Epidermis

sweat gland

Melanin

sebaceous glands

The correct answer is D. Sweat helps in the regulation of our body temperature by removing the excess heat in our body. When our body produces sweat, it begins to cool down.

D. sweat

The correct answer is A.

Our fingernails, toenails and hair are composed of dead cells with keratin in them.

A. keratin

The correct answer is B.

The correct order (inner to outer) of the structure of the skin is subcutaneous layer, dermis, and epidermis. The subcutaneous layer, which is beneath the dermis, is made up of fat and connective tissues. On the other hand, the dermis layer is the thick skin layer that is located under the epidermis. The epidermis is the outer thinner layer of the skin.

B. subcutaneous layer, dermis, epidermis

The correct answer is C.

Skin cancer is often caused by excessive or intense exposure to the sun’s UV rays. When the sunlight hits our skin cells, it damages the DNA in it and increases the risk of developing cancer.

C. skin cancer

The UV rays from 10 in the morning until 4 in the afternoon are very intense; hence, avoid exposure during these hours. If it can be avoided, then it is best to wear additional layers of clothing and apply sunblock to protect the skin against the harmful effects of the sun.

To treat acne, the following methods are done:
1. Wash you face twice a day using a gentle cleanser.
2. Apply medication or treatments that are prescribed by dermatologists.
3. Avoid wearing make up and applying oil-based products.
4. Avoid touching and pricking the acne.

Eating a balanced diet would allow your body to get the nutrients that it needs. As a result, the cells in our body would be in its top form, thus promoting the healthy growth of our hair. In the event that our body does not receive sufficient amounts of nutrients, then our hair can become thin, dry, and brittle.

The features that make a mole on the skin suspicious include the following:
1. Asymmetry: If an imaginary line is drawn at the center and the mole does not produce matching halves, then it is suspicious.
2. Border Irregularity: Suspicious moles have irregular edges.
3. Color: The mole contains an intense black color. In some cases, a bluish tint can be also observed, whereas some would show an uneven color.
4. Diameter: If the diameter of the mole is wider than the width of a pea, it is suspicious.

Warts that are found on the hands, feet, and face are caused by a virus infection. They are usually spread or transferred through direct contact with another wart of a person.

On the other hand, moles are small, slightly raised spot on the skin that has a dark pigment due to a high concentration of melanin. It is often harmless, however, some may develop into melanoma.

The correct answer is periodontium. This is the area that surrounds the teeth, such as the gums, jawbone, and the periodontal ligaments.

The correct answer is pulp. The pulp, which is located at the center of the tooth, contains the connective tissues, blood vessels and the nerves.

The correct answer is plaque. The term plaque is used to describe the deposit of bacteria and small food particles that adhere to the tooth.

The correct answer is periodontal disease. A periodontal disease refers to the inflammation of the gum, bone, and tissues of the teeth. This is often caused by the build up of bacteria in the mouth.

The correct answer is B. The acids produced by the bacteria are responsible for breaking down the tooth enamel.

B. bacteria

The correct answer is A. Foods that are rich in phosphorus and calcium keep our gums and teeth healthy.

A. phosphorus and calcium

The correct answer is D. Malocclusion, which is also known as bad bite, is the misalignment of the teeth.

D. a misalignment of teeth

The correct answer is A. The dentin is the layer beneath the enamel. This layer serves to protect the pulp cavity.

A. dentin

The two functions of the teeth include:
1. Breaking down of foods into smaller pieces
2. Helping form the shape and structure of the mouth

Since brushing is not enough, it is best to use floss in order to remove the plaque in areas that cannot be reached by the bristles of a toothbrush. In this way, cavities can be prevented.

Bacteria does not only exist on our teeth. They are also found on the tongue. In this case, brushing the tongue is important in preventing the bacteria from building up in the mouth.

In the event that gingivitis is left untreated, then it may cause the tooth to be lost. This occurs because the bone and the tissue that supports it are already destroyed due to bacterial infection.

Malocclusion, which is also known as a bad bite, is the misalignment of the teeth. If the teeth are misaligned, then it would increase the plaque accumulation on the teeth due to the grooves, pits, and crannies that can collect food particles. Eventually, when the plaque hardens, it causes tooth decay.

The correct answer is sclera. Sclera is the tough, white outer part of the eyeball.

The correct answer is retina. The retina is the layer found at the back of the eye. It contains millions of cells that are sensitive to light.

A 1 inch long passageway leading from the outer ear to the eardrum is called external auditory canal.

None of what was offered.

The correct answer is tinnitus. Tinnitus is a condition wherein a ringing or buzzing sound is heard even where there is no external source of sound.

The correct answer is A. The tears in our eyes keep our eyeballs moist and clean.

A. moisten and clean the eye

The correct answer is D. Glaucoma occurs when there is a presence of high pressure inside the eye. This damages the retina and optic nerve, which may result in impaired vision.

D. glaucoma

The correct answer is A. The lens of our eyes are responsible for refining the focus of images or refracting the light onto the retina.

A. the lens

The correct answer is A. The vestibule and the semicircular canals are responsible for controlling our balance. In order to maintain our balance, the receptor cells in these structures send signals to our brain through nerve impulses.

A. semicircular canals and vestibule

The correct answer is D. According to health care professionals, we must not put any foreign object in our ear canal.

D. None of the above

In order to protect your hearing in the future, we can do the following things:
1. Have a regular ear examination done by a health care professional.
2. Wear protective clothing such as hats and earmuffs that would cover your ears during the cold winter.
3. When playing contact sports, wear a helmet to protect your head, especially your ears.
4. Avoid putting foreign objects inside the ear canal.

Strabismus is a condition that is characterized by eyes that are turned inward or outward; hence, making them appear off-center or cross-eyed. This is caused by weak eye muscles.

The structure of the eye that has no solid mass is the pupil. This is the hole where light passes through in order to reach the inner portion of our eyes.

The correct answer is conductive hearing loss. This type of hearing loss is caused by either a blockage or an injury in the inner ear. In this case, it is likely that a buildup of earwax can cause a blockage in the inner ear.