nebulin is an example of.... in the skeletal muscle O A. Contractile proteins O B. Structural proteins OC. Regulatory proteins O D. all answers are wrong
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- The Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosinWhat role (function) does calcium have within a muscle fiber? a. trigger muscle potentials along t-tubules b. trigger contraction by causing the formation of cross bridges c. trigger exocytosis of ACh across the synaptic space d. trigger action potentials along axons e. open voltage gates within the sarcoplasmic reticulum 2. Which of the following are regulatory proteins that allow a muscle fiber to contract when calcium is present? (select all that apply) dystrophin troponin myosin tropomyosin actin 3. During this phase of an action potential, potassium ions exit the cell through voltage gated potassium channels. a. depolarization b. repolarization c. glycolysis d. cross bridge formationburst of Calchu musc res an ldum Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 20. A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct. to an ent. response to an ertraceil m-current
- Which of the following statements relating to smooth muscle is true? a. single-unit smooth muscles contract rhythmically due to gap junctions b. multi-unit smooth muscles are arranged like skeletal muscle motor units c. visceral smooth muscles exhibit spontaneous action potentials d. multi-unit smooth muscles exhibit graded contractions in response to neural stimuli e. all of the aboveWhat causes the striated appearance of skeletal muscle? O a. presence of gap junctions O b. regular arrangement of highly organized thick and thin filaments presence of the mitochondria at regular intervals O d. regular arrangement of the T tubules running transversely through the muscle fibreWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striations
- 1 . Which of these characteristics describe smooth muscle cells, but not skeletal or cardiac muscle? Group of answer choices a . cell contraction results in some type of movement within the body b. cells become excited as they respond to stimulus from the nervous system c. cells can extend passively when the contraction phase is complete d. cells are mitotic and can divide and undergo hyperplasia as needed If the sarcolemma of the muscle cell is polarized the muscle is likely in this state Group of answer choices a. resting b. refractory c . Kansas d. neutral e. depolarized Which of the following does not correctly describe a way that muscles can be attached to bones? Group of answer choices by a ligament direct fusion to periosteum by a tendon by an aponeurosisSkeletal, smooth, and cardiac muscle are similar in that they all _____. A are divided into motor units B require calcium in order to contract C undergo mitosis frequently to replace dead or damaged cells D have small round cells connected by gap junctionsWhich of the following statements about the connective sheath of skeletal muscle is false? a. the endomysium wraps around every single muscle fiber b. the perimysium wraps around groups of muscle fibers c. the epimysium wraps around the whole muscle organ d. all of the above e. none of the above
- Which of the following properties is not common to allthree muscle tissues?a. excitabilityb. the need for ATPc. at rest, uses shielding proteins to cover actinbindingsitesd. elasticitySingle-unit smooth muscle cells can stimulate each other because they havea. a latch-bridge.b. diffuse junctions.c. gap junctions.d. tight junctions.e. cross-bridges.25. The large muscle protein that essentially "anchors" the thin-filaments to the cell During membrane and extracellular matrix and is also the muscle protein that plays a role believe in the disease known as, muscular dystrophy, is: elutar Caldum caused by sweating. ocellular Pocasium and incresse in intracellular ADP caused by the The A. actin 0. Th B. myosin act C. dystrophin le fibers C The D. tropomyosinized temperatire A. muscie foers
