Question

Which of the following are NOT the age-related physiological changes?

• A. Reduction in size of slow twitch Type I fibres
• B. Loss of motor neurons
• C. Reduction in size of fast twitch Type II fibres
• D. Increase in non-contractile tissue
• E.

Hint:

Age-related changes in muscle fibers and neurons contribute to reduced strength and coordination as we get older.

Answer 1

The Correct Option is D

Step 1: Identify Age-Related Physiological Alterations.
With aging, physiological modifications manifest in muscle fibers, motor neurons, and connective tissues, characterized by decreased muscle mass, fiber dimension, and motor neuron count. Step 2: Evaluate Each Option.
- (1) Diminution of slow-twitch Type I fibers: Accurate. Aging is associated with a decrease in the size of Type I fibers, crucial for endurance and low-intensity activities. - (2) Attrition of motor neurons: Accurate. Motor neuron loss is a consequence of aging, impacting muscle control and coordination. - (3) Reduction in fast-twitch Type II fiber size: Accurate. Fast-twitch fibers, responsible for rapid, forceful movements, also experience size reduction with age. - (4) Augmentation of non-contractile tissue: Inaccurate. While non-contractile tissues like adipose and connective tissue do increase with age, this is not classified as a standard physiological adaptation of aging in the same category as muscle and neural changes. Step 3: Final Determination.
Option (4) is the correct designation, as the increase in non-contractile tissue is not typically categorized as a physiological change directly related to aging concerning muscle function.