Integumentary System

Question 1

Name four exocrine glands found in the skin

Answer 1

• subaceous
• sudoriferous - eccrine
• sudoriferous - apocrine
• ceruminous

Question 2

Name the secretion produced by the sebaceous gland.

Answer 2

sebum (oily substance)

Question 3

Name the secretion produced by the ceruminous gland.

Answer 3

cerumen (wax)

Question 4

Where is sebum secreted in the body?

Answer 4

eyelids

Question 5

Where is cerumen secreted in the body?

Answer 5

external auditory canal

Question 6

Name one function of the sebaceous gland.

Answer 6

prevents hair from drying out

Question 7

Name one function of the ceruminous gland.

Answer 7

waterproof canal

Question 8

Define keratinisation.

Answer 8

the replacement of keratinocytes with the protein keratin as they move from one epidermal layer to the next

Question 9

List the four layers in thin skin that are involved in keratinisation.

Answer 9

• stratum basale
• stratum spinosum
• stratum granulosum
• stratum corneum

Question 10

Describe the structure of the keratinocytes - stratum basale.

Answer 10

• single row of cuboidal or columnar keratinocytes
• contains stem cells, melanocytes, merkel’s cells
• attaches to basement membrane

Question 11

Describe the structure of the keratinocytes - stratum spinosum.

Answer 11

• 8-10 layers of thorn-like covered keratinocytes
• course bundles of keratin
• contains melanocytes, langherhans cells

Question 12

Describe the structure of the keratinocytes - stratum granulosum.

Answer 12

• 3-5 layers of flattened keratinocytes (undergoing apoptosis)
• contains lamellar granules
• contains keratohyalin (assembles keratin intermediate filaments into keratin)

Question 13

Describe the structure of the keratinocytes - stratum corneum.

Answer 13

• 25-30 layers of flattened, thin, overlapping, dead keratinocytes
• lack organelles
• cells continuously shed and replaced by cells from deeper strata

Question 14

In which layers does deep healing occur?

Answer 14

• dermis

* subcutaneous

Question 15

List in order, the four phases of deep wound healing.

Answer 15

1. inflammatory phase
2. migratory phase
3. proliferative phase
4. maturation phase

Question 16

Describe one event that occurs in the INFLAMMATORY phase of deep wound healing.

Answer 16

blood clot unites wound edges (epithelial cells migrate across wound)

Question 17

Describe one event that occurs in the MIGRATORY phase of deep wound healing.

Answer 17

formation of scar tissue

Question 18

Describe one event that occurs in the PROLIFERATIVE phase of deep wound healing.

Answer 18

migratory phase events intensify

Question 19

Describe one event that occurs in the MATURATION phase of deep wound healing.

Answer 19

scab sloughs off