Flexibility is defined as the ability to move a joint through available range of motion, influenced by ...?

• A. Muscle tightness, scar tissue, tissue extensibility.
• B. Cardiac output and blood pressure.
• C. Lung capacity and diffusion.
• D. Bone density and mineral deposition.

Answer: (A)

Flexibility is about how far a joint can move within its available range, and that mainly depends on the properties of the muscles and surrounding connective tissues. When muscles are tight, they resist lengthening and limit ROM. Scar tissue from injuries tends to be less elastic, forming bands that restrict movement. Tissue extensibility is the ability of tissues—muscle, tendon, fascia, and related structures—to stretch; higher extensibility allows a joint to move more freely. These tissue-related factors directly shape how far a joint can move, more so than cardiovascular measures like heart output or lung capacity, or bone-related factors like density. So the combination of muscle tightness, scar tissue, and tissue extensibility best explains flexibility.