Exercise 7: The Integumentary System Flashcards
The skin is also called the?
Cutis/Integument
The skin constitutes _______ to ________ of total body weight.
15% to 20%
The skin cover an area of about _______ or __________.
2 square meters or 22 square feet
What are the 3 main layers of the skin?
Epidermis
Dermis
Hypodermis
Epidermis is composed of what type of epithelium?
Keratinized Stratified Squamous Epithelium
Keratinized Stratified Squamous Epithelium will continually grow, but they can maintain their thickness through the process of?
Desquamation
Define Desquamation.
It is a natural process in which new skin cells are created as they continually slough off/ shed.
Epithelium will arise from the _____________.
Ectoderm
Dermis is composed of
Dense Irregular Connective Tissue
Dermis will arise from?
Mesoderm
It lies directly under the dermis.
Hypodermis
The hypodermis is composed of ___________________ and ___________________
Areolar and Adipose Connective Tissue
Individuals who are well-nourished have relatively thicker __________________.
Hypodermis
Skin is categorized in 2. What are those categorization?
Thin skin and Thick skin
Thin skin is located in all parts of the body except ____________, ______________, and ________
Palms
Palmar Surface
Sole
What are the 4 strata layers of the thin skin?
Stratum Basale
Stratum Spinosum
Stratum Granulosum
Stratum Corneum
What type of skin is located in the palms, palmar surface, and the sole.
Thick Skin
How thick is the thin skin?
0.10 - 0.15 nm
How thick is the thick skin?
0.6 - 0.45 nm
Stratum Basale is also known as?
Stratum Germinativum
Stratum Basale contains cells that continuously dividing as they have _______________.
Keratinocytes
How many layers of cuboidal cells does stratum Basale has?
1 layer of cuboidal cells
Keratinocytes contains
Large nucleus
Mitochondria
Golgi complex
Cytoskeleton
Rough Endoplasmic Reticulum
Stratum Spinosum is also known as?
Prickle Cell Layer
How many layers of keratinocytes are in the stratum spinosum?
8-10 layers
Describe the keratinocytes in stratum Spinosum.
They have the same organelles as the stratum Basale but only few cells retain its ability to divide.
.Stratum spinosum contains what kind of cell?
Intraepidermal macrophage cell/ Langerhans cell
Stratum granulosum contains how many layers of flattened dead cell?
3-5 layers
Keratinocytes in stratum granulosum undergoes ____________.
apoptosis
It marks the transition of the superficial dead layer of skin to the metabolically active cells.
Stratum Granulosum
Stratum granulosum has no keratin intermediate filaments but has ______________.
Keratohyalin
Stratum Lucidum is only located in __________________.
Thick skin
Stratum Lucidum has how many layers of dead keratinocytes?
3-5 layers
Stratum Lucidum has high amount of _____________.
Keratin
What are the 2 layers of the Dermis?
Papillary layer and Reticular layer
What layer of the dermis is most superficial?
Papillary Layer
