Need with my review, will give brainliest to anyone who gives a decent explanation to their answer.

which statements best describe the second stage of cellular respiration? check all that apply.

the stage happens in the cytoplasm.
the stage happens in mitochondria.
oxygen combines with small molecules.
glucose is broken down.
energy is released.

The stage happens in mitochondria.

Energy is released.

Explanation:

The second stage of cellular respiration is the Krebs cycle

In the first stage of respiration, called glycolysis, a molecule of glucose is broken down into two molecules of pyruvate. Therefore the option "Glucose is broken down" is wrong, as this happens in the first stage

Prior to the beginning of the Krebs cycle, pyruvate is converted into Acetyl CoA, and then enters the Krebs cycle, where it undergoes a series of reactions (oxidation) to generate CO2, and the NAHD, FADH2, and ATP. Therefore, it is true that energy is released (in the form of ATP)

The Krebs cycle occurs in the mitochondria (not the cytoplasm, there is where oxidative phosphorylation occurs).

I would also say that oxygen combines with small molecules best describes oxidative phosphorylation (or the electron transport chain), where oxygen acts as the final electron acceptor, and is reduced to water.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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