Question

Humans infected with some types of parasitic worms develop a condition called elephantiasis, which is characterized by swelling of the limbs. Which of the following would be the most likely cause of elephantiasis?

A) The infected human's immune system is fighting the worms.

B) The worm infection is causing a decrease in cardiac output.

C) The worms are blocking the lymph vessels.

D) More blood is flowing through precapillary sphincters.

Answer 1

Ans:

Humans infected with some types of parasitic worms develop a condition called elephantiasis, which is characterized by swelling of the limbs. The following would be the most likely cause of elephantiasis: C) The worms are blocking the lymph vessels.

Explanation:

- Elephantiasis is caused by the filarial worm.

- It is transmitted from human to human via the female mosquito when it takes a blood meal.

- As the parasites accumulate in the blood vessels, they can restrict circulation and cause fluid to build up in surrounding tissues.

- The symptoms may include blocked lymph ducts.

- Hence, correct option is: C) The worms are blocking the lymph vessels.