Exam (elaborations)
DAT Developmental Biology Exam Questions and Answers 2024/2025( A+ GRADED 100% VERIFIED).
- Course
- Institution
DAT Developmental Biology Exam Questions and Answers 2024/2025( A+ GRADED 100% VERIFIED).
[Show more]
Seller
Follow
Content preview
DAT Developmental Biologyembryology - ANS study of the development of a unicellular zygote into a complete,
multicellular organism
early developmental stages - ANS fertilization, Cleavage
cleavage - ANS these divisions lead to an increase in cell number without a corresponding
growth in cell protoplasm. Thus cleavage results in progressively smaller cells with an
increasing ratio of nuclei to cytoplasm. it increase surface area- improving gas and nutrient
exchange
First complete cleavage of a zygote occurs approx. _____ the second ____ the third ___ - ANS
32 hours after fertilization the second occurs after 60 hours and the third is 72 hours at which
eight celled embryo reaches the uterus
morula - ANS solid all of embryonic cells
blastulation begins when - ANS morula develops a fluid- filled cavity call blastocoel, which by
the fourth day becomes a hollow sphere of cells blastula
blastula - ANS hollow sphere of cells, at this stage embryo that implants in the uterus.
emergency contraception - ANS works partially by inhibiting implantation of the blastula in the
uterus which is why it is most effective if taken within 72 hours of time of potential fertilization
normal pregnancy - ANS implant in the uterus, if outside of uterus most of the time it aborts
ectopic pregnancy - ANS embryo implant outside the uterus
Gastrulation - ANS after week 2 the embryo is fully implanted in the uterus and cell migration
transforms the single cell layer of the blastula into a three layer structure called a gastrula.
ectoderm - ANS integumentary system- epidermis, hair, nail, epithelium of nose, mouth- lens of
eyes, the retina, the nervous system.
endoderm - ANS epithelial lining of digestive tract and respiratory tracts and parts of liver,
pancreas, thyroid, and bladder lining
mesoderm - ANS musculoskeletal system, circulatory system, excretory system, gonads,
connective tissue throughout body, and portion of digestive and respiratory organs
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller KINGJAY. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53249 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now