16419514
Description
Flashcards by Rebecca Sikarev, updated more than 1 year ago
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Created by Rebecca Sikarev
over 6 years ago
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| Question | Answer |
| What are fraternal twins? | Siblings born at the same time with two different egg and sperm cells |
| What are identical twins? | Siblings developed from one fertilized egg cell that split into two embryos. |
| What is fertilization? | The fusion of a sperm and egg cell. The fertilized egg is called a zygote |
| Early development of Zygote | 1. Mitosis-cell division 2. Blatocyst: a hollow ball of cells 3.Implantation of blatocyst in uterine wall (1-2 weeks) 4. Differentiation of cells (weeks 3-4) 5. Gastrulation 6. Neurulation |
| What is gastrulation? | is the second phase of development and a migration of blastocyst cells inward, leading to multiple (3) distinct layers of tissue called germ cells |
| What is neurolation? | Develops the nervous system. Mesodermal tissue differentiates into the notochord. The neural tube forms spinal cord and brain Cells of neural crest become nerve cells, skin pigment cells, the lower jaw, etc. |
| What is the placenta? | the connection between mother and fetus |
| What does the embryo get through the placenta? | Oxygen, nutrients, and the placenta excretes its wastes |
| After 8 weeks what is an embryo called? What happens? | Its' called the fetus and organs start functioning |
| What happens at the end of a 3 month development? | Most of the major tissues and organs of the fetus are fully formed |
| What happens during later development (3 months- 9 months/birth)? | Tissues and organs become more complex and mature During the last 3 months the fetus grows in size and mass |
| Where do childbirth hormones come from? | Pituitary gland |
| What is one of them? | Oxytocin: causes the uterus to contract rhythmically (labor) until the baby is out Prolactin: stimulates production of breast milk |
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