Integumentary

Integumentary System
Integument: ___________________
Dermat: ____________ ology: ___________________
A. The skin is the largest organ of the body, covering

_________ m2 in adults and accounting for ___% of body
weight.
1. The skin is composed of two layers:
a. The stratified squamous layer called the

____________________.
b. The connective tissue layer called the

______________.
i. Beneath the dermis is another

connective tissue layer called the ________________ or
_________________________ layer.
2. Most of the skin is _____ mm thick, but it ranges from __________ mm thick.
B. Functions of the skin
1. Resistance to ________________ and ____________________.
a. Epidermal cells contain the protein keratin (kerat: ____________). _____________ is

the protein in animal horns and forms the outer layer of our skin.
2. Barrier to _______________, UV radiation, and chemicals.
a. The skin can be permeable to some chemicals and drugs (nicotine patch,
nitroglycerine patch, etc.)
3. __________________ synthesis
a. The first step in vitamin D synthesis, which is needed for ________________ and
maintenance, occurs in the skin.
4. ___________________
a. Nerve endings in the skin sense temperature, pressure, touch, vibration, and pain
depending on number and location of receptors.
5. ____________________
a. Vasoconstriction and vasodilation of cutaneous blood vessels and sweat glands

help maintain ________________________________.
C. __________________________ is a keratinized ___________________________ layer that lacks blood

vessels and has few nerve endings.
1. There are 5 types of cells in the epidermis

a. ________________ cells are _____________________________ cells that divide to form
keratinocytes and are only in the stratum basale.
b. _________________________ are the most ________________ cell in the epidermis and

synthesize ___________________.
c. _____________________ are located in the stratum basale and synthesize the

pigment _________________ which is secreted out of the cells and absorbed
by keratinocytes.
d. _____________ cells are _____________________ for touch found in the stratum basale.
e. _________________________ cells are located in the stratum spinosum and stratum

granulosum and are ________________________ that protect the surrounding cells from
toxins and other pathogens.
D. Layers of the epidermis
1. Stratum ________________is a _____________ layer of cuboidal to low columnar stem cells

and keratinocytes on the basement membrane.
2. Stratum __________________ is composed of several layers of keratinocytes, and is usually

the ______________ section except in thick skin.
3. Stratum ________________________ has _________ layers of flat keratinocytes containing

granules of keratin. This is the location of _______________________ of the keratinocytes.
4. Stratum _________________ is a translucent zone only in _______________ skin containing

cells that lack nuclei and other organelles.
5. The stratum _______________ consists of up to _________ layers of dead keratinized cells.
E. The ______________ is a connective tissue layer

ranging in thickness between ______________ mm thick.
1. The main component of the dermis is

___________________.
a. Other components include _____________ and

reticular fibers, _________________, and other
cells found in fibrous connective
tissue.
b. The dermis contains blood vessels, nerve

endings, sweat glands, sebaceous glands, hair
follicles, and piloerector muscles.
2. The dermis is split into two layers:

a. The _________________ layer is a thin area of ______________ tissue that allows
movement of leukocytes between layers, and is highly vascularized.
b. The ___________________ layer is deeper and thicker than the papillary layer.
i. This layer contains thicker bundles of __________________ fibers and groups

of __________________.
F. The ____________________________ can often be indistinguishable from the dermis with continued
amounts of __________________ and ____________________ tissue.
1. _________________________ fat is adipose tissue contained within the hypodermis.
Review Questions
1. Define integumentary and dermatology.
2. What is the body’s largest organ?
3. What are the two layers of the skin?
4. What are the 5 functions of the skin?
5. Why is Vitamin D synthesis important for the body?
6. How does the skin help regulate body temperature?
7. What are the 5 types of cells in the epidermis?
8. What is keratin, and what cells produce it?
9. What is melanin, what cells produce it, and what cells absorb it?
10. What are the names of macrophages found in the epidermis?
11. What is the most abundant cell type in the epidermis?
12. What are the layers of thick and thin skin skin?
13. What layer is present in the thick skin that is not present in the thin skin?
14. What layer is the site of cell death?
15. What is the tissue type of the dermis?
16. What is the primary component of the dermis?
17. What are the two layers of the dermis, and how are they different?
18. What is the hypodermis, what is its function?

Membranes & Glands
A. A ___________is a cell or organ that ____________________ substances for use elsewhere in the
body or releases them for elimination from the body and are composed of _____________________
cells.
1. Glands can be classified as exocrine or endocrine.
a. exo: ________; endo: ___________; crine: ______________________
b. ________________ glands secrete substances onto a ________________________ using

a duct, which is an epithelial tube.
c. ________________ glands are ___________________ glands and do not contact a free

surface. Endocrine glands secrete ______________________ which function as
chemical messengers.
2. Exocrine glands are enclosed in a fibrous ________________ that separate the gland into
_____________.
a. Exocrine glands are classified as ____________ for a single duct or

___________________ for branched ducts.
b. Exocrine glands can be classified by ____________ of their secretory portion with

____________ glands having ____________________________, and _____________ glands
forming a ____________________________.
3. Secretions from exocrine glands
a. ________________ glands produce ____________, _______________ fluids such as sweat,

milk, tears and digestive juices.
b. __________________ glands secrete the glycoprotein ____________ which absorbs water to form
________________, _________________ mucus.
4. Methods of secretion
a. ________________ or eccrine glands release their

secretions through ______________ released
by_______________________.
b. ___________________ glands accumulate a product and then the cell

__________________ to release the product, which creates a thicker byproduct
due to the _____________________________.
B. Membranes
1. The largest membrane of the body is the _____________________membrane consisting of a

stratified squamous epithelium and a connective tissue layer, and it is relatively ___________
compared to other membranes.
2. There are two types of internal membranes:
a. ___________________ membranes or _____________________ line passageways that

open to the _____________________ environment namely the cells lining the digestive,
respiratory, urinary and reproductive tracts.
i. A mucosa has _____________ layers consisting of an _________________, an

____________ connective tissue layer called the _________________________, and
sometimes a __________________________ layer called the
_________________________ mucosa.
aa. The function of these membranes is _________________,

_______________ and ____________________________.
b. ____________ membranes or _______________ are _______________________ epithelium

that sit on a thin ______________________ connective tissue layer and produce
watery ______________ fluid.
i. Serous fluid is named because it is derived from the _____________and is

similar to ____________________________.
ii. Serous membranes line the _______________ of some body ______________

and form a smooth ________________ surface on some of the viscera.
c. ______________________ membranes are made only of _______________________ and

line some of the ____________________ in the skeletal system bridging the gap from
one ____________to another secreting synovial fluid into the joint.
Review Questions
1. Define gland and exocrine and endocrine.
2. Contrast a simple and a compound gland and a tubular and acinar gland.
3. Contrast the merocrine and holocrine methods of secretion.
4. What is the body’s largest membrane?
5. What are the two types of internal membranes?
6. What are the differences between a mucous and a serous membrane?
7. What are the layers of a mucous membrane, and which of the four tissue types compose each
layer?
8. What is the name of the membranes that surround joints?

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Integumentary System

Dermat: ____________ ology: ___________________

A. The skin is the largest organ of the body, covering

1. The skin is composed of two layers:

a. The stratified squamous layer called the

b. The connective tissue layer called the

i. Beneath the dermis is another

B. Functions of the skin

1. Resistance to ________________ and ____________________.

a. Epidermal cells contain the protein keratin (kerat: ____________). _____________ is

2. Barrier to _______________, UV radiation, and chemicals.

a. Vasoconstriction and vasodilation of cutaneous blood vessels and sweat glands

C. __________________________ is a keratinized ___________________________ layer that lacks blood

1. There are 5 types of cells in the epidermis

b. _________________________ are the most ________________ cell in the epidermis and

c. _____________________ are located in the stratum basale and synthesize the

e. _________________________ cells are located in the stratum spinosum and stratum

D. Layers of the epidermis

1. Stratum ________________is a _____________ layer of cuboidal to low columnar stem cells

2. Stratum __________________ is composed of several layers of keratinocytes, and is usually

3. Stratum ________________________ has _________ layers of flat keratinocytes containing

4. Stratum _________________ is a translucent zone only in _______________ skin containing

5. The stratum _______________ consists of up to _________ layers of dead keratinized cells.

E. The ______________ is a connective tissue layer

1. The main component of the dermis is

a. Other components include _____________ and

b. The dermis contains blood vessels, nerve

2. The dermis is split into two layers:

i. This layer contains thicker bundles of __________________ fibers and groups

1. _________________________ fat is adipose tissue contained within the hypodermis.

1. Define integumentary and dermatology.

2. What is the body’s largest organ?

3. What are the two layers of the skin?

4. What are the 5 functions of the skin?

5. Why is Vitamin D synthesis important for the body?

6. How does the skin help regulate body temperature?

7. What are the 5 types of cells in the epidermis?

8. What is keratin, and what cells produce it?

10. What are the names of macrophages found in the epidermis?

11. What is the most abundant cell type in the epidermis?

14. What layer is the site of cell death?

15. What is the tissue type of the dermis?

16. What is the primary component of the dermis?

18. What is the hypodermis, what is its function?

1. Glands can be classified as exocrine or endocrine.

a. exo: ________; endo: ___________; crine: ______________________

b. ________________ glands secrete substances onto a ________________________ using

c. ________________ glands are ___________________ glands and do not contact a free

a. Exocrine glands are classified as ____________ for a single duct or

b. Exocrine glands can be classified by ____________ of their secretory portion with

3. Secretions from exocrine glands

a. ________________ glands produce ____________, _______________ fluids such as sweat,

a. ________________ or eccrine glands release their

b. ___________________ glands accumulate a product and then the cell

1. The largest membrane of the body is the _____________________membrane consisting of a

a. ___________________ membranes or _____________________ line passageways that

i. A mucosa has _____________ layers consisting of an _________________, an

aa. The function of these membranes is _________________,

b. ____________ membranes or _______________ are _______________________ epithelium

Dermat: ology: _______

1. Resistance to and ____.

a. Epidermal cells contain the protein keratin (kerat: ). _ is

C. is a keratinized _ layer that lacks blood

b. _________ are the most cell in the epidermis and

1. Stratum ____is a _ layer of cuboidal to low columnar stem cells

3. Stratum ________________ has _ layers of flat keratinocytes containing

4. Stratum ___ is a translucent zone only in _ skin containing

5. The stratum _______ consists of up to _ layers of dead keratinized cells.

a. exo: __; endo: _; crine: __________________

b. glands secrete substances onto a ________ using

c. glands are ___ glands and do not contact a free

a. __ glands produce , _ fluids such as sweat,

a. _ membranes or ___ line passageways that

i. A mucosa has _ layers consisting of an _____, an

b. ____ membranes or _ are _________________ epithelium

ii. Serous membranes line the _ of some body

c. membranes are made only of _ and