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Which of the following changes in the cell membrane of the heart's nodal tissue can lead to an increase in heart rate as a result of stimulating sympathetic nerves?
  • a)
     opening of sodium channels is facilitated
  • b)
    potassium conductance is increased
  • c)
    aquaporins are upregulated
  • d)
    opening of L-calcium channels are facilitated
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following changes in the cell membrane of the heart's nod...
Concept:
  • The autonomic nervous system (ANS) is the component of the peripheral nervous system that controls cardiac muscle contraction, visceral activities, and glandular functions of the body.
  • The sympathetic nervous system releases noradrenaline while the parasympathetic nervous system releases acetylcholine (ACh). Sympathetic stimulation increases heart rate and myocardial contractility.
​Explanation:
Fig 1: Sympathetic nerves and cardiac myocyte
  • The whole mammalian heart is innervated by
    Sympathetic nerves (
    SNs), which enter the heart from the epicardium and extend their processes throughout the myocardial interstitium, running parallel to capillary vessels.
  • In Sympathetic neurotransmission, the arrival of an action potential in the synaptic nerve terminal leads to Ca2+ entry via voltage-gated Ca2+ channels.
  • This triggers exocytosis of noradrenaline into the synaptic clefts, which acts on the β1 adrenoreceptor, altering myocyte behavior by opening L-calcium channels and signaling cascade in the myocyte.
hence the correct answer is option 4
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Which of the following changes in the cell membrane of the heart's nodal tissue can lead to an increase in heart rate as a result of stimulating sympathetic nerves?a)opening of sodium channels is facilitatedb)potassium conductance is increasedc)aquaporins are upregulatedd)opening of L-calcium channels are facilitatedCorrect answer is option 'D'. Can you explain this answer?
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Which of the following changes in the cell membrane of the heart's nodal tissue can lead to an increase in heart rate as a result of stimulating sympathetic nerves?a)opening of sodium channels is facilitatedb)potassium conductance is increasedc)aquaporins are upregulatedd)opening of L-calcium channels are facilitatedCorrect answer is option 'D'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which of the following changes in the cell membrane of the heart's nodal tissue can lead to an increase in heart rate as a result of stimulating sympathetic nerves?a)opening of sodium channels is facilitatedb)potassium conductance is increasedc)aquaporins are upregulatedd)opening of L-calcium channels are facilitatedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following changes in the cell membrane of the heart's nodal tissue can lead to an increase in heart rate as a result of stimulating sympathetic nerves?a)opening of sodium channels is facilitatedb)potassium conductance is increasedc)aquaporins are upregulatedd)opening of L-calcium channels are facilitatedCorrect answer is option 'D'. Can you explain this answer?.
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