The _ hypothalamus signals an animal to start eating, whereas the _ hypothalamus signals the animal to stop eating.

1 answer:

3 0

The lateral hypothalamus signals an animal to start eating, whereas the ventromedial hypothalamus signals the animal to stop eating. So the correct option is the first one.

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Answer:

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In discriminating between a viable and non-viable early intrauterine pregnancy, which one of the following criteria can be used

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Answer:

The correct answer in discriminating between a viable and non-viable early intrauterine pregnancy is B: "Mean gestational sac diameter of > 25 mm and no embryo".

Explanation:

There are different criteria used to discriminate between a viable and a non-viable early intrauterine pregnancy. The most often used to diagnose pregnancy failure are:

- Crown-rump length criterion: This is the absence of cardiac activity by the time the embryo has reached crown-rump length. A crown-rump length of 7 mm or more with no cardiac activity has been suggested by the latest studies to diagnose a non-viable pregnancy. There is a substantial likelihood that a crown-rump length < 7 mm can result in a false-positive diagnosis of pregnancy failure.

- Mean sac diameter criterion: This is the absence of embryo by the time the gestational sac has grown to a certain size. The gestational sac increases as the pregnancy progress. It has been suggested by the latest studies to use a mean sac diameter of 25 mm or more, and no visible embryo to diagnose failed pregnancy. A mean sac diameter of 16 to 24 mm and no embryo is suspicious for failed pregnancy, but shouldn’t be used to diagnose it.

- Time-based criteria: This is the absence of an embryo by a certain point in time. If an initial sonogram shows that there is a gestational sac and a yolk sac, but about 11 days later there isn’t any embryo with cardiac activity, then a failed pregnancy can be established. The timing event in early pregnancy is precise and reproducible to perform a correct diagnosis.

There are also suspicious findings that may help to identify a non-viable pregnancy. These are not certain and have not been extensively studied yet, so they cannot be used to reliably diagnose a pregnancy failure. A few of these findings are an empty amnion, a small gestational sac size, and the yolk sac size.

- Yolk sac: An enlarged yolk sac sized over 7 mm is suspicious for a failed pregnancy.

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A. True . Hope this helps you out

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Which of the following conditions leads to maximal expression of the lac operon?

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Lactose present, glucose absent.

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Lac operon may be defined as a cluster of genes that regulate the metabolism of lactose in bacteria. The bacteria always prefer glucose if both glucose and lactose is present in the medium.

The conditions that causes the maximal expression of lactose is the presence of lactose and absence of glucose. This is due to the action of catabolite activator protein and cyclicAMP.

Thus, the correct answer is option (1).

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The _____ hypothalamus signals an animal to start eating, whereas the _____ hypothalamus signals the animal to stop eating.

The _ hypothalamus signals an animal to start eating, whereas the _ hypothalamus signals the animal to stop eating.