What is the function of the spleen?
tissue repair
hematopoiesis
red blood cell and platelet destruction
blood reservoir
all of the above
The Correct Answer is E
A. tissue repair: The spleen can act as a site for monocytes that aid in tissue healing and immune response.
B. hematopoiesis: While primarily occurring in the bone marrow, the spleen performs hematopoiesis during fetal development and can resume it in adults under certain disease conditions.
C. red blood cell and platelet destruction: The spleen is often called the "red blood cell graveyard" because it filters out and breaks down old or damaged cells.
D. blood reservoir: The spleen can store a significant volume of blood (specifically platelets and RBCs) to be released into circulation if needed.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. weaker the contraction: This is the opposite of the law; a lack of stretch usually results in a weaker stroke volume.
B. slower the heart rate: Starling's Law deals with stroke volume (the force of the pump), not the electrical timing of the heart rate.
C. faster the heart rate: Heart rate is primarily controlled by the SA node and the autonomic nervous system, not fiber stretch.
D. stronger the contraction: Also known as the Frank-Starling mechanism, this law states that the more the cardiac muscle is stretched (due to increased blood filling the heart), the more forcefully it will contract to pump that blood out.
Correct Answer is B
Explanation
A. inspiratory capacity and the residual volume: Residual volume cannot be exhaled and is therefore not part of vital capacity.
B. inspiratory reserve volume, tidal volume, and expiratory reserve volume: Vital Capacity (VC) is the maximum amount of air a person can expel from the lungs after maximum inhalation.
C. tidal volume, residual volume, and expiratory reserve volume: This is incorrect because it includes residual volume (air that stays in the lungs) and excludes inspiratory reserve.
D. inspiratory reserve volume, tidal volume, and inspiratory capacity: This is incorrect because inspiratory capacity already includes tidal volume, making the calculation redundant and incomplete.
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