How does the lymphatic system contribute to maintaining fluid balance in the body?
By absorbing excess interstitial fluid and returning it to the blood
By controlling the osmotic pressure in blood vessels
By producing hormones that regulate fluid secretion
By filtering toxins from the bloodstream
The Correct Answer is A
A. By absorbing excess interstitial fluid and returning it to the blood: The lymphatic system collects fluid that leaks from capillaries into tissues, known as interstitial fluid, and transports it back to the circulatory system, preventing edema and maintaining fluid balance.
B. By controlling the osmotic pressure in blood vessels: Osmotic pressure is primarily regulated by plasma proteins and electrolytes, not directly by the lymphatic system.
C. By producing hormones that regulate fluid secretion: Hormonal regulation of fluid balance involves organs like the kidneys and adrenal glands, not the lymphatic system.
D. By filtering toxins from the bloodstream: Lymph nodes filter lymph to remove pathogens and debris, which supports immunity but does not directly regulate fluid balance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. It synchronizes ventricular contraction: Synchronization of ventricular contraction is primarily the function of the Purkinje fibers and the coordinated conduction through the AV node and bundle branches, not the SA node.
B. It prevents backflow of blood: Prevention of backflow is the role of heart valves, such as the mitral and aortic valves, rather than any conduction system component.
C. It delays impulses to allow ventricular filling: The AV node provides a delay to allow the ventricles to fill with blood, which is distinct from the SA node’s role.
D. It initiates the action potential for heart contractions: The sinoatrial (SA) node, located in the right atrium, generates electrical impulses that set the pace for heart rate. These impulses trigger atrial contraction and initiate the cardiac conduction cycle.
Correct Answer is B
Explanation
A. Detection of chemical changes: Chemoreceptors respond to chemical stimuli, such as changes in oxygen, carbon dioxide, or pH, rather than mechanical forces.
B. Detection of mechanical stimuli such as pressure and vibration: Mechanoreceptors are specialized to sense physical deformation of tissues, including pressure, vibration, touch, and stretch, providing critical information about the environment and body position.
C. Detection of light stimuli: Photoreceptors in the eyes detect light and are not involved in sensing mechanical changes.
D. Detection of temperature changes: Thermoreceptors respond specifically to heat or cold, not to mechanical forces like pressure or vibration.
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