Which statement is true about the lens capsule?

Which statement is true about the lens capsule?

• A. The lens capsule is semipermeable and receives nutrition from the aqueous humor
• B. The lens capsule is vascular
• C. The lens capsule regenerates blood
• D. The lens capsule is impermeable to all molecules

Answer: (A)

The lens relies on diffusion from the aqueous humor for its nutrients because it has no blood vessels. The lens capsule, a basement membrane surrounding the lens, is semipermeable. That means it allows small molecules—water, ions, glucose and other nutrients—to diffuse from the aqueous humor into the lens tissue to nourish the lens fibers. This combination explains why the capsule is described as semipermeable and as receiving nutrition from the aqueous humor. It’s not vascular, so it doesn’t generate blood, and it’s not impermeable to all molecules; it selectively permits diffusion of small solutes while restricting larger ones.

The lens relies on diffusion from the aqueous humor for its nutrients because it has no blood vessels. The lens capsule, a basement membrane surrounding the lens, is semipermeable. That means it allows small molecules—water, ions, glucose and other nutrients—to diffuse from the aqueous humor into the lens tissue to nourish the lens fibers. This combination explains why the capsule is described as semipermeable and as receiving nutrition from the aqueous humor. It’s not vascular, so it doesn’t generate blood, and it’s not impermeable to all molecules; it selectively permits diffusion of small solutes while restricting larger ones.