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 B
Explanation
Choice B rationale:
Phlebitis is the inflammation of a vein, often caused by an IV catheter. It's characterized by redness, swelling, warmth, and pain along the vein.
Promptly discontinuing the IV infusion is crucial to prevent further irritation and potential complications such as: Thrombophlebitis (inflammation with clot formation)
Infection
Infiltration (leakage of fluids into surrounding tissues) Extravasation (leakage of vesicant or damaging medications)
Continuing the infusion could exacerbate the inflammation and increase the risk of these complications.
Choice A rationale:
Elevation of the extremity can help reduce swelling, but it does not address the underlying inflammation. It's often used as an adjunct measure after discontinuing the IV.
Choice C rationale:
Warm, moist compresses can provide some comfort and potentially promote blood flow, but they are not recommended as a first-line treatment for phlebitis. They may even worsen inflammation in some cases.
Choice D rationale:
Inserting an IV catheter in the opposite extremity is necessary if the patient still requires IV therapy, but it should not be done before addressing the phlebitis in the current site. This could lead to multiple sites of inflammation and increased risk of complications.
Correct Answer is A
Explanation
Choice A rationale:
Hypovolemic shock is a life-threatening condition that occurs when the body loses a significant amount of blood or fluids, leading to a decrease in circulating blood volume. This can result in inadequate perfusion of organs and tissues, which can cause damage and even death if not treated promptly.
In this case, the athlete's symptoms and vital signs are consistent with hypovolemic shock. The athlete has been practicing twice a day in the heat, which can lead to significant fluid loss through sweating. The athlete is also dizzy, which is a common symptom of hypovolemia due to decreased blood flow to the brain. The athlete's blood pressure is low (100/2 mm Hg), pulse rate is elevated (100 beats/minute), and respiratory rate is increased (26 breaths/minute), all of which are compensatory mechanisms to try to maintain blood pressure and perfusion in the setting of hypovolemia. The athlete's skin is cool to touch
and pale in color, which is due to decreased blood flow to the skin. The athlete also does not remember the last voiding time, which may indicate decreased urine output, another sign of hypovolemia.
Key points supporting hypovolemic shock:
Significant fluid loss due to exercise in the heat Dizziness
Low blood pressure Elevated pulse rate Increased respiratory rate Cool, pale skin
Decreased urine output Additional details:
Hypovolemic shock can be caused by various factors, including:
Hemorrhage (blood loss) Severe dehydration Burns
Severe vomiting or diarrhea
Treatment for hypovolemic shock typically involves:
Intravenous fluid replacement to restore circulating blood volume Blood transfusion if the shock is due to hemorrhage
Oxygen therapy to support breathing
Medications to support blood pressure and heart function
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