Fluid-filled sacs intended to minimize friction between tissue and bone can become inflamed: when this happens, the conditioon is called:
a. sprain
b. myalgia
c. tendinitis
d. bursitis

The correct answer is D. Fluid-filled sacs intended to minimize friction between tissue and bone can become inflamed: when this happens, the condition is called bursitis.

Explanation:

Bursitis is the inflammation of the bursa, a bag-shaped structure that is located between bones, tendons and muscles, aimed at facilitating the movement of these structures with each other.

Due to the inflammatory process the bursa begins to accumulate a significant amount of liquid. This condition can be acute or chronic. Commonly, it occurs in the area of the shoulder, knee, elbow, hip or Achilles tendon.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands