front 1 Which of the following is not a function of smooth muscle tissue? forcing urine out of the urinary tract altering the diameter of the respiratory passageways elevating hairs on the arm forcing blood from the heart into the major arteries moving food materials along the digestive tract | back 1 elevating hairs on the arm |
front 2 Which of the following surrounds the individual muscle cell? perimysium endomysium epimysium fasicle | back 2 endomysium |
front 3 When a muscle is unable to respond to stimuli temporarily, it is in
which of relaxation period refractory period latent period fatigue period | back 3 refractory period |
front 4 The functional role of T-tubules is to? stabilize the G and F actin relay the action potential to the interior of the muscle fiber. hold cross bridges in place in a resting muscle synthesize ATP to provide energy for muscle contraction | back 4 relay the action potential to the interior of the muscle fiber. |
front 5 Calcium ions bind to the ________ molecule in skeletal muscle cells. actin tropomyosin troponin myosin | back 5 troponin |
front 6 The complex known as the triad consists of: actin, myosin and tropomyosin transverse tubules and terminal cisternae myofilaments, myofibirils and sarcomeres A band, H band, and I bands actin, myosin, and sarcomeres | back 6 transverse tubules and terminal cisternae |
front 7 The sliding filament model of contraction involves: actin and myosin sliding past each other but not shortening the shortening of thick filaments so that thin filaments slide past actin and myosin shortening but not sliding past each other the Z discs sliding over the myofilaments | back 7 actin and myosin sliding past each other but not shortening |
front 8 Myoglobin: holds a reserve supply of oxygen in muscle cells breaks down glycogen is a protein involved in the direct phosphorylation of ADP produces the end plate potential | back 8 holds a reserve supply of oxygen in muscle cells |
front 9 The following is a list of the events that occur during a muscle contraction. 1. Myosin cross-bridges bind to the actin. 1, 4, 6, 2, 3, 5. 3, 5, 1, 4, 6, 2. 3, 5, 1, 2, 4, 6. 1, 3, 5, 4, 6, 2. 5, 1, 4, 6, 2, 3. | back 9 3, 5, 1, 2, 4, 6. |
front 10 Because skeletal muscle contractions demand large quantities of
ATP, a rich nerve supply. a rich blood supply. abundant mitochondria. A, B, and C both B and C | back 10 A, B, and C |
front 11 During anaerobic glycolysis oxygen is not consumed. pyruvic acid is produced. ATP is produced. all of the above B and C only | back 11 all of the above |
front 12 The types of muscle tissue include all of the following, except skeletal muscle. smooth muscle. cardiac muscle. striated muscle. none of the above | back 12 striated muscle. |
front 13 An excitatory neurotransmitter secreted by motor neurons
innervating acetylcholine gamma aminobutyric acid cholinesterase norepinephrine | back 13 acetylcholine |
front 14 The major function of the sarcoplaslmic reticulum in muscle
contraction is make and store phosphocreatine synthesis actin and myosin myofilaments provide a source of myosin for the contraction process regulate intracellular calcium concentration | back 14 regulate intracellular calcium concentration |
front 15 At rest, active sites on the actin are blocked by: myosin molecules troponin molecules tropomyosin molecules calcium molecules ATP molecules | back 15 tropomyosin molecules |
front 16 Creatine phosphate functions in the cell by: forming a temporary chemical compound with myosin forming a chemical compound with actin inducing a conformational change in the myofilaments storing energy that will be transferred to ADP to resynthesize ATP as needed | back 16 storing energy that will be transferred to ADP to resynthesize ATP as needed |
front 17 Of the following muscle types, which has only one nucleus,
sarcomeres, and visceral smooth muscle multiunit smooth muscle cardiac muscle skeletal muscle | back 17 cardiac muscle |
front 18 Which of these would lead to increased oxygen consumption? increased heat production increased muscle activity increased aerobic respiration by muscle cells increased conversion of lactic acid to glucose all of the above | back 18 all of the above |
front 19 An anaerobic metabolic pathway that results in the production of two
net the citric acid cycle glycolysis hydrolysis the electron transport system | back 19 glycolysis |
front 20 The functional unit of skeletal muscle is the: sarcolemma sarcomere sarcoplasmic reticulum myofibril myofilament | back 20 sarcomere |