The composition of lymph most closely resembles: a) intracellular fluid. b) plasma. c) interstitial fluid. d) synovial fluid. 2. Lymphatic vessels in the skin follow veins. Lymphatic vessels in the viscera follow arteries. a) Both statements are true. b) Both statements are false. c) The first statement is true; the second is false. d) The second statement is true; the first is false 3. Lymphatic capillaries are found in tissues throughout the body except for: a) red bone marrow. b) brain. c) spinal cord. d) all of the above. 4. Which of the following is NOT the function of lymphatic system? a) It returns excess interstitial fluid to the blood. b) It transports absorbed lipid from the digestive tract to the blood. c) It recognizes and responds to the presence of cancer cells and microbes, d) It returns deoxygenated blood to the heart.
The Correct Answer and Explanation is :
Answers:
- c) interstitial fluid
- a) Both statements are true.
- d) all of the above.
- d) It returns deoxygenated blood to the heart.
Explanation:
1. The composition of lymph most closely resembles: c) interstitial fluid
- Lymph originates from interstitial fluid, which is the fluid that bathes the cells in tissues. Both lymph and interstitial fluid have a similar composition, consisting mainly of water, dissolved solutes, proteins, and white blood cells. Plasma, on the other hand, contains more proteins and different solutes, and intracellular fluid has different ion concentrations and organic molecules compared to interstitial fluid. Synovial fluid is unrelated and found in joints.
2. Lymphatic vessels in the skin follow veins. Lymphatic vessels in the viscera follow arteries: a) Both statements are true.
- Lymphatic vessels generally follow the path of blood vessels for convenience in drainage and flow. In superficial areas like the skin, they parallel veins, whereas in deeper visceral areas, they align with arteries. This pattern facilitates efficient lymph drainage.
3. Lymphatic capillaries are found in tissues throughout the body except for: d) all of the above.
- Lymphatic capillaries are not present in certain tissues, including the red bone marrow, the brain, and the spinal cord. These regions rely on other mechanisms for fluid balance, such as the blood-brain barrier in the central nervous system.
4. Which of the following is NOT the function of the lymphatic system? d) It returns deoxygenated blood to the heart.
- The lymphatic system has three main functions:
- Fluid balance: It collects excess interstitial fluid and returns it to the bloodstream.
- Fat absorption: Lacteals in the digestive system transport lipids to the bloodstream.
- Immune defense: Lymph nodes filter pathogens, and lymphocytes help fight infections.
- Returning deoxygenated blood to the heart is a function of the circulatory system, not the lymphatic system.