5 Written questions
5 Matching questions
- Which of the following is the correct sequence of events for muscle contractions?
A) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
B) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
C) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
- When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
- The oxygen-binding protein found in muscle cells is ________.
- The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?
A) Binding causes chemically gated potassium channels to open in the motor end plate.
B) Binding causes voltage-gated sodium channels to open in the motor end plate.
C) Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate.
D) Binding causes potassium voltage-gated channels to open in the motor end plate.
- Which event is most significant in initiating the "wave of depolarization"?
A) diffusion of acetylcholine into the muscle fiber
B) diffusion of acetylcholine down the length of the muscle fiber
C) diffusion of K+ out of the muscle fiber
D) diffusion of Na+ into the muscle fiber
- a C
- b D) diffusion of Na+ into the muscle fiber
- c myoglobin
- d refractory period
- e B
5 Multiple choice questions
- Chemically gated ion channels
- anaerobic pathway
5 True/False questions
Skeletal muscle cells have one nucleus, but smooth muscle cells are multinucleated? → True
The distance between Z discs ________ during muscle contraction.
C) decreases and then increases
D) stays the same → D
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
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 → stretching of the muscle
A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are these components connected?
A) potassium leak channels
B) myosin cross-bridge binding sites
C) a series of proteins that control calcium release
D) voltage-gated sodium channels → C) a series of proteins that control calcium release