What is a Jackobson’s organ
rubabOlfactory senses are better developed in reptiles than in amphibians. In addition to having more olfactory epithelium, most reptiles (except crocodilians) possess blind-ending pouches that open into the mouth These …
Write a note on taste buds
Taste buds are barrel-shaped clusters of chemoreseptor cells called gustatory cells and supporting cells arranged like alternating segments of an orange. Extending from each receptor cell are gustatory hairs that…
What is rhodopsin, and how does it functions?
What is rhodopsin, and how does it functions? Ans. Both rods and cones contain light sensitive pigments known as rhodopsins. Each rhodopsin molecule consists of a large protein, opsin, which…
What animals possess a median eye?
Vision is the dominant sense in most reptiles, and their eyes are similar to those of amphibians. Upper and lower eyelids, a nictitating membrane, and a blood sinus protect and…
Describe the structure of vertebrate eye.
All vertebrates possess complex camera eyes. A camera-type eye contains in the front a light-tight chamber and lens system, which focuses an image of the visual field on a light…
Write a note on mechanoreceptors (tactile receptors) in the skin
Many animals rely on tactile (pertaining to touch) stimuli to obtain information about their environment. Mechanical sensory receptors in vertebrate skin detect stimuli that the brain interprets as light touch,…
Structure of human ear and process of hearing and equilibrium in man
Structure of human ear The human ear has three divisions: the outer, middle, and inner ear. The outer ear consists of the auricle and external auditory canal. The middle ear…
Sound reception (hearing) in an anuran (frog) mechanism
The ears of anurans (frogs) consist of a tympanum, a middle ear and an inner ear. The tympanum vibrates in response to sound waves and transmits these movements to the…
Why is the tympanic membrane important to life on land?
Hearing may initially have been important to vertebrates as a mechanism to alert them of any dangerous activity around them. It also became important in the search for food and…
Compare a complex camera eye of invertebrate with that of a vertebrate eye.
The eyes of cephalopods (squids, such as octopuses, cuttle fishes) are often compared to those of vertebrates because both types contain a thin, transparent cornea, and a lens that focuses…