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mrs_skeptik [129]
3 years ago
12

A radioactive isotope has half life of 10dsys. what is the time required for the activity of the isotope to fall to a 16th of it

's original value?​
Medicine
1 answer:
Romashka-Z-Leto [24]3 years ago
7 0
5 days for it to fall
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Your textbook discusses the neural pathways responsible for instinctual fear responses that occur when you perceive a threatenin
ss7ja [257]

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Thalamus to amygdala.

Explanation:

Neural pathway is the way by which signals are transmitted in the body from one region to another region. These neurons are connected by the bundle of axons or by the single axon.

The fear response and all the other response is directly or indirectly controlled by the nervous system. The fear response may take time because the information needs to travel from the thalamus region to the amygdala region of the brain.

Thus, the answer is thalamus to amygdala.

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The stress-relaxation effect occurs in all blood vessels but is most important in the arteries.
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Answer:

The best answer to the question: The stress-relaxation effect occurs in all blood vessels but is most important in the arteries, would be, B: False.

Explanation:

The reason for this being the correct answer comes from the function that both arteries and other blood vessels play and the significance of the process of stress-relaxation to the functionality of oxygenation, blood flow and pressure.

Stress-relaxation is the process by which the pressure within a specific tissue, in this case the blood vessels, does not increase as the volume of blood increases. Now, because arteries´ main job is not merely to conduct oxygenated blood from the heart towards the tissues of the body, it requires the presence not just of volume, but also of pressure, and usually, pressure in arteries is higher than the actual volume of blood. This is possible because of the high content of muscular tissue present in the middle layer of arteries. Without this high pressure, exchanges would not be possible. But veins, whose main purpose is to return all the de-oxygenated blood from the tissues to the heart, have the need to become reservoirs of large volumes of blood, and therefore have what is known as a high level of compliance (their muscular layer is not as powerful as that of arteries and the elastic tissues are more prominent, allowing the vessel to contain larger volumes of blood, but exert much lesser pressure). It is these blood vessels, veins, who show a high level of stress-relaxation, contain volume without affecting pressure, and not arteries, and that is why the answer is false.

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3 years ago
Antibiotics are routinely introduced into the food of cattle, chickens and other livestock, which causes the animals to grow fas
Rudik [331]

Answer:

Bacteria are highly adaptable microorganisms who have the capability of developing defense mechanisms against that which may harm them. Not least important of all, is the easiness with which some bacteria, especially pathogenic bacteria like Salmonella, or Klebsiella, develop mechanisms of resistance to antiseptics and, most importantly, antibiotics.

Antibiotics are a chemical substance that was created, and has been developed, in order to be able to combat pathogenic microorganisms, specifically bacteria. However, because today these substances are being used indiscriminately, we are now seeing a very worrying pattern of antibiotic-resistance patterns in microorganisms that used to be sensible to them. The result, we are facing strains of pathogenic bacteria, like Klebsiella pneumonia and E. Coli, that have become resistan to all types of antibiotics, from first generation, to fourth generation. And this has meant that when people acquire infection by these pathogens, the likelihood of death by them has increased because there are no agents capable of combating them.

Exposure to antibiotics has been the sole reason why these resistant strains of bacteria have emerged, especially when these antibiotics are not necessary. And feeding these substances to animals, to ensure their development and weight gain, has not made the situation any better. Now, we are instead adding also bacteria to the list that did not use to be resistant, but that are becoming so as they become adjusted to the constant exposure to antibiotics. Again, the result has been: more people infected with bacterial strains that cannot be combated with any of the existing antibiotic agents.

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