What would happen if there was no cellular respiration?

Answer 1

I presume you are referring to human's cellular respiration and not bacterial cellular respiration.

With human's cellular respiration, you first have to understand that our body uses ATP (short for adenosine triphosphate) as the main source of fuel. It is ATP that helps our body to repair itself, to grow, and to eliminate basic toxins such as carbon dioxide. Second, the main source of ATP is glucose from breakdown of the food we eat.

With that in mind, cellular respiration (also known as aerobic respiration) is the use of inhaled oxygen to more efficiently make ATP. With oxygen/ aerobic respiration, a cell's mitochondria power house can make 36 ATPs from one molecule of glucose via glycolysis + Kreb cycle + electron transfer chain pathway. Whereas without oxygen (aka anaerobic respiration), a cell stops at glycolysis making only 2 ATPs.

As you can see, 36 vs. 2 ATPs is a big difference. A cell that is metabolically active and requires a lot of ATPs such as the neurons (brain cells), the myocardiocytes (heart cells), and the proximal tubule cells (kidney cells) will die off when the glucose supply is depleted from inefficient breakdown to produce ATPs.

So in short, without cellular respiration, a cell will use anaerobic respiration, making 1/16 of normal ATPs, survive for 2 mins to hours (depending on the cellular activities and body temperature) then die off due to depletion of glucose source within the cell or die off due to activation of Fas self-suicide mechanism.

Hope this answers your question. =)

Answer 2

respiration without oxygen present is anaerobic respiration. & fermentation occurs when oxygen is not present.

fermentation= A+LS
If oxygen is not present; anaerobic respiration begins to occur. Anaerobic respiration does not need oxygen. It happens when there is not enough oxygen for aerobic respiration. Here is the word equation:

glucose → lactic acid (+ energy)

Much less energy is released by anaerobic respiration than by aerobic respiration.

Answer 3

it would die.
if cellular respiration is ceased then cell dies because most of the energy is provided through cellular respiration itself.

Answer 4

no oxygen would be taken to the lungs therefore you suffocate and die