CHAPTER 4 SKIN AND BODY
MEMBRANES TEST EXAM QUESTIONS
AND ANSWERS GRADED A+ 2025/2026
Cutaneous Membrane
Dry epithelial membrane; keratinized stratified squamous epithelium (epidermis) + dense
connective tissue (dermis); forms the outer covering of the body.
Mucous Membrane (Mucosa)
Moist membrane lining cavities open to the exterior (digestive, respiratory, urinary,
reproductive); functions in secretion, absorption, and protection; composed of epithelium +
lamina propria.
Serous Membrane (Serosa)
Membrane lining closed ventral body cavities; has parietal and visceral layers with serous fluid
between them to reduce friction; examples include pleura, pericardium, and peritoneum.
Parietal Layer
The outer layer of a serous membrane that lines the cavity wall.
Visceral Layer
Inner layer of a serous membrane that directly covers an organ.
Serous Fluid
Fluid produced by serous membranes that reduces friction between organs.
Synovial Membrane
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Connective tissue membrane (no epithelium) lining joints, bursae, and tendon sheaths;
produces lubricating synovial fluid.
Integumentary System Components
Includes skin, sweat glands, oil glands, hair, and nails.
Mechanical Protection of Skin
Provided by keratin, fat deposits, and physical barrier of epidermis and dermis.
Chemical Protection of Skin
Keratin barrier and pain receptors help detect harmful chemicals.
Bacterial Protection of Skin
Acid mantle inhibits microbes; dermal phagocytes destroy bacteria.
UV Protection of Skin
Melanin produced by melanocytes absorbs UV radiation.
Thermal Protection of Skin
Temperature receptors detect heat/cold; blood flow adjustments help regulate heat.
Desiccation Prevention
Keratin and glycolipids prevent water loss.
Skin's Role in Body Temperature Regulation
Involves sweating and vasodilation/vasoconstriction of dermal blood vessels.
Vitamin D Synthesis
UV light triggers skin to convert cholesterol into vitamin D precursor.
Epidermis
Avascular outer layer of skin made of stratified squamous epithelium.
Stratum Basale
Deepest epidermal layer; site of active mitosis; contains melanocytes.
Stratum Spinosum
Thick, spiny layer where early keratin production begins.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
MEMBRANES TEST EXAM QUESTIONS
AND ANSWERS GRADED A+ 2025/2026
Cutaneous Membrane
Dry epithelial membrane; keratinized stratified squamous epithelium (epidermis) + dense
connective tissue (dermis); forms the outer covering of the body.
Mucous Membrane (Mucosa)
Moist membrane lining cavities open to the exterior (digestive, respiratory, urinary,
reproductive); functions in secretion, absorption, and protection; composed of epithelium +
lamina propria.
Serous Membrane (Serosa)
Membrane lining closed ventral body cavities; has parietal and visceral layers with serous fluid
between them to reduce friction; examples include pleura, pericardium, and peritoneum.
Parietal Layer
The outer layer of a serous membrane that lines the cavity wall.
Visceral Layer
Inner layer of a serous membrane that directly covers an organ.
Serous Fluid
Fluid produced by serous membranes that reduces friction between organs.
Synovial Membrane
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Connective tissue membrane (no epithelium) lining joints, bursae, and tendon sheaths;
produces lubricating synovial fluid.
Integumentary System Components
Includes skin, sweat glands, oil glands, hair, and nails.
Mechanical Protection of Skin
Provided by keratin, fat deposits, and physical barrier of epidermis and dermis.
Chemical Protection of Skin
Keratin barrier and pain receptors help detect harmful chemicals.
Bacterial Protection of Skin
Acid mantle inhibits microbes; dermal phagocytes destroy bacteria.
UV Protection of Skin
Melanin produced by melanocytes absorbs UV radiation.
Thermal Protection of Skin
Temperature receptors detect heat/cold; blood flow adjustments help regulate heat.
Desiccation Prevention
Keratin and glycolipids prevent water loss.
Skin's Role in Body Temperature Regulation
Involves sweating and vasodilation/vasoconstriction of dermal blood vessels.
Vitamin D Synthesis
UV light triggers skin to convert cholesterol into vitamin D precursor.
Epidermis
Avascular outer layer of skin made of stratified squamous epithelium.
Stratum Basale
Deepest epidermal layer; site of active mitosis; contains melanocytes.
Stratum Spinosum
Thick, spiny layer where early keratin production begins.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
