Biology Chapter 34B Q15

endometrium

the lining of the uterus

endometrium (2)

is well supplied with blood vessels that nourish the developing embryo

cervix

narrow lower end of the uterus

vagina

birth canal

vagina (2)

opens to outside the body

vagina (3)

allows entry of the sperm

vagina (4)

allows exit of the baby

menstrual cycle

a regular sequence of events involving the ovaries, endometrium, and endocrine system

menstrual cycle (2)

is regulated by hormones made by the hypothalamus, pituitary, and ovaries

menstrual cycle (3)

is controlled by feedback mechanisms

feedback mechanisms

occurs when an increase in a substance causes the mechanism that produces that substance to slow down production

menstrual cycle (4)

occurs, generally, within a 28-day time period

menstruation

if fertilization has not occurred, low levels of estrogens and progesterone cause the (endometrium) to detach from the uterine wall

menstruation (2)

the (endometrial) tissue, along with blood and the (unfertilized) egg, are discharged (through the vagina)

fertilization

the union of egg and sperm

fertilization (2)

occurs in the Fallopian tube

fertilization (3)

creates a zygote

zygote

the diploid cell that results from the union of the egg and sperm

implantation

occurs about 6-7 days after fertilization

implantation (2)

the developing embryo attaches to the wall of the uterus and begins to grow into the tissues of the mother

amnion

contains (amniotic) fluid which cushions and protects the embryo