lab 7 Flashcards
what is skeletal muscle?
voluntary muscle that attaches to the skeleton and when they contract cause movement of the skeleton.
composed of long cylinder cells that have multiple nuclei around the edges. has visible striations.
what is smooth muscle?
single nucleus located at the centre of the cell (thickest part).
not voluntary, lines walls of hollow organs in dig tract, pushes food thru tract by contracting and relaxing (peristalsis)
what is cardiac muscle?
striated, single nucleus, and branched.
located linging walls of the heart, has intercalated discs where the cardiac cells join at gap junctions and desmosomes. the contractions of the musc pump blood thru the body, involuntary
what is nervous tissue, where is it found, what is the function?
main component of nerv sys, has CNS and PNS, regulates and controls body functions. contains neurons and neuroglial cells.
found in the brain, spinal chord, and nerves
what is a mucous membrane? what cells make it up?
lines body cavities that open to exterior enviro like hollow organs of dig tract or respiratory tract. secretes mucous and contains goblet cells. made of stratified squamous epithelium or simple columnar epithelium over a thin layer of areolar CT called lamina propria
what is a serous membrane? what cells make it?
lines the walls of cavities and organs within closed ventral body cav.
made of simple squamous epithelium on top of a layer of areolar CT
what is a cutaneous membrane?
the skin that is exposed to the air, dry mem. made of epidermis and dermis.
made of keratinized stratified squamous epithelium
what are the layers on the skin?
superficial region- epidermis
deep region- dermis
what is the mode of secretion for sebaceous glands and sweat glands?
seb- holocrine, secretes oil (sebum) which lubricates skin to protect against friction
sweat- merocrine
explain the role of sweat glands in body temperature regulation
when youre hot you sweat, as the water in the sweat evaporates, the surface of the skin cools bringing you back to equalibrium
what are the 3 fingerprint patterns?
arch- all ridges rise over middle of finger
loop- most common, ridges that turn back on themselves
whorl- series of circles in the centre and broadening out.
what is grey matter? what is white matter?
two areas of nerv tiss in brain.
grey- neuron cell bodies are found within. receive information and regulate outgoing information
white- contains many myelinated sheaths on axons, in your brain it allows the exchange of information and communication between different areas of your brain
what is a neuron?
specialized cells that convert stimuli to electrical signals called action potentials or nerve impulses.
what layers make up epidermis?
stratum basale (deepest, attached to dermis, mitotic)
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum
what layers make up dermis?
papillary layer (superficial, makes finger prints)
reticular layer (80% of thickness)
