Interactions between actin and myosin filaments of the sarcomere are responsible for
A) muscle fatigue.
B) the conduction of neural stimulation to the muscle fiber.
C) muscle contraction.
D) muscle relaxation.
E) the striped appearance of skeletal muscle.
Answer: C
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Some proteins, like hemoglobin or antibody molecules, require multiple polypeptide chains to come together to act as a single protein. If the association among the different polypeptide chains is blocked, the ________ structure of the protein is destroyed.
A) primary B) secondary C) tertiary D) quaternary E) binary
Triceps brachii is assisted in extension of the elbow by the synergistic muscle
A) extensor digitorum. B) anconeus. C) brachialis. D) pronator teres. E) extensor olecranis.
Acetyl coenzyme A enables the products of glycolysis to enter the citric acid cycle.
Answer the following statement true (T) or false (F)
A motor neuron and all the muscle fibers it controls is called a ________
A) neuromuscular junction B) threshold stimulus C) motor nerve D) motor unit