PHYS 261 - Ch 12-15 Lecture Quiz
questions well answered graded A+
Skeletal muscles - correct answer ✔✔ muscles attached to bone that cause body movements
Skeletal - correct answer ✔✔ striated, voluntary, controlled by somatic motor neurons
Cardiac muscle - correct answer ✔✔ muscle of the heart
Cardiac - correct answer ✔✔ striated, involuntary; responds to autonomic innervation,
spontaneous contraction and modulated by endocrine system
Smooth muscle - correct answer ✔✔ Involuntary muscle found inside many internal organs of
the body
Transverse tubules - correct answer ✔✔ extension of sarcolemma; allows action potential to
move rapidly into interior of fiber
Calcium from the sarcoplasmic reticulum - correct answer ✔✔ what T-tubules release
Myosin - correct answer ✔✔ thick filament
Actin - correct answer ✔✔ thin filaments
Sarcomere - correct answer ✔✔ contractile unit of a muscle fiber
, Z discs, I band, A band, H zone, M line - correct answer ✔✔ bands of sarcomere
Z disc - correct answer ✔✔ sheet of proteins that anchors the thin filaments and connects
myofibrils to one another
I band - correct answer ✔✔ thin filaments only
A band - correct answer ✔✔ dark area; includes thin and thick filaments
H zone - correct answer ✔✔ thick filaments only
Sliding filament theory - correct answer ✔✔ the concept that a sarcomere shortens as the thick
and thin filaments slide past one another during contraction
Excitation contraction coupling - correct answer ✔✔ sequence of events from motor neuron
signaling to contraction of the fiber's sarcomeres
Somatic motor neuron releases Ach at neuromuscular junction -> Na+ entry thru Ach receptor-
channel -> initiate A.P. - correct answer ✔✔ Excitation contraction coupling events
Latent period - correct answer ✔✔ - time between stimulus and contraction
- represents the time required for calcium release + binding to troponin
Motor units - correct answer ✔✔ somatic motor neuron + all of the muscle fibers it innervates
Muscle fatigue - correct answer ✔✔ condition when muscle is no longer able to generate or
sustain expected power output
questions well answered graded A+
Skeletal muscles - correct answer ✔✔ muscles attached to bone that cause body movements
Skeletal - correct answer ✔✔ striated, voluntary, controlled by somatic motor neurons
Cardiac muscle - correct answer ✔✔ muscle of the heart
Cardiac - correct answer ✔✔ striated, involuntary; responds to autonomic innervation,
spontaneous contraction and modulated by endocrine system
Smooth muscle - correct answer ✔✔ Involuntary muscle found inside many internal organs of
the body
Transverse tubules - correct answer ✔✔ extension of sarcolemma; allows action potential to
move rapidly into interior of fiber
Calcium from the sarcoplasmic reticulum - correct answer ✔✔ what T-tubules release
Myosin - correct answer ✔✔ thick filament
Actin - correct answer ✔✔ thin filaments
Sarcomere - correct answer ✔✔ contractile unit of a muscle fiber
, Z discs, I band, A band, H zone, M line - correct answer ✔✔ bands of sarcomere
Z disc - correct answer ✔✔ sheet of proteins that anchors the thin filaments and connects
myofibrils to one another
I band - correct answer ✔✔ thin filaments only
A band - correct answer ✔✔ dark area; includes thin and thick filaments
H zone - correct answer ✔✔ thick filaments only
Sliding filament theory - correct answer ✔✔ the concept that a sarcomere shortens as the thick
and thin filaments slide past one another during contraction
Excitation contraction coupling - correct answer ✔✔ sequence of events from motor neuron
signaling to contraction of the fiber's sarcomeres
Somatic motor neuron releases Ach at neuromuscular junction -> Na+ entry thru Ach receptor-
channel -> initiate A.P. - correct answer ✔✔ Excitation contraction coupling events
Latent period - correct answer ✔✔ - time between stimulus and contraction
- represents the time required for calcium release + binding to troponin
Motor units - correct answer ✔✔ somatic motor neuron + all of the muscle fibers it innervates
Muscle fatigue - correct answer ✔✔ condition when muscle is no longer able to generate or
sustain expected power output
