It is the main airway to the lungs, connecting the mouth and nose to the lungs.

Question

It is the main airway to the lungs, connecting the mouth and nose to the lungs. a. Pharynx b. Esophagus c. Trachea d. Epiglottis e. All of the above f. None of the above The skin is composed of three primary layers, which layer provides waterproofing and serves as a barrier to infection a. Dermis b. Epidermis c. Epithelial d. Subcutaneous e. All of the above f. None of the above Most of the cells in your epidermis (95%) work to make new skin cells. The other 5% make a substance which gives skin its color. The name of the substance is: a. Sweat b. Sebum c. Cerumen d. Melanin e. All of the above f. None of the above These tiny air sacs are located at the ends of the bronchioles. It is within these structures that the oxygen from the air enters the blood, and carbon dioxide from the blood enters the lungs. a. Bronchi b. Alveoli c. Bronchioles d. Trachea This inner layer of the epidermis creates the dead cells that we can see. a. Stratum corneum b. Subcutaneous layer c. Malpighian layer d. Eumelanin layer e. All of the above f. None of the above

Explanation / Answer

1. e All of the above options are correct. starting from the nose and mouth there is pharynx,epiglottis, esophagus, trachea and then lungs.

2. b. Epidermis layer. It is the outermost layer of skin.

3. d. Melanin. It is responsible for skin color.

4. b. Alveoli are the small sacs where gas exchange takes place.

5. a. Stratum corneum is the outermost layer of the epidermis which contains dead cells.

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