Question
During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?
✓
Answer
After implantation, uterus, chorionic villi and uterine tissue become interdigitated (physically fused) to form a structural and functional unit between the developing embryo and the maternal body called placenta.
Functions:
Functions:
- Placenta facilitates supply of oxygen and nutrients to the embryo.
- Removes carbon dioxide, waste material and excretory material produced by the embryo.
- Produces hCG/ hPL, estrogens and progestrogens.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Explain the development of a secondary oocyte (ovum) in a human female from the embryonic stage upto its ovulation. Name the hormones involved in this process.OR
When does oogenesis start in humans? Name the three hormones and their sources, linked with oogenesis. How do they influence the process of oogenesis? Explain.
When does oogenesis start in humans? Name the three hormones and their sources, linked with oogenesis. How do they influence the process of oogenesis? Explain.
Hypertension.
A true breeding pea plant homozygous for axial violet flowers is crossed with another pea plant with terminal white flowers (aavv).
List the Mendel’s generalisations that can be derived from the above cross.
List the Mendel’s generalisations that can be derived from the above cross.
Dryopithecus.
Heart failure.
If a desired gene is identified in an organism for some experiments, explain the process of the following:
- Cutting this desired gene at specific location.
- Synthesis of multiple copies of this desired gene.
Drugs and alcohol give short-term 'relief and long term 'damages'. Discuss.
Describe the respiratory disorders.
The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:
Specify the source of the hormone marked in the diagram.
Specify the source of the hormone marked in the diagram.
Absorption of water by roots from soil is with physical processes inhibition, diffusion and osmosis.