Podcast
Questions and Answers
During which trimester does the embryo transition to being called a fetus?
During which trimester does the embryo transition to being called a fetus?
- First Trimester (correct)
- The transition occurs before the first trimester.
- Second Trimester
- Third Trimester
What is the primary function of the waxy substance called vernix that covers the fetus's skin during the second trimester?
What is the primary function of the waxy substance called vernix that covers the fetus's skin during the second trimester?
- Hardening the bones.
- Facilitating rapid weight gain.
- Aiding in the maturation of the lungs.
- Protecting the skin. (correct)
Which of the following developments occurs during the second trimester?
Which of the following developments occurs during the second trimester?
- The respiratory system begins to form.
- The fetus gains the ability to hear and recognize the mother's voice. (correct)
- Formation of fingers and toes.
- Lungs fully mature.
What is the significance of the development of fat being created and deposited during the third trimester?
What is the significance of the development of fat being created and deposited during the third trimester?
During which stage of birth is the placenta expelled from the uterus?
During which stage of birth is the placenta expelled from the uterus?
What is the primary process occurring during the labor stage of birth?
What is the primary process occurring during the labor stage of birth?
Which of the following describes the delivery stage of birth?
Which of the following describes the delivery stage of birth?
What significant development typically occurs during the first month of the first trimester?
What significant development typically occurs during the first month of the first trimester?
What is the average length of a human pregnancy, divided into sections called trimesters?
What is the average length of a human pregnancy, divided into sections called trimesters?
During which month of pregnancy do all major organs typically form?
During which month of pregnancy do all major organs typically form?
What is the soft hair that covers the fetus during the second trimester called?
What is the soft hair that covers the fetus during the second trimester called?
Which function is NOT typically associated with the developments of the second trimester?
Which function is NOT typically associated with the developments of the second trimester?
During the third trimester, which of the following organs is the last to fully mature?
During the third trimester, which of the following organs is the last to fully mature?
What development occurs during the 2nd month of the first trimester?
What development occurs during the 2nd month of the first trimester?
What is a key indicator that the fetus can survive if born during the seventh month?
What is a key indicator that the fetus can survive if born during the seventh month?
Flashcards
What are trimesters?
What are trimesters?
Pregnancy is divided into three, 3-month periods.
The First Trimester
The First Trimester
The initial stage of development, characterized by rapid cell division.
What is a fetus?
What is a fetus?
The conceptus after the eighth week of gestation.
What is lanugo?
What is lanugo?
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What is vernix?
What is vernix?
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The Third Trimester
The Third Trimester
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What is Labor?
What is Labor?
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What is Delivery?
What is Delivery?
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What is Afterbirth?
What is Afterbirth?
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What happens in the first trimester?
What happens in the first trimester?
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What happens in the second trimester?
What happens in the second trimester?
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What happens in the third trimester?
What happens in the third trimester?
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Study Notes
- Fetal development, from a ball of cells to a baby, takes roughly nine months
- Pregnancy is divided into three-month trimesters
First Trimester (Months 1-3)
- Early on, the fetus is a small collection of cells
- The heart and nerves begin to form
- The respiratory system is forming
- Not all organs have been developed at this stage
- At one month
- By two months, the embryo is ½ inch long
- Muscles are developing
- Fingers, toes, and teeth are forming
- Squinting, swallowing, and tongue moving are visible
- By three months, the embryo is called a fetus
- All major organs have formed
- Fetuses begin dreaming
- Stretching, kicking and "womb-jumping" have begun
Second Trimester (Months 4-6)
- By four months, the fetus is 6 inches long
- The fetus is covered in soft hair called lanugo
- Hair, eyelashes, and fingerprints are present
- The fetus is very active and moves 50 times per hour
- By five months, the fetus now one pound
- Fetuses can hear and recognize the mother's voice
- Eyes are able to be opened slightly
- By six months, the skin is covered in a waxy layer called vernix
- Learning is constant
- Fetuses begin smiling, crying, scratching, and hiccupping
Third Trimester (Months 7-9)
- By seven months, the fetus weighs 2-4 lbs
- All major organs are maturing
- Fat is being created and deposited
- The fetus can now survive if born, but will be premature
- By eight months, rapid growth occurs where the fetus gains ½ lb per week
- Organs are now fully mature, except for the lungs
- There is rapid brain growth
- The fetus will start to turn head downward
- By nine months, most bones have hardened but the skull remains
- Shedding of hair and waxy vernix begins
- The lungs mature and are ready for birth
Birth
- After nine months, the fetus is ready to be born
- Birth takes place in three stages: labor, delivery, and afterbirth
Labour
- Strong muscle contractions of the uterus cause the cervix to enlarge
Delivery
- The fetus is pushed out of the uterus through the vagina and takes its first breath with its lungs
Afterbirth
- Final contractions push the placenta and other structures out of the uterus and vagina
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