What is a key function of the lymphatic system in cardiovascular homeostasis?

What is a key function of the lymphatic system in cardiovascular homeostasis?

• A. It pumps blood through capillaries
• B. It returns interstitial fluid to circulation, maintains plasma protein balance, reduces edema; drains proteins and fats
• C. It filters blood in the spleen
• D. It secretes plasma proteins into the bloodstream

Answer: (B)

In cardiovascular homeostasis, maintaining proper blood volume and fluid distribution is essential. The lymphatic system accomplishes this by returning excess interstitial fluid to the bloodstream, which helps preserve circulating volume. It also drains proteins that have leaked into the interstitial space back into the circulation, supporting plasma protein balance and maintaining the osmotic pressure that keeps fluid in the vessels. By removing excess fluid, it reduces edema, and by carrying absorbed fats from the gut via intestinal lymphatics, it helps coordinate nutrient transport with circulation. Pumping blood through capillaries is the job of the heart; filtering blood in the spleen is a splenic, not lymphatic, function; and secreting plasma proteins into the bloodstream is a product of other organs like the liver.

In cardiovascular homeostasis, maintaining proper blood volume and fluid distribution is essential. The lymphatic system accomplishes this by returning excess interstitial fluid to the bloodstream, which helps preserve circulating volume. It also drains proteins that have leaked into the interstitial space back into the circulation, supporting plasma protein balance and maintaining the osmotic pressure that keeps fluid in the vessels. By removing excess fluid, it reduces edema, and by carrying absorbed fats from the gut via intestinal lymphatics, it helps coordinate nutrient transport with circulation.

Pumping blood through capillaries is the job of the heart; filtering blood in the spleen is a splenic, not lymphatic, function; and secreting plasma proteins into the bloodstream is a product of other organs like the liver.