Which of the following is NOT a function of the lymphatic system?
transporting dietary fats
draining excess interstitial fluid
transporting respiratory gases
carrying out immune responses
The Correct Answer is C
A. Transporting dietary fats: The lymphatic system absorbs fats and fat-soluble vitamins from the digestive tract through specialized lymphatic vessels called lacteals. This is an important function that complements nutrient absorption and delivery to the bloodstream.
B. Draining excess interstitial fluid: Lymphatic vessels collect fluid that leaks from blood capillaries into tissues and return it to the circulatory system. This prevents edema and maintains fluid balance, making it a key function of the lymphatic system.
C. Transporting respiratory gases: Transport of oxygen and carbon dioxide is the primary role of the cardiovascular system, not the lymphatic system. Lymph does not carry respiratory gases, so this is not a function of lymphatic vessels.
D. Carrying out immune responses: The lymphatic system supports immune function by housing lymphocytes, filtering lymph through lymph nodes, and facilitating antigen detection. This makes immune defense a central role of the lymphatic system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. A decrease in oxygen levels:While low oxygen levels stimulate chemoreceptors, baroreceptors are not primarily sensitive to oxygen. Their function is focused on detecting pressure changes rather than gas concentrations.
B. Changes in arterial pressure:Baroreceptors in the carotid sinus and aortic arch detect stretch in the arterial walls caused by increases or decreases in blood pressure. This information is sent to the cardiovascular center to regulate heart rate and vessel tone, making them pressure-sensitive sensors.
C. An increase in oxygen levels:High oxygen levels do not directly affect baroreceptor activity. Baroreceptors respond to mechanical stretch, not oxygen concentration, so oxygen changes are irrelevant to their primary function.
D. A decrease in carbon dioxide:Carbon dioxide levels primarily influence chemoreceptors, not baroreceptors. While CO₂ can indirectly affect cardiovascular responses, baroreceptors themselves do not respond to changes in CO₂.
Correct Answer is B
Explanation
A. Cisterna chyli:The cisterna chyli is a sac-like structure in the abdomen that collects lymph from the lower limbs and digestive organs. It does not receive lymph from the upper limbs, so it is not involved in draining the left arm.
B. Thoracic duct:The thoracic duct is the main lymphatic vessel that drains lymph from the left side of the head, neck, chest, and entire left upper and lower limbs. Lymph from the left arm enters the venous circulation via the thoracic duct at the junction of the left subclavian and internal jugular veins.
C. Axillary nodes:Axillary lymph nodes filter lymph from the upper limbs and shoulder region. While lymph passes through these nodes, they are not the final structure that drains lymph into the venous circulation.
D. Right lymphatic duct:The right lymphatic duct drains lymph from the right side of the head, neck, thorax, and right upper limb. It does not receive lymph from the left arm, making it irrelevant in this pathway.
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