Select the correct information about lymphatic flow:
1. The abdominal region is where lymph flows with higher pressure.
2. The skeletal muscle relaxation compresses lymphatic vessels (as well as veins).
3. The force of muscular relaxation forces the lymph towards the junction of the jugular and subclavian veins.
4. Lymph flow is also maintained by pressure changes that occur during expiration.
Answer (2)
Lymphatic flow operates mainly at lower pressures, with skeletal muscle contractions being vital for its propulsion. The only correct statement is that lymph flow is maintained by pressure changes occurring during expiration. This pressure change assists in drawing lymph into the circulatory system.
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The question is about the lymphatic flow, which is part of the lymphatic system in the human body. This system is crucial for maintaining fluid balance, defending against infections, and supporting the absorption of dietary fats. Let's analyze each statement:
The abdominal region is where lymph flows with higher pressure. This statement is incorrect. The lymphatic system is a low-pressure system, and lymph flow is generally slower and at lower pressure compared to the circulatory system. Lymph flow isn't specifically higher in pressure in the abdominal region.
The skeletal muscle relaxation compresses lymphatic vessels (as well as veins). This statement is incorrect. Skeletal muscle relaxation would not compress lymphatic vessels. Instead, when skeletal muscles contract, they help to compress lymphatic vessels, aiding in moving lymph through the vessels, acting almost like a pump.
The force of muscular relaxation forces the lymph towards the junction of the jugular and subclavian veins. This statement is incorrect. It is actually the contraction of muscles, not relaxation, that helps push lymph towards larger collecting ducts and eventually back into the bloodstream at the junction of the jugular and subclavian veins.
Lymph flow is also maintained by pressure changes that occur during expiration. This statement is incorrect. Lymph flow is assisted by the pressure changes that occur during inspiration, not expiration. Inspiration decreases thoracic pressure, helping move lymph toward the thoracic duct and ultimately into the venous circulation.
To sum up, none of the statements provided contain correct information regarding lymphatic flow.
