chapter 18- development Flashcards
a solid ball of embryonic cells is called
morula
a fluid filled cavity is called
blastocoel
hallow sphere
bastua
what are the 4 extra embryonic membranes of the placenta and umbilical cord called
amnion, chorion, allanotis and yolk sac
of the extra embryonic membranes of the placenta and umbilical cord which one is a thin tough membrane consisting of watery fluid called amniotic sac
amnion
of the extra embryonic membranes of the placenta and umbilical cord which one completely surrounds the amnion and where placenta formation begins and assets with transfer of nutrients from mother to fetus
chorion
of the extra embryonic membranes of the placenta and umbilical cord which one develops as an out pocketing of the gut and its vessels connects the fetus to the mother
allantois
of the extra embryonic membranes of the placenta and umbilical cord which one is the site of early development of blood vessels and becomes associated with the umbilical vessels
yolk sac
what layer makes up the integumenty system, hair, nails, epithelium of the nose, mouth, anal cavity, lens of the eye, retina and nervous system
ectoderm
what layer makes up the musculoskeletal system, circulatory system, excretory system, gonads, connective tissue throughout the body and portions of the digestive and respiratory organs
mesoderm
what layer makes up the epithelial singing of the digestive and respiratory tract including the lungs, parts of the liver, pancreas, thyroid and bladder lining
ectoderm
what is the rod made of messier causes ectoderm to bend inward and forma groove along the dorsal surface of the embryo
notochord
what layer makes up the neural tube
dorsal ectoderm folds
what are the cells at the tip of the neural folds called
neural crest cells
in what trimester does the eyes gonads limbs liver cartilaginous skeleton turns to bone and embryo can be called a fetus
first
in what trimester does fingers toes elongate, face appears human and has tremendous growth
second
what trimester has rapid growth, and more growth of brain
third
what happens to the cervix during labor
thins and dilates
biological agents that cause congenital disorders
teratogens
what is double fertilization in angiosperms
one sperm fertilizes the egg and other the endosperm
do gymnosperms have endosperm
no
what is a sexual diploid stage called
sporophyte
what is a sexual haploid stage called
gametophyte
in seeds what part is the precursor of the upper stem and leaves
epicotyl
in seeds what part is the seed leaves; monocot or dicot
cotyledons
in seeds what part is the lower stem and root
hypocotyl
in seeds what part is feeds the embryo in angiosperm
endosperm
in seeds what part is develops from the outer covering of the ovule, the embryo and its seed coat together comprise the seed
seed coat
what type of cells cause cell elongation and differentiate into cells types characteristic of the species
meristem
what type of meristem is found at the tips of roots an stem
apical
which type of meristem is found between the xylem and phloem giving growth in diameter
lateral ( cambium)
