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 C
Explanation
Choice A rationale:
Pallor, or paleness, is not a typical sign of phlebitis. It can be associated with other conditions such as anemia, decreased blood flow, or shock. In the context of IV therapy, pallor at the insertion site might suggest a problem with blood flow, such as infiltration or a clot, but it's not a direct indication of inflammation.
Choice B rationale:
Coolness at the IV site is also not a characteristic sign of phlebitis. It could potentially suggest infiltration of the IV fluids into the surrounding tissues, but it's not a primary indicator of inflammation. Phlebitis typically involves warmth and redness due to the inflammatory response.
Choice C rationale:
Erythema, or redness, is the hallmark sign of phlebitis. It's caused by the dilation of blood vessels in the area as part of the inflammatory response. The redness is often accompanied by warmth, swelling, and tenderness along the vein.
Mechanism of erythema in phlebitis:
When the inner lining of the vein (endothelium) is irritated or damaged by the IV catheter, it releases inflammatory mediators. These mediators cause the blood vessels to dilate, leading to increased blood flow and redness in the area.
The redness is often more pronounced along the path of the vein, rather than just at the insertion site.
Choice D rationale:
Drainage from the IV site can be a sign of infection, but it's not a primary feature of phlebitis. If drainage is present, it's important to assess for other signs of infection, such as pus, fever, or increased pain.
Correct Answer is C
Explanation
Choice A rationale:
This response is dismissive of the patient's pain and does not offer any assistance. It also does not acknowledge the patient's concerns about their pain being a normal part of aging.
It's important to validate the patient's experience and offer support, even if the pain level is not severe.
This response could lead to the patient feeling unheard and unsupported, and it could potentially delay necessary treatment.
Choice B rationale:
This response suggests that the patient's pain is not significant enough to warrant treatment unless it worsens. This is not appropriate, as pain is subjective and should be treated based on the patient's individual experience.
Additionally, this response reinforces the patient's belief that pain is a normal part of aging, which may prevent them from seeking treatment in the future.
Choice C rationale:
This response is the best option because it acknowledges the patient's pain, expresses concern, and suggests further investigation.
It is important to rule out any underlying medical conditions that may be causing the pain.
This response also demonstrates to the patient that the nurse is taking their pain seriously and is committed to helping them manage it.
Choice D rationale:
This response acknowledges that pain can be a part of aging, but it also suggests that there may be a specific cause for the patient's pain.
This could lead to the patient feeling anxious or worried about their health.
It is important to investigate the cause of the pain before making any assumptions.
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