eyelash
Definition
Eyelashes are the short, thick hairs that grow on the edges of the eyelids. They are made up of keratin, the same protein that makes up hair, nails, and skin.
Eyelashes are attached to the eyelids by tiny muscles. These muscles allow the eyelashes to move, which helps to keep the eyes clean and protected.
The average person has about 150 eyelashes on each eyelid. The eyelashes on the upper eyelid are longer and thicker than the eyelashes on the lower eyelid.
Eyelashes play an important role in protecting the eyes from dust, dirt, and other small particles. They also help to keep the eyes moist by trapping moisture in the air.
In addition to their protective function, eyelashes can also be a source of beauty. Many people choose to wear false eyelashes to enhance their appearance.
How can the word be used?
Eyelashes are important for protecting the eyes from dust, dirt, and other foreign objects.
Different forms of the word
Noun: eyelash, cilia.
Adjective: eyelashed.
Verb: to eyelash.
Etymology
The word "eyelash" comes from the Old English word æshlesc, which means "eye hair." It was first used in English in the 9th century, and it is still used today to refer to the short hairs that grow on the edge of the eyelids.
Question
Why are eyelashes important?
AQA Science Exam Question and Answer
Question:
Explain the biological function and importance of eyelashes in humans and other animals. Describe the structure of eyelashes and how they contribute to protecting the eyes and enhancing sensory perception. Provide specific examples to support your explanation.
Answer:
Eyelashes serve vital functions in both humans and animals. Structurally, they are short, curved hairs located on the edge of the eyelids. One crucial biological function of eyelashes is to protect the eyes from foreign particles, such as dust, dirt, and insects. When these particles come into contact with the eyelashes, they act as a barrier, triggering a reflex that prompts the eyelids to close, shielding the eyes from potential harm.
Furthermore, eyelashes play a role in sensory perception. They are sensitive to touch and act as a warning system, detecting objects that come too close to the eyes. This rapid response helps prevent potential injuries to the eyes, especially in situations where quick reactions are necessary.
For example, in cats, long and sensitive whiskers, which are a type of specialised hair, act similarly to eyelashes. They assist cats in navigating their surroundings, especially in low light conditions, by providing feedback about their environment through sensory perception.
In conclusion, eyelashes are essential features that contribute to eye protection and sensory awareness in humans and other animals. Their role in preventing harm to the eyes and enhancing sensory perception demonstrates their biological significance.