🔬 Biology · Locomotion and Movement · NEET

The small fluid-filled sac that reduces friction at joints such as the knee is the:

Answer: Bursa.

A Sarcomere
B Bursa
C Ligament
D Cartilage pad

Correct answer: B. Bursa

Explanation: A bursa is a fluid-filled sac that cushions and reduces friction between moving parts at a joint.

Structure of a sarcomere showing thick myosin filaments and thin actin filaments with the Z line, M line, A band, I band and H zone labelled

A sarcomere (Z line to Z line): during contraction the I band and H zone shorten as thin filaments slide over thick, while the A band stays the same length. Image: SlothMcCarty, CC BY-SA 3.0, via Wikimedia Commons.

Concept context

Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.

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The small fluid-filled sac that reduces friction at joints such as the knee is the:

Concept context

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