Fast glycolytic muscle fibers do not fatigue quickly due to their rich supply of myoglobin?
Anaerobic respiration produces lactic acid as a by-product but creates more ATP for muscle contraction when compared to aerobic respiration?
What is the neurotransmitter released from motor neurons initiating muscle contraction?
Which choice best describes the function T-tubules have within muscle contraction?
A. Transmit the action potential deep into the muscle cell
B. Store and release calcium ions into the cell interior for muscle contraction
C. Store glycogen
D. Help align the thick and thin filament for contraction
A motor unit is all the nerves that innervate all of the muscle fibers of one muscle?
Which choice best describes what a fascicle is?
A. Connective tissue covering around the entire muscle
B. Bundle of myofilaments
C. Bundle of muscle myofibrils
D. Bundle of muscle fibers enclosed by connective tissue
What answer is NOT true regarding muscle contraction?
A. The sarcoplasmic reticulum stores the calcium ions that are released within the muscle cell
B. Tropomyosin protein covers the binding sites on the actin protein where the thick filament will bind to actin
C. Acetylcholine is the neurotransmitter that binds to the sarcolemma
D. ATP is needed for the thick filament to bind to the thin filament
What structure separates one fascicle from another in a muscle?
Which statement is NOT true regarding slow oxidative muscle fibers?
A. They can contract slowly but for sustained period of times
B. Appears white in color within a specimen
C. They contain myoglobin
D. It is fatigue resistance
Which choice best describes the function of myoglobin?
A. Assists attaching the thick filament to the thin filament
B. Provides a small reserve supply of oxygen for the muscle cell
C. Stores glycogen
D. It is specialized protein on the thin filament
Which statement is NOT true regarding muscle contraction?
A. Actin is the protein on the thin filament that binds to the thick filament
B. The thick filament is composed of the myosin protein
C. Calcium ions bind to the tropomyosin protein
D. The sarcoplasmic reticulum stores the calcium ions that is released within the muscle cell during contraction
Which statement best describes a sarcomere?
A. It is the plasma membrane of the muscle fiber
B. It provides an anchor for the thick and thin filament
C. It is the smallest contractile unit of a muscle fiber
D. Store and release calcium ions into the cell interior for muscle contraction
Which statement is true regarding muscle contraction?
A. The T-tubules store the calcium ions within the internal part of the muscle cell
B. Tropomyosin protein binds to the myosin protein
C. ATP is needed to release the thick filament from the thin filament
D. The power stroke occurs when the thick filament binds to the thin filament
What factor is NOT required for the process of muscle contraction to occur?
A. Cross bridging of the thick and thin filament
B. Acetylcholine must be bound to the sarcolemma
C. Presence and production of adenosine triphosphate (ATP)
D. Sodium ions to be present within the muscle fiber’s cytoplasm
What statement is true of smooth muscle?
A. It is found mainly within internal organs such as the bladder and uterus
B. Its contraction is controlled by the same mechanism as skeletal muscle
C. It only contracts through conscious control
D. It has a striated appearance when viewed under a microscope