Study "Systme Nerveux Sxience Exam Final", a flashcard deck on FORKSAI.
Define the primary function of dendrites in a neuron.
Dendrites are specialized extensions of a neuron that are responsible for receiving signals from other neurons. They act as the primary input sites for the neuron, transmitting electrochemical impulses towards the cell body.
How does the myelin sheath contribute to the efficiency of signal transmission within the nervous system?
The myelin sheath acts as an insulating layer around the axon of a neuron. Its primary role is to significantly accelerate the speed at which electrical signals, or nerve impulses, travel along the axon, thereby improving the efficiency and responsiveness of the nervous system.
Distinguish between the roles of the brain and the cerebellum within the Central Nervous System (SNC).
The brain is responsible for higher-level functions such as thought, sensory processing, and voluntary movements. In contrast, the cerebellum primarily focuses on maintaining balance, coordinating movements, and facilitating muscle memory, ensuring smooth and precise motor control.
Which part of the neuron is described as the 'autoroute de l'influx' and what is its main function?
The axon is described as the 'autoroute de l'influx'. Its main function is to transmit the electrochemical signal away from the cell body towards the axon terminals, acting as a high-speed pathway for nerve impulses.
Explain the concept of signal retention in a neuron, specifically regarding the direction of impulse travel.
Signal retention in a neuron refers to the consistent, unidirectional flow of an impulse. The impulse always travels from the dendrites, which receive the signal, through the cell body, down the axon, and finally to the axon terminals, which send the signal to the next neuron.
What is the critical role of the brainstem (tronc cérébral) in the human body?
The brainstem plays a critical role in maintaining involuntary survival functions. These include essential processes such as regulating heart rate and controlling respiration (lungs), which are vital for life and operate without conscious thought.
Which component of the Central Nervous System (SNC) is primarily responsible for reflexes?
The moelle épinière (spinal cord) is primarily responsible for reflexes. It acts as a crucial pathway for nerve signals between the brain and the rest of the body, and it can also process some reflex actions independently of the brain.
A neuron's cell body is essential for which of the following functions?
C. Sustaining the cell's life. The corps cellulaire (cell body) is responsible for the metabolic processes that keep the neuron alive and functioning.
If a person experiences difficulty with coordination and maintaining balance, which part of the Central Nervous System is most likely affected?
B. Cervelet. The cerebellum is specifically responsible for equilibrium, coordination, and muscle memory, making it the most likely area to be affected by such symptoms.
The 'terminaisons' of a neuron perform which action?
D. Send the signal to the next neuron. The terminaisons (axon terminals) are the structures at the end of the axon that transmit the signal to subsequent neurons.