Ques:Q: How is blood supplied from the mother to the fetus? Read this paragraph and choose the correct option from the provided answers: Hemoglobin of the Fetus The fetus has its own circulation with its own erythrocytes; however, it is dependent on the mother for oxygen. Blood is supplied to the fetus by way of the umbilical cord, which is connected to the placenta and separated from maternal blood by the chorion. The mechanism of gas exchange at the chorion is similar to gas exchange at the respiratory membrane. However, the partial pressure of oxygen is lower in the maternal blood in the placenta, at about 35 to 50 mm Hg, than it is in maternal arterial blood. The difference in partial pressures between maternal and fetal blood is not large, as the partial pressure of oxygen in fetal blood at the placenta is about 20 mm Hg. Therefore, there is not as much diffusion of oxygen into the fetal blood supply. The fetus' hemoglobin overcomes this problem by having a greater affinity for oxygen than maternal hemoglobin (Figure 22.27). Both fetal and adult hemoglobin have four subunits, but two of the subunits of fetal hemoglobin have a different structure that causes fetal hemoglobin to have a greater affinity for oxygen than does adult hemoglobin. Choices: - brain stem - vagina - spinal cord - umbilical cord A:

Ans:umbilical cord
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Ques:Q: What is the inner cell mass formed by the cells of the blastocyst called? Read this paragraph and choose the correct option from the provided answers: The cells of the blastocyst form an inner cell mass and an outer cell layer, as shown in Figure below . The inner cell mass is called the embryoblast . These cells will soon develop into an embryo. The outer cell layer is called the trophoblast . These cells will develop into other structures needed to support and nourish the embryo. Choices: - xerophyte - amniotic cavity - ectoderm - embryoblast A:

Ans:embryoblast
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Ques:Q: "cardio" has become slang for what type of exercise that raises your heart rate for an extended amount of time? Read this paragraph and choose the correct option from the provided answers: "Cardio" has become slang for aerobic exercise that raises your heart rate for an extended amount of time. Cardio can include biking, running, or swimming. Can you guess one of the main organs of the cardiovascular system? Yes, your heart. Choices: - cyclical - kinetic - anaerobic - aerobic A:

Ans:aerobic
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Ques:Q: What type of device uses electromagnetic induction to change the voltage of electric current? Read this paragraph and choose the correct option from the provided answers: An electric transformer is a device that uses electromagnetic induction to change the voltage of electric current. Electromagnetic induction is the process of generating current with a magnetic field. It occurs when a magnetic field and electric conductor, such as a coil of wire, move relative to one another. A transformer may either increase or decrease voltage. You can see the basic components of an electric transformer in the Figure below . For an animation showing how a transformer works, go to this URL: http://www. youtube. com/watch?v=VucsoEhB0NA . Choices: - radioactive transformer - hot transformer - mechanical transformer - electronic transformer A:

Ans:
electronic transformer
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