Question

Question was provided via image upload.

Explanation:

Identify the core question

The question asks "Which is true of collagen?". Only one option is visible: "Collagen is excitable." We need to evaluate this statement and determine the correct physiological properties of collagen in the context of muscle and connective tissue.

Evaluate the visible option

Excitability is a property of muscle fibers and neurons, allowing them to respond to electrical or chemical stimuli. Collagen is a structural protein, not an excitable tissue. Therefore, "Collagen is excitable" is false.

Determine true properties of collagen

Collagen is a major component of the extracellular matrix and connective tissues (such as epimysium, perimysium, and endomysium in skeletal muscle). It is extremely tough, resists excessive stretching, and provides structural strength and Muscle Passive Tension when a muscle is stretched. It is elastic but not excitable or contractile.

Formulate the correct answer

Since the image is cropped and does not show all options, we will provide the correct physiological facts about collagen to address the question "Which is true of collagen?" and explicitly mark the visible incorrect option.

Answer:

Question 1

• (A) Collagen is excitable.
• (B) Collagen is inert, resists stretch, and provides passive tension. (Correct answer)