L12 Human embryology and development
8 important questions on L12 Human embryology and development
Bendig of the tubular heart
The extra embryonic membranes
Of what two structures is the umbilical cord formed?
The folding of the embryo and expansion of the amniotic cavity bring the connecting stalk and yolk sac together to form the umbilical cord.
As the amnion continues to grow, a layer of amniotic membrane gradually encloses the umbilical cord.
The basic circulatory system in a 20 day old human
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The umbilical cord, what's it function?
- Transports oxygen and nutrients to fetes from the placenta and returns waste products from the foetus to the placenta.
- contains:
- 2 arteries and 1 vein supported by mucoid material (Wharton's jelly) to prevent kinking and knotting
- Contains no pain receptors
Via what structure does Deoxygenated blood leave the fetus? And via what does oxygenated blood enter?
For or of what are human placenta a good source? For what else can they be used?
What are two important functions of the placenta?
- diffusion
- active transport
- pinocytosis
- membrane breakthrough
Endocrine function:
- human chorionic gandotropin (HCG)
- chorionic somatomammotropin (placental lactogen)
- chorionic thyrotropin
- chorionic corticotropin
- progesteron
- estrogen (in concert with the adrenal gland and liver (special enzymes))
What are the four extra embryonic tissues?
- Yolk sac
- Amnion
- Allantois
- Placental complex
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