Questions: Changes in collagen in joints due to aging results in — Multiple Choice joint stiffness inflammation and pain increased flexibility

The answer is the first one: joint stiffness.

Explanation for each option:

1. Joint stiffness: As people age, the collagen in their joints undergoes changes that can lead to a decrease in elasticity and an increase in stiffness. This is a common effect of aging on the joints, making this option correct.

2. Inflammation and pain: While aging can contribute to joint pain and inflammation, these symptoms are more directly associated with conditions like arthritis rather than changes in collagen alone. Therefore, this option is not the most accurate answer to the question.

3. Increased flexibility: Aging typically results in decreased flexibility due to changes in collagen and other factors affecting the joints. Increased flexibility is not a common result of aging, making this option incorrect.

In summary, the changes in collagen in joints due to aging most commonly result in joint stiffness.