Biology - Muscular System - MCAT Practice Questions
Which type of muscle tissue is responsible for providing body support, movement, blood propulsion, and thermoregulation? Skeletal muscle
Skeletal muscle tissue is characterized by the presence of stripes, meaning it: Is striated
The repeating functional units found in striated muscle tissue are called: Sarcomeres
Skeletal muscle is unique among the three muscle types because it is under: Voluntary (somatic) control
Skeletal muscle cells are formed by the fusion of several precursor cells, resulting in a characteristic known as: Multinucleated
Muscle pairs whose actions oppose each other (e.g., the biceps and triceps) are known as: Antagonistic muscle pairs
Which type of skeletal muscle fiber is slow-twitch, high in myoglobin, and primarily carries out oxidative phosphorylation? Red fibers
Skeletal muscle fibers that are fast-twitch, low in myoglobin, and primarily rely on anaerobic metabolism are referred to by which color? White
Which type of muscle tissue forms the supporting tissue of hollow internal organs like the stomach, intestine, and bladder? Smooth muscle
Smooth muscle is described as "smooth" because it: Does not have the striations (sarcomeres).
Smooth muscle and cardiac muscle share the characteristic of being under: Involuntary (autonomic) control
The cells of smooth muscle tissue are typically: Uninucleated
Which type of muscle tissue is involuntary and striated, and constitutes the main tissue of the walls of the heart? Cardiac muscle
Cardiac muscle cells are physically and electrically connected to one another by specialized structures called: Intercalated discs
Intercalated discs in cardiac muscle contain which type of intercellular junctions that allow for the direct flow of ions between cells, enabling rapid, synchronized contraction? Gap junctions