A&P Final Chapter 9 Created by d4ni3lle
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The thin filaments (actin) contain a polypeptide subunit G actin that bear active sites formyosin attachment True
A motor neuron and all the muscle cells that it stimulates are referred to as a motor endplate False
Peristalsis is characteristic of smooth muscle. True
A contraction in which the muscle does not shorten but its tension increases is called isometric True
One of the important functions of skeletal muscle contraction is production of heat. True
What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin is the name of a contracting unit.
B) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
C) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
D) Tropomyosin is the receptor for the motor neuron neurotransmitter. B)
The strongest muscle contractions are normally achieved by ________.
A) increasing stimulus above the threshold
B) increasing stimulus above the treppe stimulus
C) increasing the stimulation up to the maximal stimulus
D) recruiting small and medium muscle fibers C)
Excitation-contraction coupling requires which of the following substances?
A) Ca2+ and ATP
B) Ca2+ only
C) ATP only
D) ATP and glucose A)
A) breaks down glycogen
B) is a protein involved in the direct phosphorylation of ADP
C) stores oxygen in muscle cells
D) produces the end plate potential C)
What structure in skeletal muscle cells functions in calcium storage?
A) sarcoplasmic reticulum
C) intermediate filament network
D) myofibrillar network A)
What does oxygen deficit represent?