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Why do people sneeze when walk into bright sunlight?
That is because of how some people's nerves are routed. For some, the optic nerves are very close to the vagus nerve and may even share the same nerve sheath. The vagus nerve is what controls the heart, lungs, diaphragm, part of the vocal folds, and digestive tract. A sneeze is a spasm of the diaphragm. So when a very strong stimuli passes through the optic nerve, some crosstalk may occur and stimulate the vagus nerve, causing a spasm of the diaphragm and the sudden expulsion of air through the lungs and out the mouth. So if the mouth or lungs have anything in them at the time, it comes out along with the air, and thus saliva and possibly phlegm go everywhere.
Dark in color and is the hole in the colored part of the eye?
Pupil?
When the light is bright the iris open so the pupil become?
Smaller.
How do light rays travel to your eye from a lighted candle?
through pupil
What is the tiny hole in the middle of your eye?
The tiny hole in the middle of your eye is your pupil
What controls how much light enters the pupil?
The size of pupil is reduced with bright light and vise verse. This is managed by reflex action. Parasympathetic nerve stimulation constricts the pupil. Sympathetic nerve stimulation dilates the pupil.
What part of your nrvous system controls open and close pupil?
The third cranial nerve.
What cranial nerve controls the response of the illuminated eye?
If the light is shining directly into one eye, then the pupil in that eye will constrict (a direct response), but so will the pupil in the non-illuminated eye (a consensual response). This reflex involves two cranial nerves: the optic nerve, which senses the light, and the oculomotor nerve, which constricts both pupils.
Where is the iris located?
The iris is the layer that surrounds the pupil and controls the size and diameter of the pupil. It also controls the amount of light that reaches the pupil.
What cranial nerve is not in involved in either taste or smell?
Optic Nerve = Vision Oculomotor Nerve = Eye movement; pupil constriction Trochlear Nerve = Eye movement Trigeminal Nerve = Somatosensory information (touch, pain) from the face and head; muscles for chewing. Abducens Nerve = Eye Movement Vestibulocochlear Nerve = Hearing; balance Vagus Nerve = Sensory, motor and autonomic functions of viscera (glands, digestion, heart rate) Spinal Accessory Nerve = Controls muscles used in head movement. Hypoglossal Nerve = Controls muscles of tongue
What structure is the visible colored part of the eye that controls pupil dilation?
The visible, colored part of the eye that controls pupil dilation is the iris.
Is it possible to break your pupil?
Eye trauma can damage the muscle that controls pupil size.
What controls automatic eye movements?
it is the pupil
What is the circular opening of the eye which controls the amount of light that enters the eye?
The pupil. However, as it is a hole, i.e. an absence of anything it seems odd to say it controls anything. The iris controls the size of the pupil and therefore the amount of light entering.
What contains muscle that controls the size of the pupil?
iris
What does the pupil in the human eye do?
The pupil is the opening in the iris. The iris controls the amount of light entering the eye.
What controls the amount of light reaching the retina?
the iris controls the amount of light by limiting the volume of light admitted through the iris.
