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BIO204 Kazery Topic 23 Part 1
Terms in this set (60)
increase in size (from mitosis).
the process of change.
occurs in the uterine tube.
first increases the number of cells without changing the size of the zygote, and then begins to grow the baby.
A solid ball of cells called the _____ forms.
The morula forms a hollow ball of cells called the ______.
A cell mass that will develop into the embryo forms within the ________.
The ______ implants in the uterine wall.
digest the endometrium around the blastocyst.
Fingerlike processes from the blastocyst
penetrate into the endometrium.
lasts for about a week.
secretes hormones(hCG) to maintain the corpus luteum of the mother and to stimulate growth of the placenta.
2nd to 8th weeks
Development of the placenta and major internal and external body features occurs during the ___________.
becomes cylindrical and attaches to the placenta by a connecting stalk.
Chorionic villi (from the baby's chorionic membrane)
develop and are surrounded by spaces filled with maternal blood.
The inner cell mass
folds inward forming 2, then 3, layers.
gives rise to the nervous system, skin, lining of the mouth and anus.
gives rise to muscles, bones, blood vessels, lymphatic vessels, reproductive organs, kidneys, lining of body cavities.
gives rise to the linings of the digestive, respiratory, and urinary tracts.
develops a head, face, upper limbs, lower limbs, mouth. (It begins to take on a human appearance.)
The baby's part of the placenta
consists of the chorion and villi.
The mother's part of the placenta
consists of the uterine wall and attached villi.
O2 and nutrients
diffuse into the embryonic blood from the maternal blood
CO2 and wastes
diffuse from the embryonic blood into the maternal blood.
Chorion, Amnion, Allantois, Yolk sac
4 important membranes the embryo develops
A fluid-filled amnion
develops around the embryo.
The umbilical cord
forms as the amnion surrounds arteries and a vein.
The chorion and the amnion
A yolk sac
gives rise to blood cells and cells which later form sex cells.
extends from the yolk sac into the connecting stalk.
By the beginning of the ______ the embryo looks human.
8th week to birth
Existing structures grow and mature, few new structures develop.
8th week to birth
The body enlarges, the upper and lower limbs reach final proportions, the skin is covered with sebum and epidermis, the skeleton begins to ossify, muscles begin to contract, fat is deposited.
reaches full term around 266 days and should be about 50 cm long and weigh 6-8 pounds.
turns head downward preparing for birth.
Birth to end of 4th week (about a month)
The newborn must respire, obtain nutrients, excrete wastes, regulate body temperature for the first time.
The first breath
expands the lungs and clings to the ribcage.
cannot produce sufficient glucose from glycogen, so fat is used for energy.
don't concentrate urine yet, so dehydration is an issue.
Comprehensive homeostatic adjustments and Major circulatory system changes.
End of 4th week to one year
Rapid growth, Muscular and nervous systems mature, coordinated movement, Formal communication begins.
Proper proteins, vitamins, minerals are necessary as well as energy sources. (Nutrition)
End of first year to puberty
Rapid growth, Development of gross and fine motor skills
Establishment of bladder and bowel control
Puberty to adulthood
Physiological and anatomical changes resulting from reproductive functionality
Females may be taller and stronger than males in early ___________, but this is reversed by the end.
Highly developed motor skills, intellectual ability, emotional maturity
Adolescence to old age
Few changes in growth and development
After age 30, degenerative changes occur
Loss of muscle strength, Less efficient circulation, Loss of skin elasticity, Decline in sex cell production
Process of growing old
continues until body is incapable of coping with changes.
Caused by prolonged use, effects of disease, cellular alterations
usually results from mechanical disturbances in the circulatory system or from disease effects on major organs.
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