12 Questions
Which type of motor unit is responsible for gross contractions in skeletal muscle?
Large motor units
What is the main elimination method for acetylcholine (ACh) at the neuromuscular junction?
Enzymatic degradation
Which receptors are involved in the end plate of skeletal muscle?
Nicotinic 1 (N1 or Nm)
Which protein inhibits the binding site for myosin heads on actin filaments?
Tropomyosin
What is the function of Troponin I in the sarcomere?
Inhibits tropomyosin
Which band in the sarcomere contains both thick and thin filaments?
A band
Which ion is released into the cytoplasm during excitation-relaxation coupling in skeletal muscle?
Calcium ions
What is the role of acetylcholine (ACh) in excitation-relaxation coupling in skeletal muscle?
It triggers the opening of cation channels
Where are nicotinic receptors located in skeletal muscle?
End plate
During muscle contraction, what happens to troponin-tropomyosin complex?
It is removed from the myosin binding sites on actin
What is the role of ATP in muscle contraction?
It allows myosin heads to detach from actin and reattach to another binding site
How is muscle relaxation achieved?
By the sequestration of calcium ions by SERCA
Test your knowledge on motor units, neuromuscular junctions, and neurotransmitters in this quiz. Learn about the classification of motor units and their role in skeletal muscle contractions. Explore the functions of large and small motor units and their effects on gross and fine movements.
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