What are some chracteristics of cardiac muscle?
have single mononucleated cells, sarcomeres, gap junctions and are not directly innervated.
Are T-tubules more extensive in skeletal muscle or cardiac muscle?
skeletal muscle; they form a diad in cardiac muscle and a triad in skeletal muscle.
What are intercalated discs composed of?
desmosomes, fascia adherens and gap junctions.
What do the macula adherens do?
link intermediate filaments of cardiac muscle cells.
What do fascia adherens do?
anchor actin filament sof sarcomeres.
What do gap junctions do?
allow for the passage of molecules between cardiac cell.s
In the intercalated discs, what makes up the transverse compnenent?
desmosomes and fascia adherens PIC
In the intercalated discs, what makes up the longitudinal component?
gap junctions PIC
What are atrial natriuretic peptides?
Proteins secreted by cardiac muscle that regulate electrolytes, relax smooth muscle and are stimulated by atrial stretching.
cardiac muscle, acute myocardial infarction
What are other names for smooth muscle?
involuntary or visceral muscle.
What are some characteristics of smooth muscle tissue?
single cells, no sarcomeres, innervation from the ANS or enteric system, gap junctions, and their conductance is NOT "all or none".
What are two simialrities between cardic muscle and smooth muscle?
single cells and gap junctions
What are dense bodies?
They are similar to the Z discs found in skeletal muscle. They anchor atctin filaments to each other and do the cell membrane and assist in contraction forces.
What ion are smooth muscle cells dependent upon for contraction?
What are caveolin?
Permanent depressions of the cell membrane that are involved in fluid and electrolyte transport. Calveolin binds to the cholesterol In lipid rafts, which creates vesciles (calveolae)
What two types of receptors are smooth muscles innervated by?
adrenergic (sympathetic) and nicotinic (parasympathetic); excitation is spread by gap junctions.