Answer :
The correct sequence for a regulatory reflex arc is option (b): stimulus, receptor, afferent pathway, integrating center, efferent pathway, effector.
In a regulatory reflex arc, the process is as follows:
- Stimulus: A shift in the surroundings that prompts a reaction is called a stimulus.
- Receptor: The area of the body called a receptor is where a stimulus is detected or received. For instance, receptors found in the skin, eyes, or hearing.
- Afferent Pathway: The path through which the receptor sends information towards the integrating center. This typically involves sensory neurons.
- Integrating Center: The control center where the signals are received, analyzed, and an appropriate response is determined. In humans, this is often the brain or spinal cord.
- Efferent Pathway: The path through which the integrating center sends signals to the effector to produce a response. This typically involves motor neurons.
- Effector: the location in the body where a reaction is produced. This can be a muscle, gland, or another organ that acts to restore homeostasis or produce an appropriate reaction to the stimulus.
Final answer:
The correct sequence for a regulatory reflex arc is 'b. stimulus, receptor, afferent pathway, integrating center, efferent pathway, effector', which outlines the process from detecting a stimulus to responding to it.
Explanation:
Within the context of the nervous system and regulatory reflex arcs, the correct sequence of events after a stimulus is as follows:
- Stimulus: A change in the environment that triggers the reflex.
- Receptor: The site within the body that detects or receives the stimulus.
- Afferent pathway: The sensory neurons that carry the signal towards the central nervous system.
- Integrating center: Typically the brain or spinal cord where the information is processed and an appropriate response is determined.
- Efferent pathway: The motor neurons that carry the signal away from the central nervous system to the effector.
- Effector: The body site, such as a muscle or gland, where the response to the stimulus is generated.
So, the correct option from the given choices is 'b. stimulus, receptor, afferent pathway, integrating center, efferent pathway, effector'.