"I'm going to hold my breath until I die and it will be all your fault!" shrieked 6-year-old Riley at her father. Why would she be unable to carry out her threat?
Decreased CO2 and hydrogen ion concentrations and increased oxygen concentration stimulate her chemoreceptors, triggering inspiration.
The inflation reflex would not her allow to keep her lungs full of air for a prolonged period. The reflex would trigger inspiration.
Increased CO2 and hydrogen ion concentrations and decreased oxygen concentration stimulate her chemoreceptors, triggering inspiration.
The diaphragm will begin to fatigue and will not be able to hold its contracted position for more than a short period of time.
The Correct Answer is C
A. Decreased CO₂ and hydrogen ion concentrations and increased oxygen concentration stimulate her chemoreceptors, triggering inspiration. - Chemoreceptors respond to increased CO₂/decreased O₂.
B. The inflation reflex would not allow her to keep her lungs full of air for a prolonged period. The reflex would trigger inspiration. -The Hering–Breuer reflex prevents overinflation, not relevant here.
C. Increased CO₂ and hydrogen ion concentrations and decreased oxygen concentration stimulate her chemoreceptors, triggering inspiration. -Rising CO₂ strongly stimulates medullary chemoreceptors → involuntary breathing resumes.
D. The diaphragm will begin to fatigue and will not be able to hold its contracted position for more than a short period of time. -Breathing resumes due to chemoreceptor drive before muscle fatigue sets in.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Tunica media: Middle layer made of smooth muscle and elastic fibers; not the innermost layer.
B. Tunica externa: Outermost connective-tissue layer (adventitia) that contains collagen and sometimes vasa vasorum; not the innermost.
C. Endothelium: The simple squamous cell lining that forms the innermost surface (part of the tunica intima).
D. Vasa vasorum: Small blood vessels that supply the walls of large vessels, located in the outer layers; not the innermost.
Correct Answer is A
Explanation
A. Radial: The radial pulse is palpated at the lateral (thumb) side of the wrist between the tendons of the flexor carpi radialis and the abductor pollicis longus -it is superficial and commonly used clinically, so this is the correct pulse for a wrist/forearm highlighted area.
B. Ulnar: The ulnar pulse lies on the medial (pinky) side of the wrist and is deeper and often harder to palpate than the radial; it would not be the best choice if the highlighted area is lateral at the thumb side.
C. Brachial: The brachial pulse is felt on the medial aspect of the arm (at the antecubital fossa or just medial to the biceps tendon) and is used for infants or blood pressure -it is not located at the distal wrist.
D. Dorsalis pedis: The dorsalis pedis pulse is on the dorsum of the foot (between the tendons over the instep) and is unrelated to a wrist/forearm highlighting.
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