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Explore our extensive collection of questions and answers to enhance your learning experience and prepare for exams effectively

A cataract is a dense, cloudy area that forms in the lens of the eye.

A cataract begins when proteins in the eye form clumps that prevent the lens from sending clear images to the retina.

The retina works by converting the light that comes through the lens into signals. It sends the signals to the optic nerve, which carries them to the brain.

Aging is the most common cause.

This is due to normal eye changes that happen starting around age 40.

That is when normal proteins in the lens start to break down. This is what causes the lens to get cloudy.

People over age 60 usually start to have some clouding of their lenses.

The vagus nerve is the longest nerve of the autonomic nervous system and is one of the most important nerves in the body.
The vagus nerve helps to regulate many critical aspects of human physiology, including the heart rate, blood pressure,sweating,digestion and even speaking.
The vagus nerve runs from the brain through the face and thorax to the abdomen.

The cerebellum (Latin for “little brain”) is a major feature of the hindbrain of all vertebrates. Although usually smaller than the cerebrum, in some animals such as the mormyrid fishes it may be as large as or even larger.

The thalamus is a small structure within the brain located just above the brain stem between the cerebral cortex and the midbrain and has extensive nerve connections to both. The main function of the thalamus is to relay motor and sensory signals to the cerebral cortex.

Iris control the size of pupil

The colored part of the eye which helps regulate the amount of light entering the eye.

When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light.

The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.

It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.

A sphygmomanometer, also known as a blood pressure meter, blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure.

Eating salt raises the amount of sodium in your bloodstream and wrecks the delicate balance, reducing the ability of your kidneys to remove the water. The result is a higher blood pressure due to the extra fluid and extra strain on the delicate blood vessels leading to the kidneys.

The longest cells in the human body are neurons. Neurons are cells within the nervous system and carry messages throughout the body.

Neurons never divide or increase in number after you are born. If they are damaged, then also they are not replaced. They remain for the lifetime.

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