BIO NMDCAT Receptors

nmdcat.online July 7, 2026

The adjustment of the lens shape to focus on near objects is mediated by the

A. Contraction of the ciliary muscle

✓

B. Relaxation of the ciliary muscle

C. Dilation of the pupil

D. Contraction of the iris sphincter

📝 Explanation

To focus on near objects (accommodation), the ciliary muscle contracts, acting like a sphincter. This releases tension on the suspensory ligaments, allowing the elastic lens to bulge and become more convex.

📖 Additional Information

Contraction of the ciliary muscle
Relaxation of the ciliary muscle
Dilation of the pupil
Contraction of the iris sphincter

To focus on near objects (accommodation), the ciliary muscle contracts, acting like a sphincter. This releases tension on the suspensory ligaments, allowing the elastic lens to bulge and become more convex.

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