chapter 22: development
Card Set Information
chapter 22: development
Bio Nett Chapter Development
Lecture notes for chapter 22: development
the length of a human pregnancy is generally 40 weeks. this is known as the _______ ________.
there are two parts to human development, what are their names?
______ is when cells become specialized in structure and function
______ is when body parts take on a certain shape or form
what are the five classes of higher animals?
what are the four developmental stages
which two developmental stages can be described as having cell division without growth?
cleavage and blastula
a human blastula has an inner cell mass that is described as totipotent. what does that mean
the mass can develop into a total and complete human being
monozygotic twins are
dizygotic twins are
in the gastrula stage cells push or invaginate into the
the primitive gut is formed during the gastrula stage. what is another name for the primitive gut
another name for the blastopore is
there are three tissue layers called the _____ layers
what are the three germ layers
endoderm, mesoderm, ectoderm
the first system to develop is
the nervous system
______ is the epidermis of skin, epithelial lining of oral cavity and rectum; nervous system
_______ is the skeletal, muscular, circulatory, excretory and reproductive systems and the dermis of skin
________ is the epithelial lining of digestive and respiratory tracts; urinary bladder
what is the order of germ layers from inside ---> out
what does the notochord develop into?
the vertebral column or backbone
neurulation occurs by _____
what are the three substages of the neurula stage?
neural plate stage
neural groove stage
neural tube stage
how do cells become specialized?
what is the first site of blood cell formation
gas exchange happens here
collects and stores waste (bulk of umbilical cord)
provides nutrients (first site of blood cell formation)
watery like substance that protects the embryo
the first and second month of human development is known as
the third thru ninth month of human development is known as
an egg is fertalized in the upper 1/3 of the
implantation in the wall of the _____ begins at the end of the first week
____ begins to develop in the first week of embryonic development. it aids in the implantation of embryo and forms the fetal portion of the placenta
fetal circulation is different from adult circulation. what is different
umbilical areteries and vein
heart to lungs
heart to body systems
what are the three methods of genetic defect testing before birth
chorionic villi sampling
what are the three stages of giving birth
dialation of cervix
infant is born
afterbirth (placenta) is expelled