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Flashcards covering muscle tissue types, tissue renewal ability, stem cell potency, and stem cell classifications based on lecture notes.
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Skeletal Muscle
A muscle tissue type characterized by the presence of striations, voluntary contraction, many nuclei per cell, long cell appearance, and located in voluntary muscles.
Cardiac Muscle
A muscle tissue type characterized by the presence of striations, involuntary contraction, one nucleus per cell, branched & stumpy cell appearance, and located in the heart.
Smooth Muscle
A muscle tissue type characterized by no striations, involuntary contraction, one nucleus per cell, fusiform (tapered) cell appearance, and located in the GI tract.
Characteristics for Tissue Repair
The two characteristics allowing tissue repair: stem cell population within the tissue and vasculature bringing blood (& nutrients) to the area of damage.
Tissue Renewability Ranking
The ranking of tissue renewability from most to least renewable: Epithelial Tissue (most renewable), Connective Tissue (dependent on vascularization), and Muscle Tissue & Nervous Tissue (equal at least renewable).
Epithelial Tissue Renewability Rationale
Although epithelial tissue is avascular (lacks blood supply), its massive renewability is due to the presence of an active unipotent stem cell population.
Potency
The ability of stem cells to differentiate into specialized cell types; higher potency means the cell can differentiate into more cell types, each with a unique function.
Embryonic Stem Cells
Stem cells present only in the very early stages of the embryo just following fertilization; examples include Totipotent Stem Cells and Pluripotent Stem Cells.
Adult Stem Cells
Stem cells present throughout an individual's lifetime; examples include Multipotent Stem Cells and Unipotent Stem Cells.
Scope of Differentiation (Embryonic vs. Adult Stem Cells)
Embryonic stem cells have a larger scope of differentiation than adult stem cells because they can differentiate into far more cell types.