Biochemistry of the Nervous System, Part 2

Front

What role do neurons play in the human body?

Back

Transmit signals

Answer explanation

The primary function of neurons is to transmit signals rapidly throughout the body, allowing for communication between different parts of the nervous system. This is essential for coordinating responses and processing information.

Front

What role does the sodium-potassium pump play in neurons?

Back

Maintain ionic gradients

Answer explanation

The sodium-potassium pump is crucial in neurons as it maintains ionic gradients by actively transporting sodium out and potassium into the cell, which is essential for generating action potentials and overall neuronal function.

Front

Which organelle is responsible for producing ATP in neurons?

Back

Mitochondria

Answer explanation

The mitochondria are known as the powerhouse of the cell, responsible for producing ATP, the energy currency, which is crucial for the high energy demands of neurons.

Front

What causes neurotransmitters to be released from synaptic vesicles during a biology class experiment?

Back

Arrival of an action potential

Answer explanation

The arrival of an action potential at the synaptic terminal triggers the opening of voltage-gated calcium channels, leading to an influx of calcium ions. This influx causes synaptic vesicles to fuse with the membrane and release neurotransmitters.

Front

Which neurotransmitter is made from glutamine?

Back

Glutamate

Answer explanation

Glutamate is synthesized from glutamine through the action of the enzyme glutaminase. It is a key neurotransmitter in the brain, involved in excitatory signaling, making it the correct answer.

Front

Identify the main inhibitory neurotransmitter in the nervous system.

Back

GABA

Answer explanation

GABA (gamma-aminobutyric acid) is the principal inhibitory neurotransmitter in the nervous system, playing a crucial role in reducing neuronal excitability and preventing overstimulation.

Front

How is neurotransmitter action stopped in the human body?

Back

Through reuptake, enzymatic degradation, or diffusion

Answer explanation

Neurotransmitter action is terminated mainly through reuptake into the presynaptic neuron, enzymatic degradation by specific enzymes, or diffusion away from the synaptic cleft, ensuring precise signaling in the nervous system.

Front

What is neuroplasticity?

Back

The brain's ability to change

Answer explanation

Neuroplasticity refers to the brain's ability to change and adapt in response to experiences, learning, and injury. This makes the first choice correct, as it captures the essence of how the brain can reorganize itself.

Front

What occurs with repeated practice?

Back

Neural pathways become more efficient

Answer explanation

When you practice something repeatedly, neural pathways become more efficient. This means that the connections between neurons strengthen, allowing for quicker and more effective processing of information.

Front

What role does calcium play in the release of neurotransmitters?

Back

Trigger synaptic vesicle fusion

Answer explanation

Calcium ions play a crucial role in neurotransmitter release by triggering the fusion of synaptic vesicles with the presynaptic membrane, allowing neurotransmitters to be released into the synaptic cleft.