Test 2
Skin color is the result of the...
Quality of melanin in the skin
Intervertebral discs exhibit a great deal of strength because of the presence of thick bundles of...
collagen
Stratified epithelium consists of...
multiple layers of cells
The epidermal layer found only in thick skin is...
stratum lucidum
In which layer of the epidermis are lamellar bodies formed inside keratinocytes?
stratum spinosum
With aging, individuals tend to feel colder and usually need the thermostat in their home set higher in the winter to feel warm enough. What might explain this?
thinning of the subcutaneous layer
What is the permeability barrier that joins the plasma membranes of adjacent cells to form a tight seal?
tight junction
Epithelial tissue is characterized by...
tightly packed cells
Channel proteins...
provide a tunnel through which ions or molecules can enter or leave the cell.
A general characteristic of connective tissue is that it...
Consists of cells with much extracellular material (matrix) between them.
What attaches epithelial cells to the basement membrane?
Hemidesmosomes
Which of the following conditions may cause low active Vitamin D levels?
Liver dysfunction has reduced the conversion of cholecalciferol to the intermediate for calcitriol production.
A skin cell in the stratum granulosum has experienced a mutation that altered its ability to produce keratin. Should this be a health concern for the individual?
No, because cells of the stratum granulosum are dying cells that do not reproduce, so the mutation will be isolated to the one cell.
Which of the following functions is associated with the skin?
Protection against ultraviolet radiation of the sun
Which of the following is NOT true of G-protein complex action?
Stimulates a cell by means of extracellular chemical signals
In which layer of the epidermis are granules of keratohyalin formed?
Stratum granulosum
Which type of cell contains large amounts of lipids?
adipocytes
Melanin production can be influenced by...
all these choices are correct - hormones - genetics - exposure to sunlight - pregnancy
Body odor results from secretions from the ________ sweat glands.
apocrine
Which type of cell forms cartilage?
chondroblast
A gland with branching ducts that end in acini would be classified as...
compound acinar
The nucleus of a cell functions to...
control and coordinate cellular activities
What is a disc-shaped structure with especially adhesive glycoproteins around each cell that bind cells to one another?
desmosomes
Which type of tissue forms linings or coverings?
epithelial tissue
A slight sunburn is an example of a _________ burn.
first-degree
Melanoma can be detected early and treated with the application of a special rule. Which of the following is NOT a test used to determine if a mole is cancerous?
freckles
Adipose tissue...
functions as an insulator and a site of energy storage.
An intercalated disc is an example location of...
gap junctions
Unlike an exocrine gland, an endocrine gland...
has no ducts
How does intact skin provide protection?
it forms a physical barrier against the entry of microbes
Which of the following is NOT consistent with active transport?
movement is with a concentration gradient
Cells that maintain bone are called...
osteocytes
The dermal layer closest to the epidermis is the...
papillary layer
Keratinization
produces a layer of cells that resist abrasion
The plasma membrane
regulates movement of materials into and out of the cell
Active transport...
requires ATP
Which of the following is a function of epithelial tissue?
secretion and absorption of molecules
Glands whose ducts have no branches are called...
simple
The epidermis of the skin is composed of...
stratified squamous epithelium
This stratum contains many layers of dead squamous cells...
stratum corneum
