Integumentary System Flashcards
The integumentary system is composed of the ___, ___, ___, ___ and some __ ___
skin, hair, nails, glands, nerve endings
The skin is an outer layer of cells that covers the body. It protects the body, acting as a physical barrier to ___, ___, ___ and more. It also traps ____ in the body that we need. The skin is also used for environmental ___ input, as it gathers information about the environment by sensing ____, ___ and ___. The skin also allows __ and ___ to be ___.
bacteria, dehydration, chemicals, water, sensory, temperature, pressure, pain, water, salts, excreted
The skin also function for immunity, as specialized cells such as ____ ___, and ___ ____ are part of the immune system.
langerhans cells, t cells
a cell that captures and present pathogens to other immune cells
langerhans cell
The skin also is important for ___ ___ ___. UV radiation activates a skin molecule that is a ____ for it.
vitamin D synthesis, precursor
Skin also functions as a ____, as it helps to regulate body temperatures via __, ___ ____ and ____
thermoregulator, capillaries, sweat glands, hair
Sweat glands regulate body temperature via ___ ___. When sweat is secreted to the skin, it ____. In this process, heat from the body is ____, cooling the body by dissipating heat away. However, sweating also requires ___, and results in a loss of water, salts, and ____ which can lead to ____.
evaporative cooling, evaporates, absorbed, ATP, electrolytes, dehydration
The ____ ____ is caused by tiny muscles in the skin which pulls on ___ ___ to make them stand up. This traps a layer of heat next to the skin, ___ us up. It is more effective in generating warmth in animals with more ____. It also occurs in response to ___ or ___, which in other animals, is used to the make the animal look more intimidating
piloerection reflex, hair follicles, warming, hair, stress, emotion
Blood vessels, or _____ will _____ in response to heat, which causes the body to lose heat. They will ____ in the cold to preserve heat. This is why skin is more pale in the cold, because the vessels are ___ and pulling away from the skin ___
capillaries, dilate, constrict, narrow, surface
The outermost layer of the skin is called the ___. It is ____, meaning is has no blood supply of its own. To get nutrients on blood supply, it relies on the ___. This layer is mostly a ___ layer.
epidermis avascular, dermis, protective
The second layer of the skin is called the ____, and is composed of ___ __ filled with __- and __ ___. The dermis also contains hair follicles, ___, ____ and blood vessels. This layer is highly ____, and is tightly connected to the epidermis via the __ ___
dermis, connective tissue, collagen, elastic fibers, glands, nerves, vascularized, basement membrane
The bottom layer of the skin which is called the ___, and is made of __ ___ ___ and ___ ___. It serves as a layer of __ ___ and ____ by storing fat, and can act as a ___ ___
hypodermis, loose connective tissue, adipose tissue, energy storage, insulation, shock absorber
The first layer of the epidermis is the __ ____. This is a layer of ___ ___, that are filled with ____, a protein that gives them a lot of ____ strength by forming a strong ___. This prevents the skin from ___ easily. This layer is also ____, meaning water cannot enter or leave the skin. Because this is a layer of dead cells, the cells are constantly ___ and replaced
stratum corneum, dead cells, keratin, mechanical, barrier, tearing, hydrophobic, shed
The second layer of the epidermis is the ___ ___. This layer is only found in the ___ of the hands and ___ of the feet, making these areas have thicker skin, The cells here are also ___ and filled with keratin
stratum lucidum, palms, soles, dead
The third year of the epidermis is the ___ ___. This layer is filled with cells called ____, which are starting to produce keratin needed in the cells of the layers above it. These cells are starting to undergo ____ and ___ out.
stratum granulosum, keratinocytes, apoptosis, flattening
The fourth layer of the epidermis is the __ ___, which provides __ and ___. this layer is held together by __ ___ called ____. It is mostly made of keratinocytes, but these cells are ___ and have not started producing keratin
stratum spinosum, strength, flexibility, adhesion proteins, desmosomes, alive
The last layer of the epidermis is the ____ ___/ ____. This is the deepest layer and contains ___ ___, ____ ____, and ____. The stem cells create new ______ to replenish the layers above
stratum basale, germinativum, merkel cells, stem cells, melanocytes, keratinocytes
Keratinocytes produce kertain that helps ___ the skin and allows it form a __ ___ to withstand mechanical stress. As they are pushed up toward the top of the skin, they produce keratin and ___, losing their ___ along the way. This type of cell constitutes most of the epidermis, and the keratin produced is the most abundant ____ in the epidermis.
waterproof, strong barrier, die, organelles, protein
The melanocytes produce _____, which is a pigment molecule that alters the __- of the skin and can protect it against ___ light.
melanin, colour. UV
The langerhans cells are ___ cells mostly found in the ____ layers of epidermis. They can detect pathogens and stimulate an immune response by gathering ____ from pathogens, and presenting them to __ ___ for further immune defence.
immune, deeper, antigens, t cells
Merkel cells are attached with ___ ____ to function as ____
sensory neurons, mechanoreceptors
The dermis allows the skin to be sturdy but ___, and gives a lot of _____ ___ ___ to the skin, due to it being thicker than the epidermis. It contains structures that allow the skin to act as more than just a protective barrier. For example, hair follicles allow for ____. ___ ____ conduct sensory information to the rest of the body, and blood vessels provide ___ and ____, as well as ____.
flexible, underlying structural support, thermoregulation, nerve endings, oxygen, nutrients, thermoregulation
Collagen is the most ____ protein is the dermis and the entire body. It is a __ __ that is present in tissue as a ___ ___, which provides its strength. It is a repeating pattern of ___ ___, every 3rd of which is ____.
abundant, fibrous protein, triple helix, amino acids, glycine
Mechanoreceptors called ___ __, detect light touch. These are found mostly in the ___, and are abundant in the ____ and ____. They are also called _____ corpuscles.
tactile corpuscles, dermis, fingertips, lips, meissner
