Dr Gawad Physiology Course Online Exams – Pain

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Quizzes Created: 2 | Total Attempts: 1,108
Questions: 7 | Attempts: 447

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Dr Gawad Physiology Course Online Exams  Pain - Quiz

7 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 7 (you will get the results immediately with correction by the web)
Passing score 60%
Allowed time: 8 min
Good Luck


Questions and Answers
  • 1. 

    All the following are true regarding a pain originated from biceps muscle except:

    • A.

      It is transmitted by thin slow nerve fibers.

    • B.

      Usually associated with low heart rate.

    • C.

      The muscle is relaxed to avoid more pain.

    • D.

      This pain may be due to decreasing the blood supply to the muscle.

    Correct Answer
    C. The muscle is relaxed to avoid more pain.
    Explanation
    The correct answer is that the muscle is relaxed to avoid more pain. This is because when a muscle is in pain, it tends to tense up rather than relax. This is a natural protective mechanism of the body to prevent further injury or damage to the muscle. So, it is not true that the muscle would relax to avoid more pain.

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  • 2. 

    Regarding cutaneous pain, which of the following is true:

    • A.

      Fast immediate cutaneous pain is transmitted by paleospinothalameic tract

    • B.

      Neospinothalamic tract is connected to the reticular formation

    • C.

      Sever cutaneous pain associated with hypotension

    • D.

      Lateral spinothalamic tract is specific only for cutaneous pain transmission

    Correct Answer
    C. Sever cutaneous pain associated with hypotension
    Explanation
    Severe cutaneous pain is associated with hypotension. When an individual experiences intense pain, it can trigger a physiological response known as the "fight or flight" response. This response includes the release of stress hormones, such as adrenaline, which can cause a decrease in blood pressure. This drop in blood pressure is what leads to the association between severe cutaneous pain and hypotension.

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  • 3. 

    About the true visceral pain:

    • A.

      It is transmitted by somatic nerve fibers.

    • B.

      Cardiac pain is conducted through afferent sympathetic nerve fibers.

    • C.

      Pain from the testis is conducted through dorsal column leminiscus pathway.

    • D.

      It is sharply localized.

    Correct Answer
    B. Cardiac pain is conducted through afferent sympathetic nerve fibers.
    Explanation
    Cardiac pain is conducted through afferent sympathetic nerve fibers because the heart is innervated by sympathetic nerve fibers that transmit pain signals to the brain. This type of pain is often described as a deep, crushing or squeezing sensation in the chest, and it can radiate to other areas of the body such as the left arm or jaw. The sympathetic nervous system is responsible for the body's "fight or flight" response, and it plays a role in regulating heart rate and blood pressure. Therefore, it makes sense that cardiac pain would be conducted through these nerve fibers.

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  • 4. 

    About hyperalgesia which of the following is true:

    • A.

      The pain receptor is rapidly adapting

    • B.

      1ry hyperalgesia is due to central facilitation.

    • C.

      Secondary hyperalgesia is due to decreased receptor threshold.

    • D.

      Area of flare is due to release of histamine from injured area.

    Correct Answer
    D. Area of flare is due to release of histamine from injured area.
    Explanation
    The area of flare refers to the redness and swelling that occurs around an injured area. This is caused by the release of histamine, a chemical mediator, from the injured area. Histamine causes vasodilation and increased permeability of blood vessels, leading to the characteristic redness and swelling. This response is part of the inflammatory process and contributes to the sensitization of pain receptors in the area, leading to hyperalgesia. Therefore, the statement that the area of flare is due to the release of histamine from the injured area is true.

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  • 5. 

    Which of the following is true regarding referred pain:

    • A.

      cutaneous pain felt not only in the diseased area but also at a viscus a distance away

    • B.

      Physiology of referred pain can be explained by dual thalamus supply

    • C.

      Dermatomal rule can explain referred pain

    • D.

      None of the above

    Correct Answer
    C. Dermatomal rule can explain referred pain
    Explanation
    The correct answer is "dermatomal rule can explain referred pain." The dermatomal rule states that pain originating from a specific area of the body is referred to the corresponding dermatome. This means that pain felt in a certain area of the body can be traced back to a specific nerve root. Referred pain occurs when pain is felt in a different area of the body than the actual source of the pain. The dermatomal rule helps to explain this phenomenon by showing how the nerves from different areas of the body converge and share pathways in the spinal cord.

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  • 6. 

    Regarding spinal cord gate theory of pain, which is true:

    • A.

      Inhibitory neuron (which is relaying on the second order neuron of the lateral spinothalamic tract) is tonically inactive

    • B.

      Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.

    • C.

      Stimulation of nearby A myleinated fibers will activate second order neuron of the near spinothalamic pathway by inhibition of the interneuron.

    • D.

      None of the above

    Correct Answer
    B. Stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron.
    Explanation
    According to the spinal cord gate theory of pain, the correct statement is that stimulation of the sensory C fiber afferent of the lateral spinothalamic tract will inhibit the tonically active inhibitory interneuron. This theory suggests that the transmission of pain signals can be modulated by inhibitory interneurons in the spinal cord. When the C fiber afferents are stimulated, they can activate inhibitory interneurons, which in turn inhibit the transmission of pain signals. This mechanism helps to regulate and control the perception of pain.

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  • 7. 

    Regarding brain opiate analgesic system, which is true:

    • A.

      Descending neuron from brain stem targeting to decrease the release of acetyl choline chemical transmitter from first order neuron (sensory afferent) of lateral spinothalamic tract

    • B.

      The neuron originating from Raphe nucleus is encephalinergic neuron

    • C.

      Post synaptic inhibition is by maintaining depolarization.

    • D.

      Presynaptic inhibition by the local neuron is by inhibition of exocytosis from presynaptic knob

    Correct Answer
    D. Presynaptic inhibition by the local neuron is by inhibition of exocytosis from presynaptic knob
    Explanation
    Presynaptic inhibition by the local neuron is a mechanism by which the release of neurotransmitters from the presynaptic knob is inhibited. This occurs through the inhibition of exocytosis, which is the process by which neurotransmitters are released into the synaptic cleft. By inhibiting exocytosis, the local neuron reduces the amount of neurotransmitter available for binding to postsynaptic receptors, thereby decreasing synaptic transmission and inhibiting the propagation of signals. This mechanism plays a role in modulating synaptic activity and regulating the strength of neuronal communication in the brain's opiate analgesic system.

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