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T OR F: skin surface markings that reflect points of tight dermal attachment to underlying tissues are called epidermal ridges
T OR F: because body hair seems to serve no important function, there are no nerve endings associated with it and therefor no sensation from any stimulation is felt
T OR F: the dense fibrous connective tissue portion of the skin is located in the reticular region of the dermis
T OR F: keratinocytes produce melanin, the polymer responsible for protecting the skin from damaging UV light
T OR F: the pinkish hue of individuals with fair skin is the result of the crimson color of oxygenated hemoglobin (contained in red blood cells) circulating in the dermal capillaries and reflecting through the epidermis
T OR F: during the resting phase of hair growth, the matrix is inactive and the follicle atrophies
T OR F: hair growth and density are influenced by hormones, nutrition, and, in some cases, lifestyle
T OR F: the protein found in large amounts in the outermost layer of epidermal cells is collagen
T OR F: joe just burned himself on a hot pot. a blister forms and the burn is painful. joe's burn would best be described as a third-degree burn
T OR F: destruction of the matrix of the hair bulb would result in its inability to produce oil
T OR F: the skin is not able to receive stimuli because the cells of the epidermis are not living and therefore there are no sensory receptors in the skin
T OR F: because the process of sweating is regulated by the sympathetic division of the autonomic nervous system, humans have little control over the mechanism of sweating
T OR F: sudoriferous (sweat) glands are scattered over the entire body, and the product of these glands contributes to temperature control in humans
T OR F: the nail is actually a modification of the skin and corresponds to the hooves of animals
T OR F: the reason that the nail bed appears pink is the presence of a large number of melanocytes in the underlying dermis
T OR F: a physician is often able to detect homeostatic imbalances in the body by observing changes in the skin color.
T OR F: the dermis is highly vascularized, accounting for the often pink color in the cheeks of babies
T OR F: the dermis has a connective tissue and adipose layer that loosely binds the body together
T OR F: merkel cells are associated with a disclike sensory nerve ending, and together they are called "merkel discs," which function as pain sensory receptors
T OR F: when an individual is exposed to extremely low air temperatures, the vasculature of the skin will dilate so that blood and heat will be dissipated
T OR F: langerhans' (star-shaped cells) arise from the dermis and work together with melanocytes to protect the skin from UV rays
T OR F: the stratum corneum (outermost layer of skin) is a zone of approximately four layers of viable cells that are able to synthesize proteins that keep the outer layer of skin smooth and soft
T OR F: because the dermis is deeper than the epidermis, it is rarely subject to damage because the cornified layers of the epidermis to protect it
the protein found in the epidermis that is responsible for waterproofing and toughening the skin
a needle would pierce the epidermal layers of the forearm in which order?
corenum, granulosum, spinosum, basale
which statement correctly explains why hair appears the way it does
kinky hair has flat, ribbonlike hair shafts
if a splinter penetrated the skin in to the third epidermal layer of the sole of the foot, which cells would be damaged
which of the following cutaneous receptors is specialized for the reception of touch or light pressure
although the integument is a covering, it is by no means simple, and some of its functions include
resident macrophage-like cells whose function is to attack bacterial invaders and present them to the immune system
sudoriferous glands vary in distribution over the surface of the body. which of the following is correct
ceruminous glands secrete cerumen, which is thought to repel insects
nutrients reach the surface of the skin (epidermis) through the process of
diffusing through the tissue fluid from blood vessels in the dermis
the epidermis is responsible for protecting the body because it has
five distinct layers, each cell shape with a special function
the reason the hypodermis acts as a shock absorber is that:
the major part of its makeup is adipose, which serves as an effective shock absorber
keratinocytes are the most important of the epidermal cells because:
they produce a fibrous protein that fives the skin its protective properties
the epidermis consists of five layers of cells, each layer with a distinct role to play in the health, well-being, and functioning of the skin. which of the following layers is responsible for cell division and replacement
water loss through the epidermis could cause a serious threat to health and well-being. which of the following protects us against excessive water loss through the skin
lamellated granules of the cells of the stratum granulosum, a glycolipid that is secreted into extracellular spaces
melanocytes and keratinocytes work together in protecting the skin from UV damage because the role of the keratinocytes is to:
accumulate the melanin granules on their superficial portion, forming a pigment that protects DNA from UV radiation
which of the following cell types are likely to be found in the dermis
fibroblasts, macrophages, and mast cells
the design of a person's epidermal ridges is determined by the manner in which the papillae rest upon the dermal ridges to produce the specific pattern known as handprints, footprints, and fingerprints, which of the following satements is true regarding these prints or ridges?
they are genetically determined, therefore unique to each person
the papillary layer of the dermis is connective tissue heavily invested with blood cells. the superior surface has structures called
the dermis has two major layers; which of the following constitutes 80% of the dermis and is responsible for the tension lines in the skin?
the reticular layer
the integumentary system is protected by our immune system through the action of cells that arise from bone marrow and migrate to the epidermis. which of the following cells serve this immune function
macrophages called langerhans' cells
which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage
prolonged exposure to the sun causes increased production of melanin, which in turn acts as a natural sunscreen
sudoriferous (sweat) glands are categorized as two distinct types. which of the following are the two types of sweat glands?
eccrine and apocrine
changes in the color of skin are often an indication of a homeostatic imbalance. which of the following changes would suggest that a patient is suffering from Addison's disease?
the skin takes on a bronze or metallic appearance
apocrine glands, which begin to function at puberty under hormonal influence, seem not to be useful in temperature regulation. where would we find these glands in the human body
in the axillary and anogenital area
the composition of the secretions of the eccrine gland is
99% water, sodium chloride, and trace amounts of wastes, lactic acid, and vitamin c
in addition to protection (physical and chemical barrier), the skin serves other functions. which of the following is another vital function of the skin
it converts modified epidermal cholesterol to a vitamin D precursor necessary in calcium metabolism
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