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Chapter 36.3 (Growth and Aging (Adulthood (hair turning gray or white as…
Chapter 36.3
Growth and Aging
Infancy
By the end of the first year, the infant likely is walking and might be uttering a few words
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In the first year, a baby typically grows in length and weighs three times more than when the baby was born
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Stages of growth
Hormones, influence growth.
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Human growth hormone stimulates most areas of the body to grow as cells replicate by the process of mitosis
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Thyroxine from the thyroid increases the overall metabolic rate and is essential for growth to occur.
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Birth
Expulsion
. The mother consciously will contract her abdominal muscles to help push the baby, usually head first, through the vagina in the expulsion stage. When the baby is out of the mother’s body, the umbilical cord is clamped and cut. A small piece of the cord still attached to the baby soon will dry up and fall off, forming the navel, or belly button.
Placental
the placenta detaches from the uterus and leaves the mother’s body along with extraembryonic membranes.
There are some complications happen that prevents the baby from being born through the vagina. For cases like this, an incision is made through the mother's abdomen and uterus and the baby is removed from the mother's body. This process is called cesarean section.
Dilation
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dilation
or opening, of the cervix. The cervix must open to allow the baby to leave the uterus. Contractions of the uterus become stronger and more frequent, and at some point the amniotic sac tears. The amniotic fluid flows out of the vagina, which is sometimes described as the “water breaking.”
Done by: Reem Albrahim, Najla Ghamdi, Lama Assiri, Lama Alshuraihi
12C