What type of cells have a high concentration of mitochondria? 1) skin cells
2) blood cells
3) heart cells
4) nerve cells

When it comes to cells with high concentrations of mitochondria, 3. Heart cells are ranked quite high on the list.

The Mitochondria is very important because:

Muscle cells like the heart need a lot of energy to carry out their functions. The heart for instance needs a higher amount of energy to continually pump blood. For this reason, it has a high concentration of mitochondria to produce that needed energy.

In conclusion, heart cells have a high concentration of mitochondria.

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Explanation:

Mitochondria produce cellular energy via respiration, and cells have more mitochondria if they require more energy. So the cell that has the most Mitochondria per cell is easily cells located in the heart. The reason for this is the cell has to continuously pump blood and maintain a circulatory equilibrium, to serve this function it requires energy continuously but it’s good that respiration happens continuously, all the time, 24/7 to keep you alive. Other cells that require more Mitochondria to serve a particular function: the other cardiovascular cells that aren’t located in the heart but in the arteries and veins, the lung cells exporting carbon dioxide from the body and intaking oxygen all the time (fun fact: your lungs are made up of 80% water :) to assist in “filling” oxygen to the blood) another notable place is the hippocampus located in the central part of the brain, this part of the brain maintains CO2 and Oxygen levels in the blood as well as identifying the body’s internal temperature all the time. The pattern, that cells that require to monitor or deliver a particular function continuously require more Mitochondria to assist in the function. So all in all:

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explanation:

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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