5 Written questions
5 Matching questions
- 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
- Muscle tissue has all of the following properties except ________.
- The sliding filament model of contraction states that ________.
A) during contraction the thin myofilaments slide past the thick myofilaments so that calcium ions can be released from the sarcoplasmic reticulum
B) during contraction the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater degree
C) during contraction the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments no longer overlap
D) during contraction the thin myofilaments slide past T tubules so that the Z discs are overlapping
- Duchenne muscular dystrophy could theoretically be cured if a technique was developed that would _________.
A) strengthen the dystrophin proteins that are present in the patient's muscle fibers
B) double the existing number of dystrophin molecules in the patient's muscle fibers
C) strengthen the thick and thin filaments in the patient's muscle fibers
D) none of the above
- The distance between Z discs ________ during muscle contraction.
C) decreases and then increases
D) stays the same
- a B
- b D) diffusion of Na+ into the muscle fiber
- c A) decreases
- d secretion
- e D) none of the above
5 Multiple choice questions
- D) excitability
- C) running a marathon
5 True/False questions
The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment. → sarcomere
A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate. → False
Cardiac muscle has a limited regenerative capacity. → True
Which muscle cells have the greatest ability to regenerate? → smooth
How is acetylcholine (ACh) removed from the synaptic cleft?
A) acetylcholinesterase (AChE; an enzyme)
B) diffusion away from the synaptic cleft
C) a reuptake pump on the axon terminal → B