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Answer:
Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity. Cones are active at higher light levels (photopic vision), are capable of color vision and are responsible for high spatial acuity
The iris is the colored circle surrounding the pupil. It changes the size of the pupil and allows different amounts of light to enter the eye. ... The pupil is the round, black circle in the center of the iris and is actually a hole through which light passes to the retina.
pinna is cartilagenous structure that is formed of skin and Elastic cartilage, it collect sound waves in direct them into auditory canal. tympanum is the external ear separated from middle ear by membrane structure called as a ear drum or tympanum.
Nasal cavity Ear canal
It helps in smelling. It helps in hearing.
It acts as a barrier for dust particles. It also helps in balancing.
Answer:
Rods and Cones are the photoreceptors found in the eye, rods have rod-like structure and provide twilight vision, while cones are of the cone shape, fewer in number and provides the vision in the day or bright light.
Rods are found around the boundary of the retina, whereas cones are there in the centre of the retina.
Out of the 125 million photoreceptors, rods are about 120 million in the human eye and cones are 5 million photoreceptors.
The outer segment is cylindrical of rods which contain rhodopsin pigment, made up of Vitamin A, while the outer segment is conical of cones which contain iodopsin pigment.
Cones provide colour vision, which is of three types: red, blue and gree, whereas rods cells do not give colour vision, they do not have any differentiation.
Lack of the rhodopsin in the rods may cause night blindness, while lack of the iodopsin in the cones may cause colour blindness.
Rods provide the vision in the dull light (darkness or night), whereas cones are known to give the vision during the day or bright light.
The pupil is the central opening of the iris on the inside of the eye, which normally appears black. The grey/blue or brown area surrounding the pupil is the iris. ... The central outermost transparent colorless part of the eye (through which we can see the iris and pupil) is the cornea.
Pinna is cartilagenous structure that is formed of skin and Elastic cartilage, it collect sound waves in direct them into auditory canal. tympanum is the external ear separated from middle ear by membrane structure called as a ear drum or tympanum.
