Week 5 Muscles 3 Flashcards
(34 cards)
How do you get release of Ca from sarcoplasmic reticulum?
Ryanodine receptors, on gated calcium realase channels
Transverse tubular system or T-system
Tubular invaginations of the plasma membrane that penetrate ALL levels of muscle fibers associated with the sarcoplasmic reticulum
sarcoplasmic reticulum is in close contact with?
Sarcolemma. * this is why the T-tubule system works*
Calcium activated ATPase pumps are where? Do what?
In the membrane of the sER andrestore calcium gradient
Ca realease = muscle _____
contraction
Ca uptake= muscle___
Relaxation, get ready for next contraction
What muscle type is voluntary?
skeletal
What muscle type is NOT striated?
Smooth
What muslce type IS striated?
Skeletal and cardiac
What muscle type is NOT voluntary?
Cardiac and smooth
What is the neuromuscular junction (motor end plate)?
Point at which the myelin sheath ends and the axon comes into contact with the muscle
What does an image of muscles with nerves look like?
a tree
Innervation is required to maintain muscle ____?
Integrity, either use it or lose it
Voltage centers are very close to? Does what?
Ryoidine receptors on the sER to TRIGGER Ca release.
The intimate relation between WHAT allows Ca to be released?
Sarcolemma, sER, and voltage centers on nerves
Cardiac muscle has a larger and better developed what compared to skeletal?
T-tubule system
What are intercalated discs?
They are the cross bands/striations found in cardiac muscle. * special cell to cell contacts linking cardiomycytes together
Main difference between skeletal and cardiac muscle?
1) Cardiac has single center nuclei
2) Cardiac has intercalated discs
3) Cardiac has a larger more developed T-tubule system
Smooth muscle has different contraction initiation
1) mechanical impulse
2) Electrical depolarization
3) Chemical stimuli
Smooth muscle does NOT have what system (but cardiac and skeletal do)?
T-tubule
Afferent vs efferent nerve?
Afferent=sensory; efferent= motor
Somatic vs autonomic nervous system?
Somatic=conscious and voluntary; autonomic= involuntary (smooth muscle, heart, glands)
Neuroglia or glia cells?
Supporting cells near neurons
Schwann cells
Surround the neuron processes and isolate them from adjacent cells and ECM
