A nurse is teaching a nursing student how blood can return to the heart when pressure in the venous capillary beds is very low. Which statement by the student indicates a need for further teaching?
a. "Constriction of small muscles in the venous wall increases venous pressure."
b. "Negative pressure in the left atrium draws blood toward the heart."
c. "Skeletal muscles relax to allow the free flow of blood."
d. "Venous valves help prevent the backflow of blood."
ANS: C
Skeletal muscle contraction, along with one-way venous valves, help create an "auxiliary" venous pump that helps drive blood toward the heart. Constriction of small muscles in venous walls helps increase venous pressure. Negative pressure in the left atrium sucks blood toward the heart. Valves, which are one-way, work with the contraction of skeletal muscles to create a venous pump.
You might also like to view...
Light skin and thin body habitus are risk factors for:
a. rheumatoid arthritis. b. osteoarthritis. c. congenital bony defects. d. osteoporosis.
Psychiatric nurses often care for clients who are preparing for or have undergone electroconvulsive therapy (ECT). Which statement is accurate regarding ECT?
A) Electrical stimulation to the brain produces a grand mal seizure. B) Maximal muscle movement is required to ensure efficacy of the treatment. C) The client will sleep for about 12 hours after treatment. D) The client will fully recall what occurred during the treatment.
A client has chronic obstructive pulmonary disease (COPD) exacerbation. The pulse oximeter shows a saturation of 86% on room air. The nurse assesses diminished lung sounds and low-pitched wheezing posteriorly, shallow respirations, respiratory rate of 32/min, and use of accessory muscles. What is the most appropriate oxygen delivery device for this client?
a. Nasal cannula b. Non-rebreathing mask c. Oxymizer d. Venturi mask
A 32 week gestation infant with decreased renal function develops systemic candidiasis. The best choice of antifungal therapy for this baby is:
a. Amphotericin B lipid complex b. fluconazole c. flucytosine