Term
| what is the process which results in these cells specializing? |
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Definition
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Term
| what is the medical term for a fertilized egg? |
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Definition
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Term
| The approximately 100 trillion cells the make up the human body arise form what process of cell division that produces two genetically identical daughter cells? |
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Definition
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Term
| What scientific discipline focuses on the developmental events that take place between conception and birth? |
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Definition
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Term
| What is the 38 week period of development in the female reproductive system? |
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Definition
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Term
| What is the study of development during this period? |
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Definition
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Term
| What is the biological specialty that studies anatomical and physiological changes from the conception of a new individual to that individuals death? |
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Definition
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Term
| What are the three periods of develpment form the momoent of conception to birth? |
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Definition
Pre-Embryonic,
Embryonic,
Fetal Period |
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Term
| what are haploid cells which are capable of producing a new diploid individual? |
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Definition
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Term
| what are diplloid cells which are distinguished from the above cells? |
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Definition
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Term
| what is the distinguishing characteristic of human diploid cells? |
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Definition
| Has 23 pairs of chromosomes |
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Term
| what is the distinguishing characteristic of human haploid cells? |
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Definition
|
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Term
| what type of cell division produces haploid cells? |
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Definition
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Term
| What type of cell division functions in growth, cell replacement, and wound healing? |
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Definition
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Term
| How do these two types of cell division differ? |
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Definition
produces 2 types of daughter cells that are identical to the parent
Meiosis- produces daughter cells that are different to the parent |
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Term
| Where in the body does reduction division occur? |
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Definition
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Term
| why is reduction division important? |
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Definition
it remains the correct number of chromosomes
it produces varation |
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Term
| what is a fertalized egg? |
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Definition
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Term
| what period of development ranges from the moment of conception until the completion of implantation into the uterine wall? |
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Definition
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Term
| what process restores the diploid number of chromosomes determines the sex of the indidvual and initiates cleavage? |
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Definition
|
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Term
| what does fertalization usually take place? |
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Definition
| Widest part of the uterine tube the "ampulla" |
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Term
| What series of synchroized mitotic divisions results in an increase in the number of cells? |
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Definition
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Term
| What is the compacte 16-cell stage of development? |
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Definition
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Term
| In what stage do the products of conception enter the uterus? |
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Definition
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Term
| What stage of development occurs as fluids enter products of conception? |
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Definition
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Term
| What are the two distinct components of the fluid-filled sphere? |
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Definition
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Term
| Which of the two distinct components of the blastocyst becomes the embryo? |
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Definition
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Term
| What is the process by which the blastocyst burrows into and embeds within the endometrium? |
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Definition
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Term
| When does implantation begin? |
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Definition
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Term
| The inner cell mass (embryoblast) divides into two cell layers that form a flat disc. What is the anatomical term for this disc? |
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Definition
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Term
| What is the collective term for the membranes formed to mediate exchange between the uterus and embryo? |
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Definition
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Term
| which membrane forms first and is involved in the formation of blood cells and blood vessels? |
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Definition
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Term
| Which membrane forms a fluid filled sac immediately around the embryo? |
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Definition
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Term
| Which membrane is outermost and eventually forms the placenta? |
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Definition
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Term
| What is the organ of exchange between the mother and the embryo? |
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Definition
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Term
| What two layers of tissue contribute to its formation? |
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Definition
Chorion
Functional layer of Uterus |
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Term
| what structure intitally connects the embryo to the organ of exchange? |
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Definition
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Term
| What does the connecting stalk develope into? |
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Definition
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Term
| What stalklike structure form from the chorion? |
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Definition
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Term
| In the placenta do the mother's blood and the embryo's blood mix? |
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Definition
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|
Term
| What is the common name for the placenta? |
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Definition
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Term
| What process results in the formation of three primary germ layers? |
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Definition
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Term
| What are the three primary germ layers? |
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Definition
-ectoderm
-mesoderm
-endoderm |
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Term
| Using the definition of the authors of your text when does the blastocyst become an embryo? |
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Definition
| Once the three layers have formed, then the trilaminar structure may be called an embryo |
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Term
| The embryo is initially a flat disc, when does it begin to become a cylinder? |
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Definition
| late third-fourth weeks of development |
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Term
| What type of folding results in the formation of the head and buttocks? |
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Definition
|
|
Term
| what type of folding results in the formation of the torso? |
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Definition
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Term
| What structures form from the ectoderm? |
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Definition
| Nervous system tissue, epidermis of the skin, and epidermal derivatives such as hair and nails |
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Term
| What inductive action transfoms a portion of the ectoderm into a hollow tube which develops into the nervous system? |
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Definition
|
|
Term
| what structures form from the mesoderm? |
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Definition
| Dermis, Epithelial linings, muscle, connective tissue, adrenal cortex, dentin, heart, kidney, ureters, internal reproductive organs, spleen |
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Term
| What structures form the endoderm? |
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Definition
| Epithelial lining of the respiratory tract, GI tract, tympanic cavity, auditory tube, urinary bladder and urethra, most of the liver, gallbladder, pancreas, thymus, tonisls, portioins of parathyroid glands; thyroid glands |
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Term
| what is the process by which organs develop? |
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Definition
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Term
| What are substances that may cause birth defects? |
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Definition
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|
Term
| During what time period does the fetal period occur? |
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Definition
| Third month (9 weeks) to birth |
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