Animal Reproduction

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Questions and Answers

In placental mammals, where does the embryo develop fully?

mother's uterus

What is the process called when the zygote undergoes a series of cell divisions?

cleavage

What does the implanted embryo secrete during the first trimester?

human chorionic gonadotropin (hCG)

What is the outer layer of the blastocyst called?

<p>trophoblast</p> Signup and view all the answers

What is the main function of the placenta?

<p>transport nutrients, respiratory gases, and wastes between the foetus and the mother</p> Signup and view all the answers

How are materials exchanged between the foetal capillary bed and the maternal blood pools?

<p>diffusion, active transport, and selective absorption</p> Signup and view all the answers

What is the hormone that maintains the pregnancy?

<p>progesterone</p> Signup and view all the answers

What happens during organogenesis?

<p>the embryo develops into an embryo and the heart begins to beat</p> Signup and view all the answers

What happens during the second trimester in relation to hormone levels?

<p>Hormone levels stabilize as hCG secretion declines and the placenta takes over the production of progesterone</p> Signup and view all the answers

What is the role of human chorionic gonadotropin (hCG) during the first trimester?

<p>hCG maintains the secretion of progesterone and oestrogens by the corpus luteum through the first few months of pregnancy.</p> Signup and view all the answers

How does the trophoblast contribute to the formation of the placenta?

<p>The trophoblast grows outwards and mingles with the endometrium, eventually helping form the placenta.</p> Signup and view all the answers

What are the three methods of material exchange between the foetal capillary bed and the maternal blood pools?

<p>Materials are exchanged by diffusion, active transport, and selective absorption.</p> Signup and view all the answers

What is the process called when the blastocyst develops into an embryo and goes through organogenesis?

<p>It is called embryonic development.</p> Signup and view all the answers

When does the zygote obtain nutrients directly from the endometrium?

<p>During its first 2-4 weeks of development.</p> Signup and view all the answers

What takes over the production of progesterone during the second trimester?

<p>The placenta.</p> Signup and view all the answers

What is the role of progesterone in maintaining the pregnancy?

<p>Progesterone maintains the pregnancy.</p> Signup and view all the answers

What is the main function of the placenta?

<p>The placenta transports nutrients, respiratory gases, and wastes between the embryo or foetus and the mother.</p> Signup and view all the answers

What is the name of the process when the zygote undergoes a series of cell divisions?

<p>The process is called cleavage.</p> Signup and view all the answers

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