Grade 9 Nervous System Quiz & Flashcards

A neuron is a specialized cell that helps you gather, interpret, and react to information about your ______

The region of a neuron that receives impulses from other neurons and conducts them to the cell body is called ______

Neurotransmitter is a chemical that diffuses across a synapse and binds to receptors on the dendrite of a neighboring ______

Drugs that slow down the central nervous system are called ______

What is the function of a neurotransmitter?

Define the term 'threshold' in the context of neurons.

Explain the role of rods in the visual system.

What is the significance of the node in the myelin sheath along the length of an axon?

Describe the process of addiction, both psychologically and physiologically.

What is the function of the node in the myelin sheath along the length of an axon?

Explain the process of addiction, both psychologically and physiologically.

What are depressant drugs and how do they affect the central nervous system?

Describe the function of neurotransmitter in neuronal communication.

How do rods contribute to the visual system?

A neuron is a specialized cell that helps gather, interpret, and react to information about the environment.
The dendrite region of a neuron receives impulses from other neurons and conducts them to the cell body.

Neurotransmitters are chemicals that diffuse across a synapse and bind to receptors on the dendrite of a neighboring neuron.
The function of a neurotransmitter is to transmit signals between neurons.

Depressant drugs slow down the central nervous system.
Depressant drugs affect the central nervous system by slowing down neural activity.

The threshold is the minimum strength of an impulse required to trigger an action potential in a neuron.

Rods are specialized photoreceptors in the retina that contribute to the visual system by detecting low light levels.
Rods are sensitive to low light levels and are essential for peripheral and night vision.

The node is a gap in the myelin sheath along the length of an axon that allows for rapid saltatory conduction of action potentials.
The function of the node in the myelin sheath is to facilitate the rapid transmission of action potentials along the axon.

Addiction is a complex process that involves both psychological and physiological changes in the brain.
Psychological factors contributing to addiction include craving and motivation, while physiological factors include changes in neural circuits and synaptic plasticity.
The process of addiction involves long-term changes in gene expression, neural circuits, and synaptic strength, leading to compulsive drug-seeking behavior.