Question
Biology Question on neural control and coordination
Which of the following is correct for lens focussing while seeing distant object ?
A
Relaxed ciliary muscles and taut suspensory ligament
B
Taut suspensory ligament and rounded lens
C
Contracted ciliary muscles and relaxed suspensory ligaments
D
Contracted ciliary muscles and rounded lens
Answer
Relaxed ciliary muscles and taut suspensory ligament
Explanation
Solution
Human eyes have remarkable power of accommodation by changing the convexity of the lens. Due to action of the muscles of ciliary body and suspensory ligament the focal length of the lens can be changed. Then the objects can be focused in different intensity of light from varying distances. For accommodation of distant objects, ciliary muscles are relaxed and suspensory ligaments are tightly stretched.