What is the main function of mitochondria in neurons?

What is the main function of mitochondria in neurons?

• A. Metabolic energy production
• B. Protein synthesis
• C. DNA storage
• D. Waste processing

Answer: (A)

Metabolic energy production is the main function. Neurons rely on a constant, high supply of ATP to maintain resting membrane potential with Na+/K+ pumps and to fuel the ATP-dependent steps of neurotransmitter release and synaptic vesicle cycling. Mitochondria generate most of this ATP through oxidative phosphorylation, and their distribution and ability to upregulate respiration at active synapses match the intense energy demands of neuronal signaling. Protein synthesis happens mainly on cytosolic ribosomes and rough ER, with only a small, specialized contribution from mitochondrial ribosomes. Mitochondria do contain their own DNA, but storing genetic material is not their primary role in neurons. Waste processing is handled mainly by lysosomes and related pathways, not mitochondria.

Metabolic energy production is the main function. Neurons rely on a constant, high supply of ATP to maintain resting membrane potential with Na+/K+ pumps and to fuel the ATP-dependent steps of neurotransmitter release and synaptic vesicle cycling. Mitochondria generate most of this ATP through oxidative phosphorylation, and their distribution and ability to upregulate respiration at active synapses match the intense energy demands of neuronal signaling.

Protein synthesis happens mainly on cytosolic ribosomes and rough ER, with only a small, specialized contribution from mitochondrial ribosomes. Mitochondria do contain their own DNA, but storing genetic material is not their primary role in neurons. Waste processing is handled mainly by lysosomes and related pathways, not mitochondria.