5 Written questions
5 Matching questions
- Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. What specific event initiates the contraction.
A) Sodium release from the sarcoplasmic reticulum initiates the contraction
B) voltage-gated proteins change shape.
C) calcium release from the sarcoplasmic reticulum initiates the contraction
D) Action potentials propagate into the interior of the skeletal muscle fiber.
- A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate.
- The end of the muscle that typically moves when a muscle contracts is called the ________.
- Which of the following is not a component of the standard treatment for muscle strain?
rest of the muscle
elevation of the limb
stretching of the muscle
ice on the muscle
- Muscle tone is ________.
- a C
- b a state of sustained partial contraction
- c stretching of the muscle
- d False
- e insertion
5 Multiple choice questions
- D) skeletal muscle: voluntary control
- C) a series of proteins that control calcium release
5 True/False questions
The giant protein titin maintains the organization of the ________ assisting in muscle stretching. → sarcolemma
The major role of the sarcoplasmic reticulum is to regulate ________.
A) intracellular levels of Na+
B) intracellular levels of Ca2+
C) extracellular levels of Ca2+
D) extracellular levels of Na+ → B) intracellular levels of Ca2+
The sliding filament model of contraction involves ________.
A) the Z discs sliding over the myofilaments
B) the shortening of thick filaments so that thin filaments slide past
C) actin and myosin sliding past each other and partially overlapping
D) actin and myosin lengthening in order to slide past each other → B
Skeletal muscle cells are multinucleated → True
The first step toward generating a skeletal muscle contraction is ________.
A) binding of the myosin heads to actin
B) a rise in intracellular Ca2+ levels
C) binding of ATP to the myosin heads
D) stimulation of the muscle by a nerve ending → True