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
natka813 [3]
2 years ago
5

On a backpacking trip, Kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 Calories. At the school tra

ck, Janelle runs the 100-meter sprint in 13.5 seconds, burning 10 Calories. Afterward, Janelle’s leg muscles are aching and she is breathing hard, while Kenny maintains normal breathing all day, even though he burns 400 times more calories than Janelle. Which two statements offer the BEST explanation for this phenomenon? A. If the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." B. Aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." C. After about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce ATP, resulting in "oxygen debt." D. The rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.
Biology
1 answer:
emmasim [6.3K]2 years ago
5 0

Answer:

A. If the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt."

D. The rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.

Explanation:

It is important to consider that Kenny hikes all day but at a steady pace, whereas Janelle runs very fast. So Kenny's case, the supply of oxygen is sufficient to maintain aerobic respiration within the muscle cells. During this process only CO2, Water, and ATP are produced; therefore, there is no oxygen debt. We should keep in mind that the body shifts to anaerobic metabolism only when the supply of oxygen is limited.

In Janelle's case, running fast would need energy at higher rates and the supply of oxygen would not be sufficient to generate a high amount of ATPs. Therefore, to compensate for this deficiency, cells will start fermenting glucose to lactic acid and produce ATP and maintain energy demands. This lactic acid causes fatigue and this is why Janelle has aching and breathing hard. Breathing hard is also automatic reflux to inhale more oxygen and meet oxygen demands but even breathing hard would not be able to make it and the body will shift to anaerobic respiration automatically.

You might be interested in
TIME REMAINING<br> 46:19<br> Which describes the changes in Earth's motion?
irina1246 [14]

Answer:

Options?

Explanation:

7 0
2 years ago
Read 2 more answers
if there is no oxygen during the cellular respiration process, the Krebs cycle does not occur. True or False
Veseljchak [2.6K]
The answer is gonna be false
7 0
3 years ago
Read 2 more answers
The function of the S layer is unclear. The fact that the S layer is found in cultures isolated from natural sources but is typi
mario62 [17]

Answer:

The correct answer is "the S layer may play a role in protecting cells from viruses and predatory bacteria found in nature but not in laboratory cultures".

Explanation:

The S-layer (surface layer) is a part of the cell's envelope comprised of of identical proteins or glycoproteins that could be found in archaes and some bacterias in nature. The function of the S-layer is unknown, however the fact that is only seen in nature suggest that it may play a role in protecting cells from viruses and predatory bacteria found in nature but not in laboratory cultures. It is likely that archaes and bacteria synthesize the S-layer when they recognize viruses and predatory bacteria in nature, the S-layer is not synthesized in laboratory cultures because these pathogens are not present.

4 0
3 years ago
Two examples of human cells and their function​
sashaice [31]

Answer:

Red blood cells, root hair cells in plants

Explanation:

Red blood cell: it has no nucleus. It offers the cell to carry more hemoglobin

Root hair cells in plants: they have a large cytoplasm which enables them to take water from the soil.

4 0
3 years ago
Is a grasshopper a herbivore carnivore or omnivore
Natali [406]

Answer:

Grasshoppers are a herbivores because they eat plants

Explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • Each isotope has a special name derived from Latin (protium, deuterium, and tritium). What structural feature do these names ref
    12·1 answer
  • What lipids are found in animal cell membranes?
    10·2 answers
  • Fermentation is carried out regularly, and not only during oxygen emergencies, by what organisms?
    11·2 answers
  • Antibiotics would be<br> effective on this type<br> of cell.<br> is it prokaryotic or eukaryotic?
    5·1 answer
  • Which structure does this organism use for movement?
    6·1 answer
  • In foxes red fur is dominate (R) Over white Fur, and a long haired Coat is dominate (L) over a short haired coat. A female is he
    7·1 answer
  • Help pls!!!!!.........
    6·1 answer
  • Why
    10·1 answer
  • The north pole and the magnetic pole are what? a-located at the same point b-located near each other c-two different names for t
    8·1 answer
  • Hunter syndrome is a rare genetic disorder in which large sugar molecules called glycosaminoglycans build up in body tissues. Hu
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!