10-L1 Skin

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What is one of the functions of the skin?

To produce muscles

To regulate body temperature (correct)

To produce hormones

To produce bones

What type of cells are Langerhans cells?

Dendritic cells (correct)

Muscle cells

Epithelial cells

Fat cells

What is the main function of melanin?

To protect the DNA from UV radiation (correct)

To regulate body temperature

To produce keratin

To synthesize vitamin D

What is the outermost layer of the epidermis?

Stratum corneum (C) Signup and view all the answers

What is the main component of the cells of the stratum corneum?

Keratin (C) Signup and view all the answers

What is the function of keratohyalin granules?

To help seal the deeper layers of the skin (B) Signup and view all the answers

What is synthesized in the skin?

Vitamin D (B) Signup and view all the answers

What is the main function of the stratum granulosum?

To help seal the deeper layers of the skin (B) Signup and view all the answers

What is the shape of the dark cells in the apocrine sweat glands?

Inverted cone (A) Signup and view all the answers

What type of epithelium lines the ducts of apocrine sweat glands?

Stratified cuboidal (A) Signup and view all the answers

Where are apocrine sweat glands largely confined to?

Skin of the axillary and areolae (B) Signup and view all the answers

What is the characteristic of the clear cells in apocrine sweat glands?

They have microinfolds and accumulate glycogen (C) Signup and view all the answers

What is the approximate diameter of the secretory coil of eccrine sweat glands?

500-700 μm (B) Signup and view all the answers

What is the function of the myoepithelial cells in apocrine sweat glands?

To help discharge the glandular secretion (C) Signup and view all the answers

What is the characteristic of the ducts of apocrine sweat glands?

They are similar to the ducts of eccrine glands (B) Signup and view all the answers

What is the primary function of the secretions of eccrine sweat glands?

Cooling the body (A) Signup and view all the answers

How many eccrine sweat glands are present on the average person's skin?

3 million (D) Signup and view all the answers

Where do the ducts of apocrine sweat glands open into?

Hair follicles (A) Signup and view all the answers

What is the composition of the secretion of eccrine sweat glands?

Water and sodium chloride (C) Signup and view all the answers

What is the characteristic of the secretion of apocrine sweat glands?

It is initially odorless but may acquire a distinctive odor (B) Signup and view all the answers

What is the approximate daily production of eccrine sweat glands?

10 L/day (A) Signup and view all the answers

What is the shape of the eccrine sweat glands?

Simple coiled tubular (C) Signup and view all the answers

What is the location of the eccrine sweat glands with the highest density?

Soles of the feet (B) Signup and view all the answers

What is the function of the dark cells in the eccrine sweat glands?

Having bactericidal activity (B) Signup and view all the answers

What is the dermal-epidermal junction also known as?

Cutaneous basement membrane (C) Signup and view all the answers

What is the function of the dermal-epidermal junction in wound reepidermisation?

To serve as a substrate for adhesion and migration of keratinocytes (D) Signup and view all the answers

What is composed of the basal lamina and lamina reticularis?

Basement membrane (A) Signup and view all the answers

What is the role of the dermal-epidermal junction in determining the polarity of basal keratinocytes?

To determine the spatial keratinocyte organisation (C) Signup and view all the answers

What is the function of the dermal-epidermal junction in binding the epidermis to the dermis?

To bind tightly the epidermis to the dermis (A) Signup and view all the answers

What is the lamina lucida and lamina densa part of?

Basal lamina (B) Signup and view all the answers

What is the function of the dermal-epidermal junction in epidermal stratification?

To allow the migration of keratinocytes into the upper layers (D) Signup and view all the answers

What is the main component of the lamina reticularis?

Connective tissue (A) Signup and view all the answers

What is the function of the dermis?

To support the epidermis and bind it to the subcutaneous tissue (D) Signup and view all the answers

What is the thickness of the dermis on the back?

4 mm (C) Signup and view all the answers

What is found between the stratum basale and the dermis?

A basement membrane (D) Signup and view all the answers

What are the two components of the basement membrane?

Basal lamina and reticular lamina (A) Signup and view all the answers

How do nutrients reach keratinocytes?

Through diffusion from the avascular dermis (C) Signup and view all the answers

What is the composition of the papillary layer?

Loose connective tissue (A) Signup and view all the answers

What is the function of the papillary plexus?

To supply blood to the dermal papillae (D) Signup and view all the answers

What is the location of the dermal plexus?

In the dermis and hypodermis (D) Signup and view all the answers

What is the dermal papillary layer composed of?