryos will rely on to complete their development
the union of a sperm and an egg
contains hydrolytic enzymes; a vesicle in the tip of a sperm, when the sperm approaches or contacts the egg.
A solid ball of cells that makes up an embryo; in humans, this stage occurs within four days of fertilization. 16-32 cells
the fluid-filled cavity inside a blastula
an egg that has been fertilized by more than one sperm.
In animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inward, producing a three-layered embryo, the gastrula.
Germ Layer: Endoderm
Innermost layer; Absorptive lining of the gut (digestive tract); digestive glands, lungs
Germ Layer: Mesoderm
Middle layer; Muscle, connective tissue, coelomic cavities, kidneys
Germ layers: Ectoderm
Outer layer; epidermis, nails, tooth enamel, nervous tissue
Innermost membranous sac surrounding the developing fetus; protects from mechanical shock and drying out
The yolk sac protects and segregates the yolk and is responsible for making the enclosed nutrients available to the developing embryo
acts as a uric acid disposal site for wastes produced as development proceeds
Works in conjunction with the allantois; acts as a gas exchange system through which O_2 can be provided for the developing zygote and CO2 can be released into the environment.
Underneath the shell
A fluid-filled sphere formed about 5 days after fertilization of an ovum that is made up of an outer ring of cells (trophoblast) and inner cell mass( embryoblast.)
outer cells of the blastocyst that secrete enzymes that allow implantation
programmed cell death
a specialized form of milk that delivers essential nutrients and antibodies in a form that the newborn can digest
a blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta
connects the umbilical vein to the inferior vena cava, bypassing the liver
connects the two atria in the fetal heart
In humans, the term for the developing organism between the embryonic stage and birth.
-microscopic fingerlike projections that penetrate the endometrium
-develop into the placenta & support maternal-fetal gas exchange
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