5 Written questions
5 Matching questions
- 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+
- The force of muscle contraction is controlled by multiple motor unit summation or recruitment.
- What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin is the chemical that activates the myosin heads.
B) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
C) Tropomyosin is the receptor for the motor neuron neurotransmitter.
D)Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
- The muscle cell membrane is called the ________.
- Which of the following is not a connective tissue sheath that wraps individual muscle fibers?
- a D
- b sarcolemma
- c aponeurosis
- d true
- e B) intracellular levels of Ca2+
5 Multiple choice questions
- a state of sustained partial contraction
5 True/False questions
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
Which organelle contains the contractile elements found in skeletal muscle? → sarcomere
Which muscle cells have the greatest ability to regenerate? → smooth
______ weight lifting → a state of sustained partial contraction
When calcium binds to ____, _____ releases tropomysoin, exposing the myosin binding sites → thick myofilaments