BIOS 251 Exam 3 Chamberlain
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integumentary system - Answer: consists of the skin, hair,
nails, and their associated glands
epidermis - Answer: -outermost layer of skin
-keratinized stratified squamous epithelium
-surface consists of dead cells packed with keratin
-lacks blood vessels and depends on the diffusion of nutrients
from the underlying connective tissue
-sparse nerve ending for touch and pain
dermis - Answer: -middle layer of skin, deeper connective
tissue layer
-consists of mainly collagen, but also has elastic and reticular
fibers, fibroblasts, and other fibrous connective tissues
-well supplied with blood vessels, glands, and nerve endings
-hair follicles and nail roots
Hypodermis - Answer: -loose connective tissue layer of skin
-bottom layer
-subcutaneous tissue
,-areolar and adispose tissue
-pads body and binds skin to underlying tissue
-vascular, drugs inserted here
-has subcutaneous fat for insulation and an energy resovior
thick skin - Answer: covers the palms, soles, and
corresponding surfaces of the fingers and toes. has sweat
glands but no hair follicles or sebaceous (oil) glands
thin skin - Answer: has an epidermis about 0.1 mm thick, with
a thin stratum corneum. possesses hair follicles, sebaceous
glands, and sweat glands.
functions of skin - Answer: resistance to trauma and infection,
other barrier functions, vitamin D synthesis, sensation,
thermoregulation, nonverbal communication
keratinocytes - Answer: -majority of epidermal cells
-synthesizes keratin
-produced deep in the epidermis by the mitosis of stem cells in
the stratum basale
, stem cells - Answer: -cells that divide and give rise to the
keratinocyes
-found in stratum basale
melanocytes - Answer: -occur only in stratum basale
-synthesize the brown to black pigment melanin
tactile cells - Answer: -receptors for touch
-in stratum basale
dentritic cells - Answer: -found in stratum spinosum and
stratum granulosum
-immune cells that originate in the bone marrow but migrate to
the epidermis and epithelia of the oral cavity, esophagus, and
vagina
-stand guard against toxins, microbes, and other pathogens
that penetrate into the skin
-alert immune system to invaders
stratum basale - Answer: -5th and deepest layer of epidermis
-consists of a single layer of cuboidal to low columnar stem cells
University Comprehensive Study
Guide + Exam Questions &
Solutions Graded A+.
Professional Academic Assistance Services
Services Offered
• Proctored Exam Assistance
• Online Class Management (Full Course Support)
• Exam Preparation & Study Materials
• Assignments and Coursework Support
• Essay and Research Paper Writing
• Discussion Posts & Responses
• Editing and Proofreading
• Confidential Academic Consultation
Contact Information
Email:
WhatsApp link: https://wa.me/254704846336
Fast Response | Confidential | Reliable Academic
Support
, Helping Students Achieve Academic Excellence
integumentary system - Answer: consists of the skin, hair,
nails, and their associated glands
epidermis - Answer: -outermost layer of skin
-keratinized stratified squamous epithelium
-surface consists of dead cells packed with keratin
-lacks blood vessels and depends on the diffusion of nutrients
from the underlying connective tissue
-sparse nerve ending for touch and pain
dermis - Answer: -middle layer of skin, deeper connective
tissue layer
-consists of mainly collagen, but also has elastic and reticular
fibers, fibroblasts, and other fibrous connective tissues
-well supplied with blood vessels, glands, and nerve endings
-hair follicles and nail roots
Hypodermis - Answer: -loose connective tissue layer of skin
-bottom layer
-subcutaneous tissue
,-areolar and adispose tissue
-pads body and binds skin to underlying tissue
-vascular, drugs inserted here
-has subcutaneous fat for insulation and an energy resovior
thick skin - Answer: covers the palms, soles, and
corresponding surfaces of the fingers and toes. has sweat
glands but no hair follicles or sebaceous (oil) glands
thin skin - Answer: has an epidermis about 0.1 mm thick, with
a thin stratum corneum. possesses hair follicles, sebaceous
glands, and sweat glands.
functions of skin - Answer: resistance to trauma and infection,
other barrier functions, vitamin D synthesis, sensation,
thermoregulation, nonverbal communication
keratinocytes - Answer: -majority of epidermal cells
-synthesizes keratin
-produced deep in the epidermis by the mitosis of stem cells in
the stratum basale
, stem cells - Answer: -cells that divide and give rise to the
keratinocyes
-found in stratum basale
melanocytes - Answer: -occur only in stratum basale
-synthesize the brown to black pigment melanin
tactile cells - Answer: -receptors for touch
-in stratum basale
dentritic cells - Answer: -found in stratum spinosum and
stratum granulosum
-immune cells that originate in the bone marrow but migrate to
the epidermis and epithelia of the oral cavity, esophagus, and
vagina
-stand guard against toxins, microbes, and other pathogens
that penetrate into the skin
-alert immune system to invaders
stratum basale - Answer: -5th and deepest layer of epidermis
-consists of a single layer of cuboidal to low columnar stem cells
