Physiological muscle fatigue may be caused by:
a relative lack of ATP.
high levels of lactate.
failure of the sodium-potassium pumps.
all of the above.
The Correct Answer is D
A. a relative lack of ATP: ATP is required for the cross-bridge cycle; a deficiency prevents muscle contraction and relaxation.
B. high levels of lactate: Anaerobic respiration leads to lactic acid buildup, which lowers pH and interferes with enzyme activity and calcium binding.
C. failure of the sodium-potassium pumps: Ion imbalances caused by pump failure prevent the muscle membrane from repolarizing correctly.
D. all of the above: Muscle fatigue is a complex process caused by the combination of energy depletion, chemical buildup, and ion imbalances.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. plasma, intracellular fluid, interstitial fluid: Plasma is actually the smallest volume of the three.
B. intracellular fluid, interstitial fluid, plasma: The majority of body water is inside cells (ICF), followed by the fluid between cells (interstitial), and finally the fluid in the blood (plasma).
C. intracellular fluid, plasma, interstitial fluid: There is significantly more interstitial fluid in the body than there is blood plasma.
D. plasma, intracellular fluid, interstitial fluid: Plasma is actually the smallest volume of the three.
Correct Answer is B
Explanation
A. inspiration occurs: Inspiration happens when intrapulmonary pressure is lower than atmospheric pressure, drawing air in.
B. expiration occurs: According to Boyle's Law, air moves from areas of high pressure to low pressure. If the pressure inside the lungs is higher than the outside air, air is forced out.
C. lung tissue has collapsed: A collapsed lung (pneumothorax) occurs when the pressure in the pleural space equals atmospheric pressure, not necessarily when lung pressure is higher.
D. the bronchioles are obstructed: Obstruction changes resistance to airflow, but the pressure gradient itself is what defines the phase of breathing.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.