chapter 14 Flashcards
(148 cards)
define development
physiological, behavioural, cognitive, and social changes that occur throughout human life, which are guided by both genetic predispositions(nature) and by environmental influencers(nurture)
define infancy
development of stage that begins at birth and continues to one year of age
define childhood
periods between infancy and onset of puberty
define adoloscence
years b/w onset of puberty and the beginning of adulthood(emerging, early, middle and older adulthood)
define conception
occurs when an egg from mother is fertilized by a sperm from the other.
ovulation?
when an ovum or egg which has been stored in one of the mother’s two ovaries, matures and is released into fallopian tube
largest cell in the human body?
egg
zygote is a fertilized _____.
ovum
define zygote
within several hours of conceptions, half of the 23 chromosomes from the sperm fuse together, creating zygote
once the zygote attaches to the wall of uterus , it is known as _____-.
embryo
during which phase major internal and external organs are formed
embryonic phase, last for the next six weeks
inner layer of embryo forms _______ and outer layer forms _________.
embryo itself, surrounding protective environment that will help the embryo survive during pregnancy
what are the 3 major structures during embryonic stage
AMNIOTIC SAC
PLACENTA
UMBILICAL CORD
DEFINE AMNIOTIC SAC
fluid-filled reservoir in which the embryo(soon to be known as a fetus) will live until birth
functions of amniotic sac
-cushion against outside pressure
-temp regulator
_______ is an organ
that allows the exchange of nutrients between the embryo and the mother, while at the same time filtering out harmful material
placenta
_________links the embryo
directly to the placenta and transfers all material to the fetus.
umbilical cord
what two organs protect the fetus from many foreign agents?
placenta, amniotic sac
at what time ford embryo becomes a fetus after conception?
ninth week after conception
defining characteristic of the fetal stage
is.
growth
substances that can harm the fetus despite protection from placenta and umbilical cord are known as ____?
teratogens- general environmental factors, such as air pollution and radiation, but
also the cigarettes, alcohol, and drugs that the mother may use.
how does cigarette smoking affects the child?
reduces the blood
oxygen for both the mother and child and can cause a fetus to be born severely underweight
name the condition caused by maternal alcohol drinking that can lead to numerous detrimental developmental effects.
fetal alcohol syndrome (FAS)
name the detrimental developmental effects caused due to FAS
limb and facial abnormalities, genital anomalies, and intellectual disability.