5 Written Questions
5 Matching Questions
- What is the primary function of wave summation?
increase muscle tension
prevent muscle relaxation
produce smooth, continuous muscle contraction
prevent muscle fatigue
- The smallest contractile unit of a muscle fiber is ________.
A) the elastic filament
B) the myofilament
C) the sarcomere
- 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+
- Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the cytosol. During rigor mortis, this elevation of calcium ion concentration in the cytosol is permanent because ________.
A) mitochondria stop producing ATP molecules required by the sarcoplasmic reticulum's calcium ion pumps
B) troponin molecules bind irreversibly to calcium ions to prevent them from being removed from the cytosol
C) tropomyosin molecules bind irreversibly to calcium ions to prevent them from being removed from the cytosol
D) acetylcholine continues to stimulate the release of calcium ions from the sarcoplasmic reticulum
- When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
- a produce smooth, continuous muscle contraction
- b B) intracellular levels of Ca2+
- c refractory period
- d C) the sarcomere
- e A
5 Multiple Choice Questions
5 True/False Questions
Which of the following is CORRECTLY paired?
A) smooth muscle: striated
B) cardiac muscle: nonstriated
C) cardiac muscle: voluntary control
D) skeletal muscle: voluntary control → D) skeletal muscle: voluntary control
What energizes the power stroke? → direct phosphorylation
The oxygen-binding protein found in muscle cells is ________. → myoglobin
Skeletal muscle cells use creatine phosphate instead of ATP to do work → true
What causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum within a muscle cell?
A) calcium ion pump
D) arrival of an action potential → D) arrival of an action potential