1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ira Lisetskai [31]
3 years ago
7

Help pleaseeeee and please don’t waste my time by saying that ydk :) ty

Biology
2 answers:
Korvikt [17]3 years ago
8 0

Answer:

1. Arsenic, benzene, formaldehyde, lead, and mercury are just a few of the more than 70 cancer-causing chemicals in cigarette smoke.

2.They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.

3.Spirometry measures how much air you can breathe in and out. It also measures how fast you can empty the air out of your lungs. Spirometry helps diagnose breathing problems such as asthma and COPD.

4. Tar causes cancer of the lungs, mouth and throat.

sleet_krkn [62]3 years ago
7 0
Q1) Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia (1, 2, 5). Among the 250 known harmful chemicals in tobacco smoke, at least 69 can cause cancer.

Q2) The function of cilia is to move water relative to the cell in a regular movement of the cilia. This process can either result in the cell moving through the water, typical for many single-celled organisms, or in moving water and its contents across the surface of the cell.

Q3) Lung volume measurement can be done in two ways:
The most accurate way is called body plethysmography. You sit in a clear airtight box that looks like a phone booth. ...
Lung volume can also be measured when you breathe nitrogen or helium gas through a tube for a certain period of time.

Q4) Tar contains most of the cancer-causing and other harmful chemicals found in tobacco smoke. When tobacco smoke is inhaled, the tar can form a sticky layer on the inside of the lungs. This damages the lungs and may lead to lung cancer, emphysema, or other lung problems.
You might be interested in
Please help
leva [86]
I believe it that the answer is C. Hope this helps
3 0
2 years ago
Read 2 more answers
What does the theory of evolution contribute to conservation biology?
Studentka2010 [4]
The theory of evolution provides a number of insights:

-it tells us how the species are related
-it tells us how the species and populations react to the changes in their environment

With this knowledge, the scientists can predict how the species will react to the potential changes and support the positive changes (provide a good environment for the animals for example) <span />
6 0
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
Read 2 more answers
__________________________ is the process of mRNA carrying the instructions for protein synthesis for DNA.
kondaur [170]

Answer:

transcription

Explanation:

transcription is the process of transferring genetic Instructions from the DNA to mRNA if the necleus

7 0
3 years ago
Read 2 more answers
Which idea did Lamarck propose that was rejected by his fellow scientists?
NeX [460]
<span>A. Acquired traits can be passed to offspring Jean-Baptiste Lamarck first presented his Theory of Inheritance of Acquired Characteristics in 1801. According to his theory, if an organism changes in order to adapt to its environment, the changes are passed on the organism's offspring. Some of his proposed ideas in the theory, however, were dismissed by other scientists by experimenting and studying of genetics.</span>
8 0
3 years ago
Other questions:
  • What is responsible for the decreased stability of rna compared to dna?
    9·1 answer
  • What is the overall chemical reaction for photosynthesis? in which organelle does photosynthesis occur?
    13·1 answer
  • How can pollution be found in greater amounts at higher trophic levels compared to lower trophic levels
    13·2 answers
  • the middle of tectonic plates tend to have fewer mountains than locations near tectonic plate boundaries. What might be one poss
    11·2 answers
  • A/an ___________ occurs when a layer of warm air prevents the rising air from escaping. The polluted air is trapped and held clo
    8·1 answer
  • Which organelle is responsible for breaking down the cells that once made up the tail of a tadpole
    12·2 answers
  • What can you conclude about fossil by looking at the layers of rock?
    9·2 answers
  • Wich solution would most likely cause a plant placeres in it to become finer and more rigid
    9·1 answer
  • The altitude where the dewpoint equals the air temperature is called what?
    5·1 answer
  • what is the biological term of the Close Association between two organisms where one or both benefit​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!