NEET BIOLOGY

Detailed explanation-1: -The iris of the eye is made up of smooth mucles. The movement of iris in the eye is an involuntary action.

Detailed explanation-2: -The iris, via the sphincter pupillae, is a part of the accommodative reflex. The accommodative reflex of the eye is an involuntary response when the visual focus switches from an object at a distance to one that is closer.

Detailed explanation-3: -Iris has involuntary smooth muscle. Biceps of upper arm have striated muscle fibres and abdominal wall has involuntary smooth muscles.

Detailed explanation-4: -The iris is made of muscles and nerves. The nerves and muscles in your iris work on their own without you thinking about them (parasympathetically) to control the size of your pupil. Your iris is filled with a fluid called aqueous humor.

Detailed explanation-5: -The iris is made up of tissue and smooth muscle fibers. It is these tissues and muscles that cause it to expand and contract. The sphincter pupillae surrounds the border of the pupil and controls the iris contracting in size. The muscle that causes the iris to expand is called the dilator pupillae.