Tag: human brain and sense organs

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Questions Related to human brain and sense organs

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Supporting cells of retina is

  1. Dieters cells

  2. Hensen's cells

  3. Muller cells

  4. Amacrine cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Supporting cells of the retina is Muller cells also known as Muller glia. They are a type of retinal glial cells, first recognized and described by Heinrich Muller. They are found in the vertebrate retina, which serves as support cells for the neurons of the retina.

The major function of the Müller cells is to maintain the stability of the retinal extracellular environment by regulation of K+ levels, uptake of neurotransmitters, removal of debris, storage of glycogen, electrical insulation of receptors and other neurons, and mechanical support of the neural retina. So, the correct answer is option C.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Pigmented layer in eye is called as

  1. Cornea

  2. Sclerotic

  3. Choroid

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The retina makes up the inner layer and occupies only the posterior two-third of the eye. The retina consists of several layers of cells, including the rods and cones, the sensory cells, that respond to light. The tips of the rods and cones are embedded in a pigmented layer of cells on the back of the retina. The pigment helps prevent light from scattering in the back of the eye. 

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Largest eyes amongst land animals is of

  1. Elephant

  2. Deer

  3. Ostrich

  4. Man
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ostriches have the biggest eyes of all land mammals. The ostrich needs large eyes for its terrestrial lifestyle sharing the savanna as it does with an alarming army of fearsome predators. It is a flightless bird with strong hindlimbs to run.

So, the correct answer is option C.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Meibomian gland are associated with 

  1. Eyes

  2. Ears

  3. Reproductive organ

  4. Skin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The meibomian glands (or tarsal glands) are a special kind of sebaceous gland at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance, that prevents evaporation of the eye's tear film. Meibum prevents tear spillage onto the cheek, trapping tears between the oiled edge and the eyeball, and makes the closed lids airtight. There are approximately 50 glands on the upper eyelids and 25 glands on the lower eyelids. Dysfunctional meibomian glands often cause dry eyes.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

The black pigment in the eye, which reduces the internal reflection is located in

  1. Retina

  2. Iris

  3. Cornea

  4. Sclerotic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Retina is the light-sensitive tissue lining the back of our eye. It is the black pigment in the eye, which reduces the internal reflection. Thereby, it controls the impact of the bright light entering our eye. Function of retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition. Hence option A is correct.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Eye lashes are lubricated by

  1. Ceruminous gland

  2. Pituitary gland

  3. Lacrimal gland

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The almond-shaped glands in the eyes present above each eyeball are called lacrimal glands. Thes glands are called tear gland because they secrete the fluid called tears. These glands have their openings between the eyelashes. Water, salts and bactericidal protein such as lysozyme are components of tear. The secretion of this glands is involved in the clearance of dust, grit and microorganisms in the cornea. They are also involved in the lubrication of eyes and eyelashes. Thus the correct answer is option C.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Which of the following statements about rods and cones is true?

  1. Rods are responsible for photopic vision and cones are responsible for scotopic vision.

  2. Rods are responsible for scotopic vision and cones are responsible for photopic vision.

  3. Rods and cones both are responsible for photopic vision.

  4. Rods and cones are responsible for scotopic vision.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rods and cones are photoreceptors in the human retina. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate colour vision and have a low spatial acuity. Cones are active at higher light levels (photopic vision), are capable of colour vision and are responsible for high spatial acuity. So, the correct answer is 'Rods are responsible for scotopic vision and Cones are responsible for photopic vision'.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Iodopsin is a light sensitive (photosensitive) pigment and is present in the

  1. Rods

  2. Cones

  3. Neuroglia

  4. Bipolar cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rods and cones are used to process light, in a human eye, their number is estimated to be 5-7 million cones and 110-130 million rods. Cones have iodopsin and are found mainly in the central area of the retina (fovea), while rods containing rhodopsin are found in the peripheral retina. Cones sense colour and need more light than rods to work well. Cones are most helpful in the normal or bright light. There are 3 types of cones - red, green, and blue - to help you see different ranges of colour. Together, these cones sense combinations of light waves, that enable our eyes to see millions of colours. The light-sensitive photopigments are made of the protein opsin and the chromophore retinene. Bleaching of iodopsin in cones is similar to rhodopsin in rods, only rods contain a higher concentration of visual pigment than cones, so more light is needed to cause an action potential to be fired in cones ( a threshold for cones is higher than rods). In other words, rods are mainly used for dim light vision, cones for bright light vision.