While explaining the role of synovial fluid, the instructor rewards which student for identifying an accurate response? Select all that apply

Question

A) Supplies nutrient
B) Forces water out of the cartilage matrix
C) Supplies O2 to chondrocytes
D) Brings cells to phagocytize debris in joints
E) Lubricates the joint

Answer 1

Ans: A, C, D, E
Feedback:
The synovium secretes a slippery fluid with the consistency of egg white called synovial fluid. In addition to supplying nutrients and oxygen to the chondrocytes in the articular cartilage, this fluid serves as a lubricant for the joint. Moreover, macrophages in the synovial fluid act to phagocytize debris in the joint space. Matrix components function as a mechanical spring. When pressure is applied, water is forced out of the cartilage matrix into the synovial fluid. When the pressure is released, water is attracted back into the collagen matrix. These water movements, which are brought about by the use of a joint, are essential for the delivery of nutrients and the exchange of carbon dioxide, oxygen, and other molecules between the synovial fluid and articular cartilage.