A cell that has undergone determination to become a neuron is placed in a non-neutral environment for muscle development. Does it become a neuron or muscle cell
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A cell that has undergone determination to become a neuron is placed in a non-neutral environment for muscle development. Does it become a neuron or muscle cell?
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- A cell that has undergone specification to become a neuron is placed in a non-neutral environment for muscle development. Does it become a neuron or muscle cell?If all nuclei are equivalent, what causes some cells to develop into neurons while others develop into skeletal muscle?One of the primary characteristics of all muscle tissue is contractility, the ability to shorten (contract) and lengthen (relax). You've identified the various components of a myofibril above. Now, use the table below to indicate what occurs to each band, line, or zone when the muscle contracts vs. relaxes. What occurs to this region / structure during contraction/relaxation? Region / Structure A-Band H-Band I-Band M-Line Z-Line Zone of Overlap Sarcomere No change Shortens Lengthens Muscle Contraction Muscle Relaxation
- Which component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsWhich of the following statements relating to the developmental aspects of muscles is false? a. All muscle tissue types arise from myoblasts b. Skeletal muscles become amitotic while smooth muscles regenerate throughout life c. Sarcopenia begins by age 30 and is irreversible d. Body strength per unit muscle mass is the same in both sexes e. none of the above Which of the following structures is located in the head region of the thick filament myosin? a. actin binding site b. ATP binding site c. ATPase enzyme d. all of the above e. none of the aboveHow would exposure to a sarin or sarin-like chemical affect calcium levels inside the sarcoplasmic reticulum (SR) of a skeletal muscle? Group of answer choices An increased frequency of action potentials would lead to decreased calcium levels in the SR A decreased frequency of action potentials would lead to decreased calcium levels in the SR An increased frequency of action potentials would lead to increased calcium levels in the SR A decreased frequency of action potentials would lead to increased calcium levels in the SR pick one answer
- Calmodulin is found in smooth muscle cells and performs a similar function to troponin in striated muscle fibers. However, calmodulin not only gets activated by Ca2+ but also slows the release of Ca2+ from the sarcoplasmic reticulum. How might this difference relate to the different kinds of contractions smooth muscles do in comparison to striated muscles?In myogenesis, the assembling sarcomeres are integrated with the extracellular matrix (composed of collagen and laminin), across the plasma membrane (sarcolamina) by the following Integrin-vinculin complex Dystrophin glyco protein complex by actinin that bind collagen and filamin that bind actin filaments a and b a and c b and c none of theseFrom which embryonic cell type does muscle tissuedevelop?a. ganglion cellsb. myotube cellsc. myoblast cellsd. satellite cells
- Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads b) Calcium release, binding sites on actin are exposedmyosin binds to actin c) Myosin binds to actin, myosin uses calcium, cell gets shorter d) Action potential is received , cell gets shorter, myosin grabs actinWhich of the following are aspects of the structure of skeletal muscle? Select all that apply. --They are cylindrical cells called muscle fibers that have multiple nuclei. --Skeletal muscle has more mitochondria than other types of muscle cells. --The muscle fibers parallel one another and have a striated appearance. --Cells are branched or unbranched with single nuclei. --Each fiber contains stacks of many units of contraction and protein filaments.Which of the following statements is unique to skeletal muscle? O a) skeletal muscle has striations O b) skeletal muscle is attached to bones O c) skeletal muscle is under voluntary control O d) skeletal muscle is multinucleated O all of the above O b, c, & d but not a