lecture 3 Flashcards
(24 cards)
in what part of a cell would you find most of a cell’s genetic material
nucleus
what’re the three main parts of a human body cell
plasma membrane, cytoplasm, nucleus
a group of cell’s that have a common function together to perform a specialized group of activities is called?
tissue
what tissue has an extensive matrix, usually has many blood vessels, and provides oxygen and nutrients to overlying tissues
connective tissue
what is the skin also called?
cutaneous membrane
what type of epithelium makes up the epidermis?
keratinized stratified squamous
90% of the cells of the epidermis are of which type?
keratinocytes
which layer consists on average of 25-30 of flattened dead keratinocytes
stratum corneum
pigment-producing cells of the epidermis are located in which layer?
stratum basale
what pigment-producing cell is necessary for the production of vitamin D by the skin
melanocytes
what layer of stem cells that undergo cell division to continually produce new keratinocytes
stratum basale
which epidermal layer marks the transition between metabolically active cells of lower layers and the dead layers of keratinocytes of the upper layers
stratum gransulosum
what skin layer is only present in thick skin
stratum lucidem
what function do langerhan’s cells have and in what skin layer are they present
they’re immune cells that activate other immune cells when the skin is invaded by microbes, in the stratum spinosum
the alternative name for the stratum basale suggests it’s role in forming new cells
germinativum
what can be caused due to a decrease in the amount of oxygen in the blood
cyanosis
as newly formed cells of the stratum basale are pushed to the surface, they accumulate keratin and undergo apoptosis. this process is called?
keratinization
what is the subcutaneous layer also called?
hypodermis
tactile epithelial cells are located in the
stratum basale
what structure found in the skin plays an important role in thermoregulation
sweat glands
the buildup of bilirubin in a infant’s blood can occur if the liver does not remove the chemical, this is called
jaundice
how do nutrients reach the epidermis
diffusing through the tissue fluid from blood vessels in the dermis
vitamin C is important collagen sythesis. which area of the skin would be most affected if there is a deficiency in vitamin C
reticular region of the dermis
in the elderly, blood supply to the dermis is reduced and sweat glands are less active. this combination of factors would most affect…
the ability to thermoregulate
