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IgorC [24]
3 years ago
10

When a person starts to run, the rate at which her muscles produce CO2 rises drastically. Soon, this increase in CO2 production

is balanced by an increased rate of CO2 removal as the runner breathes faster and her heartbeat increases. What type of feedback is this an example of?
a) negative feedback, because her body decreases the CO2 production
b) positive feedback, because the feedback had a beneficial effect on the body
c)negative feedback, because the body’s responses counteract the stressor
d) positive feedback, because it increased the amount of CO2 in the body
Biology
1 answer:
diamong [38]3 years ago
8 0

Answer:

c)negative feedback, because the body’s responses counteract the stressor

Explanation:

We know that during exercise or extreme physical activity, the energy requirements are not only met by aerobic respiration but also an-aerobic respiration in which glucose is converted into lactic acid along with CO2.

How negative feedback works:

In our body, the negative feedback mechanism works by adjusting the output of a process. Now, during exercise when there is an increased demand of oxygen in our body, the homeostatic set points of our body for blood pressure and heart rate are reset.

When CO2 is increased,it accumulates in the body and decreases pH, why? Because CO2 is acidic.

So, we know that our body needs pH  7.35 to 7.45 to perform all physiological processes normally. Therefore, during exercise, chemoreceptors of our body detect the pH change and send the signals to our brain for increasing the rate of respiration of lungs. So body, responds by increasing the breathing out of excess CO2 rapidly and the pH is maintained.

This is negative feedback and body's response to counteract the stress.


Hope it helps! :)

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Which of the following statements is true? A.)Tt and tt plants have the same phenotype. B.)A person with type O blood has two re
svetlana [45]

The correct answer is option B, that is, a person with type O blood has two recessive genes.  

An illustration of a trait determined by a single gene is blood type. Each human exhibits two copies of the gene for blood type on chromosome pair number 9. One of the copy is inherited from the father and the other one is inherited from the mother. An individual's blood type is determined by which allele he or she inherits from the parents.  

In case of blood type O, O is a recessive allele. If an A or B is inherited along with the O gene, the A or B gene decides the blood type of an individual. An individual is considered to have type O only if that person inherits two O genes, that is, a person with type O blood exhibits two recessive genes.  


3 0
4 years ago
The beta cells of the pancreatic islets secrete glucagon in response to low blood glucose levels.
sergejj [24]

Answer:

glucagon changes glycogen to glucose

Explanation:this happens when there is low glucose levels in the body.

6 0
3 years ago
If a single bacteriophage infects one E. coli cell present on a lawn of bacteria and, upon lysis, yields 175 viable viruses, how
iVinArrow [24]

Answer:

9.378*10^8

Explanation:

The number of phages in each cycle = 175

The number of host infected in each cycle = 175

The number of phages released by each hosts in each turn  = 175

There are total 4 cycle .

So the total number of phages that exist in a single plaque if 3 more lytic cycles occur

= 175*175*175*175\\= 175^4\\= 9.378*10^8

3 0
3 years ago
An enzyme is a _____ molecule.
sasho [114]
Answer should be D. Protein
8 0
3 years ago
Investigate four substances containing nitrogen or phosphorous that are related to biological processes, and explain their respe
OleMash [197]

Answer:

Well, you already have the answer, but I can try to elaborate XD

So, DNA: contains genetic information that is necessary for biological functioning and reproduction.

More specifically, it contains the genetic instructions through gene encoding that instructs the cell what to do. A specialized complex ribosome interacts with the DNA molecules and "reads" it, changing the genes from the DNA into proteins that the cell as a whole can function upon. It is also crucial to forming a whole cell in offspring, since only the genes from the two parents combined (in humans at least) can produce an offspring with all genes intact. Those who do not have genetic disorders, a famous one being Down Syndrome.

Next, RNA: a molecule necessary for expressing genes and making proteins.

Connecting to the paragraph above for DNA, RNA also assists in the process by reading the ribosome that reads the DNA itself. Complicated, I know. All you have to know, however, is that the RNA, in this case called mRNA since it serves as a messenger, hence, the "m", reads the codons produced by the ribosome when it reads the DNA, and makes proteins according to those codons, and those proteins then scatter all across the cell to execute instructions.

Now, we move onto nitrogen and phosphorous: both are found in amino acids, the building blocks of proteins.

That is actually partially wrong. Amino acids do not contain phosphorous, but do contain nitrogen. Not exactly sure what went wrong on your end there, but nitrogen is a basic building block for amino acids, which are basic building blocks themselves for proteins. To be more clear, amino acids are made of carbon, hydrogen, oxygen and nitrogen atoms. No phosphorus there!

Finally, enzymes: special proteins that accelerate chemical reactions in cells.

This is correct. Enzymes typically lower the activation energy required for reactions to happen. More specifically, enzymes make the reaction molecules more active, hence, lowering the threshold for the amount of energy you have to put in before the molecules start crashing into each other hard enough to have a chemical reaction. Of course, enzymes do not participate in the reaction itself, which makes them incredibly useful for spurring on chemical reactions since they can be used multiple times.

Explanation:

Hope this helped!

3 0
3 years ago
Read 2 more answers
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