Page 2 of4 48) Which of the following is an excitatory neurotransmitter secreted
ID: 3482783 • Letter: P
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Page 2 of4 48) Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? A) gamma aminobutyric acid B) norepinephrine C) acetylcholine D) cholinesterasee 49) The major function of the sarcoplasmic reticulum in muscle contraction is to A) provide a source of myosin for the contraction make and store phosphocreatine C) synthesize actin and myosin myofilaments D) regulate intracellular calcium concentration 50) Articular cartilage found at the ends of the long bones serves to A) form the synovial membrane B) attach tendons C) produce red blood cells (hemopoiesis) D) provide a smooth surface at the ends of synovial joints 51) Blood within the pulmonary veins returns to the A) left atrium B) left ventricle C) right atrium D) right ventricle 52) What kind of tissue is the forerunner of long bones i the embryo? A) fibrocartilage B) elastic connective tissue C) hyaline cartilage D) dense fibrous connective tissue 53) Creatine phosphate functions in the muscle cell by A) storing energy that will be transferred to ADP to resynthesize ATP B) forming a chemical compound with actin C) inducing a conformational change in the myofilaments Dy forining a temporary chemical compound with myosin 54) Most skeletal muscles contain A) a mixture of fiber types B) a predominance of fast oxidative fibers C) muscle fibers of the same type D) a predominance of slow oxidative fibers 55) What makes up the axial skeleton? A) the skull, vertebral column, and rib cage B) arms, legs, hands, and feet C) the skull, vertebral column, and pelvis D) shoulder and pelvic girdlesExplanation / Answer
48. The excitatory neurotransmitter secreted by the motor neurons innervating muscle is ACETYLCHOLINE.
49. The major function of sarcoplasmic reticulum in muscle contraction is REGULATING INTRACELLULAR CALCIUM CONCENTRATION.
It acts as a storehouse of calcium and releases it into the cytoplasm during muscle contraction, so that excitation contraction coupling could take place.
50. Articular cartilage at the ends of long bones serve to PROVIDE A SMOOTH SURFACE AT THE END OF SYNOVIAL JOINT.
It facilitates easy transfer of load by reducing frictional resistance.
51. Blood within the pulmonary veins returns to LEFT ATRIUM.
In the heart, blood follows the following path: right atrium, right ventricle, pulmonary arteries, pulmonary capillaries, pulmonary veins, left atrium, let ventricle, aorta.
52. HYALINE CARTILAGE is the forerunner of long bones in the embryo.
53. Creatine phosphate functions in the muscle cell by STORING ENERGY THAT WILL BE TRANSFERRED TO ADP TO RESYNTHESIZE ATP.
54. Most skeletal muscles contain A MIXTURE OF FIBER TYPES.
55. SKULL, VERTEBRAL COLUMN AND RIB CAGE form the axial skeleton.
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