What triggers the afferent pathways, resulting in the sensation of pain?
Spinal cord
Nociceptors
Endorphins
Cortex
The Correct Answer is B
Choice A rationale:
The spinal cord plays a crucial role in pain transmission, but it does not initiate the afferent pathways. It receives pain signals from nociceptors and relays them to the brain for processing.
The spinal cord is also involved in pain modulation, as it can dampen or amplify pain signals depending on various factors. However, it is not the primary trigger for pain sensation. That role belongs to nociceptors.
Choice B rationale:
Nociceptors are specialized sensory receptors that detect potentially damaging stimuli, such as intense heat, pressure, or chemical irritants.
They are located throughout the body, including the skin, muscles, joints, and internal organs.
When nociceptors are activated, they generate electrical signals that travel along nerve fibers to the spinal cord and brain. This process initiates the afferent pathways, which ultimately lead to the conscious perception of pain.
Nociceptors are essential for protecting the body from harm. They alert us to potential dangers and trigger responses that help us avoid injury or further damage.
Choice C rationale:
Endorphins are natural pain-relieving substances produced by the body. They act on receptors in the brain and spinal cord to reduce pain perception.
However, endorphins do not trigger the afferent pathways. They work by modulating pain signals that have already been initiated by nociceptors.
Choice D rationale:
The cortex is the outer layer of the brain that is responsible for higher-level functions, such as thinking, feeling, and decision- making.
It plays a role in the conscious experience of pain, but it does not trigger the afferent pathways.
The cortex receives pain signals from the spinal cord and processes them, leading to the awareness of pain.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["50"]
Explanation
Here are the steps to calculate the gtt/min for the manual IV infusion:
Step 1: Convert the infusion time from hours to minutes. 8 hours x 60 minutes/hour = 480 minutes
Step 2: Divide the total volume of fluid (in mL) by the infusion time in minutes to get the mL/min rate. 400 mL ÷ 480 minutes = 0.8333 mL/min
Step 3: Multiply the mL/min rate by the drop factor (gtt/mL) to get the gtt/min rate. 0.8333 mL/min x 60 gtt/mL = 50 gtt/min
Therefore, the nurse should set the manual IV infusion to deliver 50 gtt/min.
Correct Answer is C
Explanation
Choice A rationale:
Irreversible shock is the final stage of shock, where the body's compensatory mechanisms have failed, and damage to vital organs is irreversible. This stage is characterized by:
Profound hypotension (systolic blood pressure persistently below 60 mmHg) Severely altered mental status (unresponsiveness or coma)
Widespread organ failure (kidney failure, liver failure, respiratory failure) Lack of response to aggressive fluid resuscitation and vasopressor therapy
The patient in the question does not exhibit all of these signs and symptoms, particularly the profound hypotension and irreversible organ failure. Therefore, irreversible shock is not the most likely stage.
Choice B rationale:
End-organ dysfunction is a stage of shock where inadequate tissue perfusion has begun to cause damage to vital organs. This stage is characterized by:
Hypotension that may respond to fluid resuscitation
Signs of organ dysfunction, such as decreased urine output, altered mental status, or respiratory distress
The patient in the question does have some signs of organ dysfunction, such as confusion and crackles on lung auscultation. However, the hypotension is not as severe as typically seen in end-organ dysfunction shock, and there is no mention of other organ dysfunction like decreased urine output. Therefore, end-organ dysfunction is not the most likely stage.
Choice C rationale:
Early reversible shock is the initial stage of shock, where the body's compensatory mechanisms are still able to maintain blood pressure and organ perfusion. This stage is characterized by:
Mild to moderate hypotension Tachycardia
Cool, clammy skin Narrowed pulse pressure Restlessness or anxiety
The patient in the question presents with all of these signs and symptoms, making early reversible shock the most likely stage.
Choice D rationale:
Preshock is a state of impending shock, where the body's compensatory mechanisms are activated but not yet fully effective. This stage is characterized by:
Normal or slightly low blood pressure Tachycardia
Cool, clammy skin Restlessness or anxiety
The patient in the question has hypotension, which is not consistent with preshock. Therefore, preshock is not the correct stage.
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