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I am Lyosha [343]
3 years ago
14

A protective tissue that also secretes is ______________________ tissue.

Biology
1 answer:
kaheart [24]3 years ago
7 0
The skin, or integument
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A simple model that can help you understand the forces acting on an object is a(n)
gladu [14]

Answer:

In a free-body diagram, a box is used to represent the object, and arrows (the forces) are drawn outward from its sides.

Explanation:

Once you put all of this together, it's pretty simple to figure out which forces are acting on any given object.

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2 years ago
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The gene form of a trait is called a(n)
OLga [1]
I believe it’s a chromosome.
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3 years ago
Are viral infections curable? Why or why not?
Anna11 [10]

Answer:

no.

Explanation:

Viruses, on the other hand, are not cellular. We can't kill them simply by disrupting their cells. They are infective nucleic acids which cannot replicate outside of living cells. They must invade a human cell to reproduce, because they cannot produce energy or synthesize molecules on their own. Some viruses replicate inside human cells and then bud off from the human cell inside an "envelope" made from the human cell's own membrane, which helps them evade the immune system on their way to infecting another human cell. Many viruses are protected by protein capsids, which are extremely protective--unlike a bacterial cell wall or membrane, the virus doesn't have to be alive inside the capsid or exchange nutrients and waste with the environment across the capsid; the capsid is merely there to protect the nucleic acid of the virus.

Viruses need to match some sort of receptor in order to gain entry into human cells, and in some viruses, this receptor is one of the few good targets for drug therapy; however, unlike antibacterials, the drug will only work for that particular virus/receptor, because each virus uses a different receptor.

Viruses spend time inside human cells, which protects any outer antigens from some of the aspects of the immune system. There are times when viruses are especially vulnerable during replication, but there are reasons they are harder than bacteria to target with these antireplication drugs: 1) unlike for most bacteria, the drugs need to be small enough to enter the human cell where the virus is replicating, 2) unlike for most bacteria, the drugs can't simply target a protein shared by most viruses; furthermore, many viruses hijack human proteins which cannot be targeted. Overall, there are comparatively few antiviral drugs compared to antibiotics because of the huge difficulty in obtaining selective toxicity. And 3) most drugs available target a certain step of viral replication for a certain family of viruses; however, by the time the patient shows symptoms, the virus has already created countless copies of itself or become latent in human cells, and at that point it is too late for most of the antiviral drugs to be super helpful since they target the replication itself. Even when a good antiviral drug is developed, most of them work only against a single species (or at best, a family) of viruses, which is not the case for most antibiotics.

Many viruses don't spread in ways where they can easily targeted (Polio moves from the GI tract to lymph nodes and then to the blood stream on it's way to the spinal cord to cause paralysis; it is vulnerable to the immune system in vaccinated individuals while it is forced to travel in the blood. In contrast, some viruses like rabies, herpes, and varicella-zoster spread through neurons in order to evade the immune system. Other viruses form syncytia because they travel directly from cell to cell). Also remember that some viruses integrate themselves into human DNA and remain latent for long periods of time, which prevents them from being cleared by drugs or the immune system. The human immune system does have its ways of dealing with viruses, which I can get into in greater detail in another post. For certain viruses, the only way we have to treat them is to use interferons to ramp up the immune system (a very unpleasant therapy which must often be maintained for very long periods of time).

One of the reasons that vaccines for some viruses are not effective is that oftentimes, a live (attenuated) vaccine cannot be made for those certain viruses since the reversion mutation rate is too high to provide an acceptable risk; for many viruses, only killed strains can be used, if at all. Without a live attenuated virus strain multiplying inside cells, certain critical aspects of the immune system are not activated against these certain viruses. In cases where killed viruses are able to be used as vaccines, the protection is lesser (for instance, no type-switching to IgA antibodies which would be more effective than IgM) and shorter-lived.

7 0
2 years ago
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Long-term evolution between bats and moths can lead to coevolution. Coevolution occurs when two species evolve in response to th
Sonja [21]

In this case, the two species have coevolved by modifying behavioral traits (moths) and physiological traits (bats).

<h3>What is coevolution?</h3>

Coevolution is a particular type of evolution where a selective pressure imposed by one species serves to generate an adaptive change in another species and vice-versa.

Coevolution is fundamental in predator-prey relationships and leads to the emergence of new traits that are selected by natural selection.

In conclusion, the two species above have coevolved by modifying behavioral traits (moths) and physiological traits (bats).

Learn more about coevolution here:

brainly.com/question/1489642

#SPJ1

3 0
2 years ago
Describe your patient and the timeline up to their hospital visit.
mestny [16]

The question offers an image containing information regarding the patient by the name of Anita and her actions prior to arriving at the hospital.

We can describe the patient and her timeline up to her hospital visit by mentioning information about her:

  • <em>Name </em>
  • <em>Occupation</em>
  • <em>Weight</em>
  • <em>Age</em>
  • <em>Actions prior to her hospital visit</em>

The patient in question is a 108 pound, 36-year-old female by the name of Anita Martin. The patient is indicated to be a security guard. As per the information given, the patient seems to have been working a night shift in a building in the vicinity of a recent train wreck that seems to have released chlorine gas. On her way to her car, Anita was exposed to chlorine gas, due to which she decided to drive to the hospital.

With this information, we will have properly described the patient in question so that the medical professionals at the hospital will have all the information necessary to proceed with an effective treatment plan for Anita's condition.

To learn more visit:

brainly.com/question/138941?referrer=searchResults

3 0
2 years ago
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