Muscle Physiology Flashcards
What are the 3 types of muscles?
Skeletal, smooth, and cardiac
Striated appearance is due to the presence of ___ and ___ bands.
actin and myosin
Skeletal muscles provide what to the body via sliding filament mechanism?
motor
Is skeletal muscle voluntary or involuntary?
Voluntary
What two things are required for muscle contraction in skeletal muscles?
ATP (energy) and calcium
The neurotransmitter for skeletal muscles is?
Acetylcholine (Ach)
Ach is located at the ends of the _____?
motor neuron (the neuromuscular junction)
Skeletal muscles is part of what type of nervous system?
Somatic nervous system
Smooth muscle is also called?
Visceral muscle
Where is smooth muscle found?
walls of all hollow organs except heart
Smooth muscle contain no ____?
Neuromuscular junctions
How is the transmitter sent in smooth muscle?
interstitial fluid
Muscle relaxation for smooth muscle occurs when?
calcium is moved out of the smooth muscle fibers
Smooth muscle fibers are what type of shape?
spindle shaped with single nucleus
Is smooth muscle voluntary or involuntary?
Involuntary
Cardiac muscle function is to?
pump blood in the circularity system
Cardiac muscle’s cells are what type of shape?
branching and striated
Where is cardiac muscle located?
wall of heart
Is cardiac muscle voluntary or involuntary?
involuntary
When muscles are at rest, the calcium is stored in the _____.
Sarcoplasmic reticulum
What triggers calcium release?
nerve inpulses
The calcium blinds to what on the thin filaments?
troponin
What means the contractile unite of a muscle fiber?
Sarcomere
What mean muscle fiber?
myofibril
What means endoplasmic reticulum that is needed for muscle contraction?
Sarcoplasmic reticulum
What means protein bands where actin filaments attach in a striated muscle fiber and mark the boundary of adjoining contractile units?
Z line
What means thin plasma cell membranes of the muscle cell?
Sarcolemma
