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miscarriage, pregnancy problems, and premature
birth. Prolactin increases after birth because progesterone
levels have declined and the inhibition of prolactin
secretion is removed. 4. Treating Female Infertility (page 223) Human Reproductive Technology (page 224)
1. Any three of: • Failure to achieve or maintain and erection • Abnormal ejaculation • Low sperm production • Poor sperm motility • Poor sperm survival • Vas deferens blocked or deformed. 2. Any three of: • Fallopian tubes blocked, damaged, or absent • Problems with ovulation (failure of eggs to mature or be released) • Abnormality or disorder of the uterus that prevents implantation or growth of
the embryo • Cervical mucus forms antibodies to the male’s sperm.
3. IVF: The female is given hormones to stimulate the
release of several eggs. The eggs are then removed
using a suction device and laparoscopy. The eggs are
mixed with sperm outside the body. Once fertilization
has occurred the egg is cultured to the 8- or 16-cell
(blastocyst) stage. It is then placed in the uterus for
implantation and further growth. 4. GIFT differs from IVF in that once the eggs are
mixed with sperm outside the body they are
placed immediately into the fallopian tubes where
fertilization occurs as normal (not in a test-tube
outside the body as in IVF). Biozone International 2009 Photocopying Prohibited 37
Birth and Lactation (page 225)
1. (a) Stage 1: Dilation: The time during which the
cervix is dilating (opening).
(b) Stage 2: Expulsion: The time between full
dilation and delivery during which the baby is
pushed to the vaginal entrance, the head crowns,
and the baby is pushed out.
(c) Stage 3: Placental stage: The delivery (passing
out) of the placenta. The placental blood vessels
constrict to stop bleeding. Growth and Development (page 227)
1. The size of the skull becomes proportionately much
smaller as an infant grows (birth to adulthood). 2. In the first period of rapid growth the face continues
to grow outwards, reducing the relative proportions
of the cran...
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This document was uploaded on 01/28/2014.
- Winter '13