Podcast
Questions and Answers
What is the name of the one-celled structure created when a sperm and egg merge?
What is the name of the one-celled structure created when a sperm and egg merge?
Zygote
During which stage does the zygote divide and multiply, going from one cell to two, then four, and so on?
During which stage does the zygote divide and multiply, going from one cell to two, then four, and so on?
Germinal stage
What is the process of cell division called?
What is the process of cell division called?
Mitosis
When does implantation occur?
When does implantation occur?
Signup and view all the answers
What is the name of the layer that eventually forms skin, nails, hair, brain, nervous tissue and cells, nose, sinuses, mouth, anus, tooth enamel, and other tissues?
What is the name of the layer that eventually forms skin, nails, hair, brain, nervous tissue and cells, nose, sinuses, mouth, anus, tooth enamel, and other tissues?
Signup and view all the answers
What is the name of the layer that develops into muscles, bones, heart tissue, lungs, reproductive organs, lymphatic tissue, and other tissues?
What is the name of the layer that develops into muscles, bones, heart tissue, lungs, reproductive organs, lymphatic tissue, and other tissues?
Signup and view all the answers
What is the name of the layer that forms the lining of the lungs, bladder, digestive tract, tongue, tonsils, and other organs?
What is the name of the layer that forms the lining of the lungs, bladder, digestive tract, tongue, tonsils, and other organs?
Signup and view all the answers
During which week does the heart begin to beat?
During which week does the heart begin to beat?
Signup and view all the answers
During which week does the fetus reach approximately 8 cm. (3.2 in.) in length and the head is approximately half the size of the fetus?
During which week does the fetus reach approximately 8 cm. (3.2 in.) in length and the head is approximately half the size of the fetus?
Signup and view all the answers
During which week does the fetus reach approximately 15 cm. (6 in.) in length?
During which week does the fetus reach approximately 15 cm. (6 in.) in length?
Signup and view all the answers
During which week does the fine hair called lanugo first develops on the head?
During which week does the fine hair called lanugo first develops on the head?
Signup and view all the answers
During which week does lanugo begin to cover all skin surfaces, and fat begins to develop under the skin?
During which week does lanugo begin to cover all skin surfaces, and fat begins to develop under the skin?
Signup and view all the answers
During which week does the hair grow longer on the head, and the eyebrows and eye lashes finish forming?
During which week does the hair grow longer on the head, and the eyebrows and eye lashes finish forming?
Signup and view all the answers
During which week does the fetus reach approximately 38 cm. (15 in.) in length and weighs approximately 1.2 kg (2 lb. 11 oz.)?
During which week does the fetus reach approximately 38 cm. (15 in.) in length and weighs approximately 1.2 kg (2 lb. 11 oz.)?
Signup and view all the answers
During which week does the fetus reach approximately 38-43 cm. (15-17 in.) in length and weighs approximately 2 kg (4 lb. 6 oz.)?
During which week does the fetus reach approximately 38-43 cm. (15-17 in.) in length and weighs approximately 2 kg (4 lb. 6 oz.)?
Signup and view all the answers
During which week does fat deposits become more pronounced under the skin?
During which week does fat deposits become more pronounced under the skin?
Signup and view all the answers
During which week do the lungs remain immature but breathing movements begin?
During which week do the lungs remain immature but breathing movements begin?
Signup and view all the answers
During which week does the fetus reach approximately 41-48 cm. (16-19 in.) in length and weighs 2.6-3.0 kg (5 lb. 12 oz. to 6 lb. 12 oz.)?
During which week does the fetus reach approximately 41-48 cm. (16-19 in.) in length and weighs 2.6-3.0 kg (5 lb. 12 oz. to 6 lb. 12 oz.)?
Signup and view all the answers
During which week are the lungs considered to be full-term?
During which week are the lungs considered to be full-term?
Signup and view all the answers
During which week does the fetus reach 48-53 cm. (19-21 in.) in length?
During which week does the fetus reach 48-53 cm. (19-21 in.) in length?
Signup and view all the answers
About 45% of pregnancies result in a miscarriage.
About 45% of pregnancies result in a miscarriage.
Signup and view all the answers
The zygote will die of starvation if it does not receive enough nourishment from the yolk.
The zygote will die of starvation if it does not receive enough nourishment from the yolk.
Signup and view all the answers
Implantation cannot occur if the uterine walls are not prepared in time to receive the zygote
Implantation cannot occur if the uterine walls are not prepared in time to receive the zygote
Signup and view all the answers
If the zygote becomes attached to a small fibroid tissue in the uterine wall or to the wall of the Fallopian tube, it can get nourishment and will survive.
If the zygote becomes attached to a small fibroid tissue in the uterine wall or to the wall of the Fallopian tube, it can get nourishment and will survive.
Signup and view all the answers
Unfavorable conditions in the prenatal environment are likely to occur between the tenth and eleventh week after conception.
Unfavorable conditions in the prenatal environment are likely to occur between the tenth and eleventh week after conception.
Signup and view all the answers
Maternal malnutrition, vitamin, and glandular deficiencies can cause developmental irregularities.
Maternal malnutrition, vitamin, and glandular deficiencies can cause developmental irregularities.
Signup and view all the answers
High blood pressure can increase the risk of preeclampsia in older women.
High blood pressure can increase the risk of preeclampsia in older women.
Signup and view all the answers
Exposure to radiation, pollutants, toxic wastes, and harmful substances such as cigarettes and alcohol can negatively impact prenatal development.
Exposure to radiation, pollutants, toxic wastes, and harmful substances such as cigarettes and alcohol can negatively impact prenatal development.
Signup and view all the answers
Taking harmful drugs such as antibiotics and some nonprescription drugs such as diet pills, aspirin, and coffee can negatively impact prenatal development.
Taking harmful drugs such as antibiotics and some nonprescription drugs such as diet pills, aspirin, and coffee can negatively impact prenatal development.
Signup and view all the answers
Taking nicotine, caffeine, and illegal drugs such as marijuana, cocaine, and heroin can negatively impact prenatal development.
Taking nicotine, caffeine, and illegal drugs such as marijuana, cocaine, and heroin can negatively impact prenatal development.
Signup and view all the answers
Rubella (German measles), syphilis, and genital herpes are all diseases that can negatively impact prenatal development.
Rubella (German measles), syphilis, and genital herpes are all diseases that can negatively impact prenatal development.
Signup and view all the answers
Study Notes
Prenatal Development
- Prenatal development is the process of a baby's development from a single cell after conception into an embryo and then a fetus.
- The average length is 38 weeks from conception.
- Development occurs in three stages: germinal, embryonic, and fetal.
Germinal Stage (Weeks 1-2)
- Conception occurs when a sperm fertilizes an egg, forming a zygote.
- The zygote rapidly divides through mitosis, becoming a two-cell, four-cell, etc. structure.
- Cells specialize forming different body parts.
- The zygote isn't yet attached to the uterine wall.
- Implantation occurs (11-15 days) when the blastocyst attaches to the uterine wall.
Embryonic Stage (Weeks 3-8)
- Begins after implantation.
- Cells continue to divide and differentiate into three germ layers: ectoderm, mesoderm, and endoderm, which form various tissues and organs (skin, nails, hair, brain, muscles, bones, heart, lungs, reproductive organs, digestive tract...).
- Key development includes the brain, heart, circulatory system, spinal cord, digestive system, bones, facial structures, and limbs.
- Key features appear progressively (eyes, nose, kidneys, lungs, hands, feet).
- First stages of heart beating and brain waves.
Fetal Stage (Weeks 9-40)
- Continued development and growth of existing structures.
- Body size and weight increase.
- Organs mature and refine functions.
- Hair, fingernails, and teeth develop, and bodily fat increases.
- By week 8, most major structures are present, and the fetus is able to move.
- Fetus is considered full-term at 38 weeks.
Fetal Stage Development (Weeks 9-40) Detail
- Weeks 9-12: Features like the face, neck, eyelids, limbs, digits, and genitals are well formed; teeth begin to develop; red blood cells are produced in the liver.
- Weeks 13-15: Fetus grows to 15cm (6 inches). Lanugo appears, and structures like lungs, sweat glands, muscles, bones are developed.
- Weeks 16-20: Fetus reaches 20cm (8 inches). Fat deposition begins; finger and toenails, eyebrows, eyelashes appear.
- Weeks 21-24: Fetus reaches 28.5cm (11.2 inches), hair grows longer; lungs and eyes develop.
- Weeks 25-28: Fetus reaches 38cm (15 inches), greater brain and nervous system development; controlled movements.
- Weeks 29-32: Fetus grows, gains control of movements, lungs develop for air breathing.
- Weeks 33-36: More fat deposits, lungs mature further, bones develop but not hardened.
- Weeks 37-40: Full term, ready for birth.
Prenatal Hazards
- Miscarriage (45% of pregnancies).
- Starvation, uterine preparation problems, faulty implantation locations causing death.
- Maternal malnutrition, vitamin, and glandular deficiencies.
- Problems from aging (e.g., high blood pressure).
- Exposure to harmful substances (radiation, pollutants, toxins, tobacco, alcohol, medications, illegal drugs).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge on the stages of prenatal development, including the germinal, embryonic, and fetal stages. Understand the key processes from conception to the formation of vital organs. This quiz is perfect for students studying developmental biology or prenatal health.
