Muscle Module 7 Flashcards
Smooth muscle is _______________
not as specialized as skeletal muscle
3 key feature of smooth muscle cells
- there is a SR Membrane in smooth muscle
- No T tubules
- No neuromuscular junction
Why dont we need T tubules in smooth muscle cells
T tubules conduct depolarization in action potential deep in the cell but smooth muscle cells are small
Without neuromuscular junctions what happens to the path of neurotransmitters in cell
neurotransmitters have a larger distance to travel and thus the smooth muscle has a slower response to stimulus
Where does the sarcoplasmic reticulum lay in smooth muscle
no myofibrils so it lays at the membrane
Skeletal muscle from a teleological perspective.
Designed go produce large force rapidly thus
- contractile units are parallel to each other
- neurtransmitter have a short area of diffusion
____________ explains a phenomena in terms of the purpose it serves
teleology
Smooth muscle from a teleologic al perspective although the contraction relies on CA2+ cross bridges too contract;
however, the physiological design is very varied to acomidate for various functions
Smooth muscle filaments
smooth muscle has thin and thick filaments variable in length
________________ is more varied in smooth muscle than skeletal muscle
length and organization of filaments
sarcoplasmic reticulum lays at the membrane because
smooth muscle has no myofibrils
adjacent demosomes allow the cells to
mechanically connect
____________ are specialized structures at the cell membrane that thin filaments attach to. Their function is to allow thin filaments to attach to cell membrane
demosomes
dense bodies connect __________________
adjacent thin filaments.
dense bodies have a composition similar to _________
Z disks
__________ site where two cells are in chemical continuity with one another so small molecules can pass from one smooth muscle cell to another.
Gap junction
Gap junctions allow smooth muscle cells to be in
electrochemical continuity
