Unit 3 Flashcards
Contraction of a skeletal muscle occurs when:
(a) calcium inhibits the action potential
(b) potassium rushes into the cell and an action potential is generated
(c) sodium rushes into the cell and an action potential is generated
(d) acetylcholine inhibits the permeability of the sarcolemma
(c) sodium rushes into the cell and an action potential is generated
T/F
Actin filaments shorten as they are pulled by the myosin heads during muscle contraction
FALSE
T/F
Calcium, which is released to facilitate a skeletal muscle contraction, is stored in the sarcolemma
FALSE
T/F
Cardiac muscle is striated and involuntary
TRUE
T/F
Muscle fascicles are covered with the connective tissue wrapping called epimysium
FALSE
T/F
The terms cross bridges and myosin heads refer to the same structure
TRUE
T/F
Skeletal muscle is considered involuntary because it is the only type of muscle usually subject to conscious control
FALSE
T/F
Skeletal muscles need nerve stimulation for contraction to occur
TRUE
T/F
One of the important functions of skeletal muscle is to generate heat
TRUE
Define
Synaptic Cleft
Gap between the sarcolemma and neuromusclar junction
Which connective tissue attaches bone to bone
Ligament
Define
sarcomere
the contractile portion of a myofibril
Define
motor unit
one neuron and all the muscle cells it stimulates
Define
myofibrils
bundles of myofilaments
Which connective tissue attaches muscle to bone
tendon
