Glucose is primarily used as what by nervous tissue?

Glucose is primarily used as what by nervous tissue?

• A. Energy source
• B. Structural component of bone
• C. Hormone
• D. Neurotransmitter

Answer: (A)

Glucose is the main fuel for nervous tissue. Neurons have very high energy demands to maintain resting membrane potential, power ion pumps, propagate action potentials, and support synaptic transmission. This energy comes from glycolysis and the oxidative metabolism of glucose, and the brain relies on a continuous glucose supply because it stores little glycogen for its own use. While ketone bodies can supplement energy during prolonged fasting, glucose remains essential for most neuronal functions. It is not used as a structural component of bone, a hormone, or a neurotransmitter.

Glucose is the main fuel for nervous tissue. Neurons have very high energy demands to maintain resting membrane potential, power ion pumps, propagate action potentials, and support synaptic transmission. This energy comes from glycolysis and the oxidative metabolism of glucose, and the brain relies on a continuous glucose supply because it stores little glycogen for its own use. While ketone bodies can supplement energy during prolonged fasting, glucose remains essential for most neuronal functions. It is not used as a structural component of bone, a hormone, or a neurotransmitter.