Sense Organs Flashcards
State the location of the eye
The two eyes are located in deep sockets of orbits of the front side of the head
Why is blinking necessary
The two movable upper and lower highlights protect the eye from any kind of injury and clean the surface of the iBall by regular blinking
State the location of the tear gland or the lacrimal gland
Located at the upper side word portion of the orbit are present that tear or lacrimal glands
What makes up the white portion of the eye
SClera makes the white portion of the front eye
State the coloured part of the eye and what covers it
The cornea and it is covered by the
Sclera
How and why could excessive use of contact lenses lead to drying of the cornea
Cornea drives oxygen by diffusion therefore excessive use of contact lenses is not recommended as it could lead to drying of the cornea
The pigmented circular area seen in the eye
Iris
The contraction of which muscles help in the alteration of focal length of the eye lens
Ciliary muscles
The most sensitive region of the retina
The yellow spot
The innermost layer of the eye
Retina
The area where the images formed but not seen by eye
The blind spot
region the eye where the rods and the cones
Retina
The part of the eye that is responsible for the change in the size of the pupil
Iris
Fluid present in the posterior Chamber of the eye
Vitreous humour
The defect of the human eye caused due to the uneven surface of the cornea
Astigmatism
The type of lens used for correcting myopia
Biconcave
A condition during which a person feels difficulty while seeing in dim light
Night blindness
Name the photo receptors found in the retina of the eye
Rods and cons
The layer of the iBall that forms the transparent cornea
Sclera
The ear ossicle is in contact with the oval window of the inner ear
Stapes
Name the three ear ossicles of the ear
Malleus , incus, stapes
The biological term used collectively for the three small bones present in the middle ear
Ear ossicle
Name the part of the ear associated with static balance
Utriculus and sacculus
Name the part of the ear associated with hearing
Cochlea
Name the part of the ear associated with dynamic balance
Semi circular canals
The part of the eye which is responsible for its shape
Sclera
The part of the eye that prevent the eyeBall from collapseing
Vitreous humour
The part of the retina on which the images focus for the clearest vision
Yellow spot
The ability of e y e adjust its focal length in order to obtain a clear vision of objects are different distance
Accommodation of the e y e
A defect in the E Y E due to which some part of the object is seen clearly while other same blurred
Astigmatism
e y e defect due to which two eyes some what converge leading to what is called cross eye
Squint
The nutritive layer of e y e also prevents the reflection of light
Choroid
The fluid which conveys the vibration of sound in the cochlea and the semi circular canal
Endolymph
A technical term for the structure found in the inner e a r
Membraneous labyrinth
The receptors which help in the sensation of taste
Sensory papillae
Enability of eye to focus on nearby objects due to the loss of elasticity of lens with age
Presbyopia
Hypermetropia can be corrected using a
Biconvex lens
Tympanic chamber is filled with what fluid
Perilymph fluid
Location of the Iris
In the eye behind the cornea
Location of the Yellow spot
Near the centre of the retina
Location of the organ of corti
In the cochlea of the ear
Location of the pinnae
Side of the head
Location of the eustachian tube
Between the middle ear and the pharynx
Location of the semi circular canals
In the internal ear
State the function of cornea
It covers and protects the Iris and allows the entry of light rays into the eye
State the function of iris
It controls the size and the diameter of the pupil according to the intensity of the illumination
State the function of aqueous humour
It allows light rays to pass into the eye and prevents the refraction and dispersion and keeps the lens moist
State the function of choroid
It has many capillaries forms the nutritive layer of the retina and absorbs light rays to avoid reflection
State the function of cochlea
It is the organ of hearing
State the function of visual purple
It has a vitamin A derivative that helps the eyes to see in the dim light
State the function of conjunctiva
It supplies nourishment to the eye and prevents infection it covers the cornea and lines inside of the eyelid
State the function of vitreous humour
It maintains the shape of the eyeball
State the function of suspensary ligaments
There fibres that hold the lens in position
State the function of ear drum
It vibrates according to the sound waves and transmits Dem across the middle ear
State the function of ear ossicles
Amplifier the vibrations of the ear drum and transmit them to the delicate membrane stretched along the oval window
State the function of semi circular canals
They are concerned with maintaining the equilibrium and the posture of the
State the function of endolymph
It transmits vibration to the hair cells of the inner ear to produce acoustic perception
State the function of eustachian tube
It equalises air pressure on the ear drum from the inside
State the function of tears
Tears clean the front surface of the eye by removing dust particles and enzyme lysosome present in tears kill the germs
Describe cataract
It is a condition in which the lens turns Opaque and the vision is cut down even total blindness it can be corrected by surgically removing the lens and replacing with artificial one and also using spectacles with high convex lens
Differentiate between vitreous humor and aqueous humour
Vitreous humor has high specific gravity aqueous humor has low specific gravity a human is found between the retina and the lens of the posterior eye Aquasure is found between the cornea and the length of the anterior in the eye
Difference between short citedness and long sightedness
The images fall in front of retina the images fall beyond the retina short sightedness is corrected by using glasses of concave lens long sightedness is corrected by using glasses of convex lens
Differentiate between rods and cons
Rods contain Rodopsin and cones contain idopsin
Differentiate between retina and choroid
It is the innermost layer of the iBall is the middle layer of the iBall tunics retina contains neurons, choroid contains blood capillaries
Differentiate between cochlear and concha
Cochlea is the part of inner ear and conceal is that ear pinna of cartilage
Cochlea is associated with hearing and concha collects the wound waves
