Question

1. Lamellar granules release a water-repellant sealant onto the surface of the keratinocytes.

True

False

2. _______ perspiration is water loss that cannot be seen and occurs through evaporation of water from the interstitial fluid and sweat gland pores.

3. Which one of the following is not correct about beta-carotene?

It is used by the body to produce vitamin A.

It is stored in fatty areas with other water-soluble chemicals.

It is yellow-orange in color.

It is obtained through the diet.

4. Vitamin D3 will cause the intestines to absorb more calcium from food.

True

False

5. Which one of the following is not true about sebaceous glands?

Their secretion inhibits bacterial growth on the skin.

The majority secrete their secretion directly to the skin surface.

Their secretion consists of lipids, proteins, and electrolytes.

None exist on the palms of the hands or soles of the feet.

6. The ____________ is considered to be a blood reservoir because it stores a large volume of blood within its veins.

7. Hair color is genetically determined but can be influenced by hormones and chemicals, such as those used in chemotherapy.

	True
	False

8. Sweat has the ability to kill bacteria on the skin's surface.

	True
	False

9. ___________ glands produce protective ear wax within the external acoustic meatus.

Answer 1

1. Lamellar granules release a water-repellant sealant onto the surface of the keratinocytes.

Answer:- True

Explanation:-Keratinocytes make up about 90% of epidermal cecell. It produce keratin protein and lamellar granules. Lamellar granules release a water-repellant sealant onto the surface of the keratinocytes to inhibits the entry and loss water as well as the entry of foreign materials.

2. _______ perspiration is water loss that cannot be seen and occurs through evaporation of water from the interstitial fluid and sweat gland pores.

Answer:- Insensible

Explanation:-Insensible perspiration is perspiration of the interstitial fluid that is lost by evaporation through the layer stratum corneum of epidermis. Generally, it cannot be perceived or sensed. In insensible perspiration, body is constantly releasing fluids through the skin which can not be seen. This can lead to dehydration.

3. Which one of the following is not correct about beta-carotene?

Answer:- It is stored in fatty areas with other water-soluble chemicals.

Explanation:-Beta-carotene is bright yellow-orange in color. It can be converted into vitamin A. It is insoluble in water and soluble in fat. As it is soluble in fat it can not be stored in fatty areas with other water soluble chemicals.

4. Vitamin D3 will cause the intestines to absorb more calcium from food.

Answer:-True

Explanation:-Vitamin D3 is a pro-hormone that requires metabolic activation to generate the most active chemical form. It required for absorption of calcium along with phosphorus which are needed to build strong bones and teeth. Thus it helps in absorption in the intestines absorb calcium from food.

5. Which one of the following is not true about sebaceous glands?

Answer:-The majority secrete their secretion directly to the skin surface.

Explanation:- Sebaceous (oil) glands are simple branched alveolar glands that are connected to the hair follicle and produce sebum. They are found over the entire surface of the body except the palms, soles, and dorsum of the feet. Sebum is a mixture of tryglycerides, cholestorol, proteins, and electrolytes. It inhibits the growth of bacteria, lubricates and protects the keratin of the hair shaft also moisture skin.Sebaceous glands empty their secretory product into the upper parts of the hair follicles.

6. The ____________ is considered to be a blood reservoir because it stores a large volume of blood within its veins.

Answer:- Spleen

Explanation:- Speen produces lymphocytes, plasma cells, and antibodies. stores iron and metabolites. It produces red blood cells (usually in fetus) and white blood cells throughout life. Speen also act as a blood reservoir.

7. Hair color is genetically determined but can be influenced by hormones and chemicals, such as those used in chemotherapy.

Answer:- True

Explanation:- Several different genes are involved in hair color. However chemicals those used in chemotherapy change head hair color or texture. Changing hormone teenagers can also change hair color.

8. Sweat has the ability to kill bacteria on the skin's surface.

Answer:- True

Explanation:-Sweat glands secrete a saline solution called sweat which function in thermoregulation. Sweat contains water, with some salts, vitamin C, antibodies, dermicidin, and traces of metabolic wastes. Dermicidin is a microbe-killing peptide and thus sweat has the ability to kill bacteria on the skin's surface.

9. ___________ glands produce protective ear wax within the external acoustic meatus.

Answer:-Ceruminous (ceruminius) and sebaceous

Explanation:- External Acoustic Meatus is a Canal through temporal bone from auricle to tympanic membrane. Ceruminius and sebaceous glands produce cerumen (ear wax) within the external acoustic meatus.