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. Is not a major factor in blood pressure in healthy individuals:Peripheral resistance is a critical determinant of blood pressure, even in healthy individuals. Resistance in the arterioles directly affects how hard the heart must pump to maintain adequate perfusion.
B. Increases as blood viscosity increases:Higher blood viscosity, such as from elevated hematocrit, increases the internal friction within blood vessels. This greater resistance makes it more difficult for blood to flow, thereby raising peripheral resistance and contributing to higher blood pressure.
C. Increases as blood vessel diameter increases:Peripheral resistance actually decreases as vessel diameter increases because wider vessels allow blood to flow more easily. Vasoconstriction, not dilation, is what increases resistance.
D. Decreases with increasing length of the blood vessel:Resistance increases with the length of a blood vessel since a longer vessel provides more frictional surface for blood flow. Therefore, this statement is incorrect; longer vessels contribute to higher, not lower, peripheral resistance.
Correct Answer is C
Explanation
A. Emotions:Emotional states, such as stress or anxiety, stimulate the sympathetic nervous system, increasing heart rate and thus affecting the pulse rate. Emotional fluctuations can cause measurable changes in pulse readings.
B. Activity:Physical activity raises heart rate to meet the increased oxygen and nutrient demands of tissues. Pulse rate typically rises during exercise and decreases with rest, making activity a significant factor.
C. The vessel selected to palpate:The choice of vessel (e.g., radial, carotid, brachial) does not inherently alter the actual heart rate; it only provides a site to detect the pulse. Pulse readings reflect heart rate regardless of which accessible artery is used.
D. Postural changes:Changes in body position, such as standing or sitting, can temporarily influence heart rate due to shifts in venous return and baroreceptor responses. This makes postural changes a relevant factor in pulse rate variability.
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