Q: A typical relaxed sarcomere is about 2.3 μm in length and contracts to about2 μm in length. Within…
A: The muscles fibers are composed of myofibrils and in turn myofibrils are composed of myosin and…
Q: Bank: A. Contraction C. Relaxation B. Myosin filament D. Actin filament C. Endocrine E. Contact…
A: A group of cells that have similar structure and that function together as a unit are known as the…
Q: Actin filaments in microvilli require the help of myosin so that they can associate with the…
A:
Q: During muscular contraction, cross-bridges form between _____ and _____ . Multiple Choice a)…
A: Muscles are all composed of a kind of elastic tissue. Each muscle is made up of thousands, on the…
Q: Which item is biggest? A. myosin head B. myofibril C. troponin D. sarcomere
A: Muscles are compact structures made up of highly tensile , strong, long, multinucleated cells called…
Q: A thick filament is made up of Select one: a. myosin and regulatory filaments b. actin and…
A: Muscular contraction is caused by the interaction between actin and myosin as they temporarily bind…
Q: Myosin heads bend when attached to actin
A: Correct option is C Myosin heads bend when attached to actin
Q: An important protein in contractile muscle. OA. keratin O B. myosin O c. elastin OD. fibrin
A: The proteins have a variety of functions in the body. The functions of the proteins in the body are…
Q: Explain Structure of myosin
A: Myosin is a protein that belongs to the class of molecular motor proteins. This class comprises two…
Q: In a myofibril, the light central region of an A band is called... O I band O M line O Z band O H…
A: In a myofibril, the light central region of an A band is called H zone.
Q: I= band at the time of relaxation H= zone at the time of relaxation Sacomere at the time of…
A: During the muscle cell contraction, the sarcomere must shorten. However, thick and thin filaments…
Q: During contraction, the bulk of calcium comes from: A. sarcomere B. sarcoplasm…
A: There are two questions. One question has been answered. To get the answer for the other question,…
Q: Explain myosin regulatory lightchain
A: When a cell is destined for division, first its nuclear content would be shared between cells. It…
Q: Multinucleated smooth muscle results from the fusion of embryonic mesenchymal cells called myoblasts…
A: Although the human body is a singular entity, it is composed of billions of smaller entities of the…
Q: How would a myosin head mutant unable to bind ATP likely influence the myosin Il cycle? The myosin…
A: Skeletal muscles are a special type of muscles made up of contractile tissue. They are a type of…
Q: According to the sliding filament theory: a. The tension increases linearly as actin-myosin overlap…
A: Introduction : The sliding filament theory states that the myosin filaments which are thick…
Q: The tendon of a muscle O Is don
A: Tendons are tissues that attach a muscle to other parts of the body like bones. They are the…
Q: 5. LABEL the following features on the figure to the RIGHT: insertion, origin, tendon, muscle Now…
A: Muscle tissue is a well-vascularized soft tissue present in the muscles of animal body. Muscle…
Q: The power stroke Multiple Choice Positions the myosin heads in their high-energy pos Pulls the thin…
A: power stroke of muscle contraction -It is the pivoting of myosin heads to pull filament toward the m…
Q: Alter death, calcium pumps no longer fünction and the calcium ion concentration of muscle fiber…
A: * After death of an animal or organism the calcium pump stops hence calcium should not be pumped and…
Q: What do the calcium ions that are released into the cytoplasm during contraction bind to?…
A: At the point when the muscle is stimulated during contraction, calcium particles are delivered from…
Q: What do you mean by myosin myofilaments?
A: Muscles consist of munerous muscle fibres. Each muscle fibre contains many myofibrils having…
Q: Which of the following regions of a sarcomere at rest is characterized by the presence of myosin…
A: Myofibrils are made up of sarcomeres, It gives striated appearance to the skeletal muscles because…
Q: 5. Diagram the structure and organization of the actin and myosin filaments including the myosin…
A: Note- As we are allowed to do only one question at a time so I will provide answer to one question…
Q: Why is myosin II the only myosin capable of producing contractile force?
A: Introduction Myosins are a group of motor proteins that play a key role in muscle contraction and a…
Q: The ATPase activity of myosin protein is found in,
A: Myosin is a class of molecular motor proteins that plays an essential role in the contraction of the…
Q: Indicate whether the sentence is True or False During the cross-bridge cycle, ATP binding to myosin…
A: Repeated relaxation and contractions in Skeletal muscles are responsible for the movement and…
Q: Myosin myofilaments area. attached to the Z disk.b. found primarily in the I band.c. thinner than…
A: The actin-myosin interaction is most commonly known for its role in sliding filament theory, where…
Q: [ANIMAL PHYSIOLOGY] When animals die, the muscles stiffen in rigor mortis because. Select one: O a.…
A: Rigor mortis is a phenomenon occurring in the body when the body dies. It is a postmortem…
Q: // A mutation has occurred in a mouse's myosin II gene making it non-functional. Name all that are…
A: Contractile ring contain filamentous actin and myosin II motor protein. RhoA is responsible for…
Q: ge-sensitive protein nels open and allow Acetylcholi syn elease from terminal of the SR. Ca2+ flows…
A: The skeletal muscle cells and neurons can get excited as they have a capacity to generate the action…
Q: If the number of myosin heads were doubled, what would be the effect on force production? ATP…
A: Myosin are cellular proteins that are involved in many cellular functions. In cell division, they…
Q: 51- are links between the Filamentous F-actin of thin filaments and myosin heads of thick filaments.…
A: Introduction Muscle contraction is the activation of tension-generating sites within muscle cells,…
Q: Thin and thick filaments are organized into functionalunits called ________.a. myofibrilsb.…
A: Myofibrils are made up of myofilaments. These myofilaments are myosin and actin. T-tubules are the…
Q: The shortening of _____________ will cause the shortening of a muscle fiber
A: A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main…
Q: Mutations in myosin
A: myosin is a motor protein most notably involved in muscle contraction. Small genetic mutations in…
Q: The cells of muscles, myocytes, develop from________.a. myoblastsb. endodermc. fibrocytesd.…
A: Cells are the basic structural and functional unit of an organism. The level of organisation of the…
Q: ce: 63. Sección Largest 64. 65. 66. 67. Smallest A. Calcium В. Мyofibril . Myofilament ||||
A: Skeletal, smooth, and cardiac muscles is usually define as the way the they are supposed to make up…
Q: Please order the steps of myofilament movement. Myosin heads are "energized" by the presence of ADP…
A: The acting is a component of cytoskeleton protein. It is responsible for muscle contraction together…
Q: Arrange the steps in the correct order to explain how a muscle fiber contracts. Myosin and actin…
A: The movement of muscles in the body in response to a stimulus is so quick that it is difficult to…
Q: The A-band includes overlapping myosin fibers only both actin and myosin fibers actin, troponin and…
A: Muscle contraction Actin and myosin are proteins that are found in the muscles, which work together…
Q: Smooth muscles relax when: a) myosin kinase phosphorylates the myosin head b) myosin phosphatase…
A: Smooth muscles relax when myosin phosphatase removes a phosphate group from myosin. (Option B is…
Q: can fit between actin filaments that have _____ crosslinkers, converting them to _bundles Myosin II,…
A: Myosin and actin are the motor proteins involved in the contraction of muscles.
Q: A sarcomere contracts when a) Thin filaments (actin) slide b) Thick filaments (myosin) slide c) Thin…
A: Muscles form an important system in our body and functions in locomotion and body movement. They…
Q: 1. actin 2. myosin shafts 3. myosin heads V D 4. thin filament - VE 5. thick filament - V F 6.…
A: A - 3. Myosin head B - 4. thin filament C - 2. Myosin shafts D - 1. Actin
Q: ansverse (T) tubules are parts of. . O A. all answers are correct O B. Sarcoplasmic reticulum OC.…
A: The protracting parts of the cell membrane are known as transverse tubules. Both skeletal and…
Q: The thick filament is composed almost entirely of _____ molecules. (This is a multiple choice…
A: Each organized skeletal muscle in our body is made up of a number of muscle bundles or fascicles ,…
Q: is the collective term for actin and myosin. sarcomere O myofibrils O muscle hiber O skeletal muscle
A: The basic contractile unit of muscle fibre is the sarcomere. Actin and myosin are the active…
Q: Binds calcium in skeletal muscle cells Occurs in smooth muscles only 1. 2. Is the primary source of…
A: Muscle is a soft tissue found in animals which consists of actin and myosin that slides over each…
Q: Can you match the sacromere anatomy with the proper answer from the list below the table graph?…
A: A typical myofibril have striated appearance due to he presence of light bands and dark bands. The…
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- QUESTION 9 Which of the following is/are a motor protein(s) that can carry vesicles along microtubules? A Dynein B Kinesin C Myosin D Tau E A and BQUESTION 10 Which of the following is NOT true of intermediate filaments? A They provide mechanical strength to cells. B They are composed of 8 oppositely oriented tetramers that are assembled into a rope-like filament. C They have a non-polar orientation. D They are rigid and do not deform before breaking E Keratins, neurofilaments, vimentin, and desmin are examples of intermediate filaments.QUESTION 15 Which of the following molecules is NOT a component of desmosomes? A Intermediate filaments B Actin C Plakoglobin D Desmoplakin E Desmocolin
- QUESTION 11 What is the molecular explanation for the observation that the I band appears to shorten in a muscle sarcomere that is undergoing contraction? A The actin filaments shorten. B The sarcomere is disassembled. C a and b D The myosin filaments walk along the actin filaments towards the Z-line to increase the amount of overlap between actin and myosin. E The myosin filaments shorten.QUESTION 6 Which of the following is NOT an example of an intermediate filament? A Neurofilaments in neuronal cells B Keratins in epithelial cells C Nuclear lamins in most cells D Laminin in the basement membrane E Vimentin in fibroblast cellsQUESTION 7 Which of the following filaments has the highest tensile strength? A Actin filaments B Microtubules C Intermediate filaments D All of the above E None of the above
- QUESTION 13 What is the mechanism by which microtubules can rapidly shrink, or undergo â catastrophe?â A At low levels of ATP, tubulin subunits are not added to the + end of the microtubule. B At low levels of GTP, beta-tubulin subunits at the + end of the microtubule hydrolyze GTP, undergo a conformational change, and destabilize the filament so that the filament starts to disassemble from the + end. C At low levels of GTP, tau proteins are phosphorylated and bind to the microtubule to destabilize the + end. D At high levels of GTP, tubulin subunits are more quickly added to the â end than to the + end of the microtubule, resulting in a shrinking + end of the microtubule. E At low levels of ATP, the microtubules rapidly disassemble since ADP-bound tubulin subunits are lost at both the + and â ends of the filament.QUESTION 4 Which of the following G protein subunits activate K+ channels in response to the GPCR for acetylcholine on heart muscle? a. Galpha inhibitory. b. G alpha stimulatory c. G beta gamma dimer. d. G alpha transducin.Question 3 During muscle contraction, the agonist while the antagonist 1. Shortens; lengthens 2. Remains unchanged; lengthens 3. Shortens; remains unchanged 4 lengthens; shortens
- Question 6 Which of the following statements about graded potentials and action potentials is true? Answers: a. Action potentials are triggered through the passive spread of membrane depolarization. b. Graded potentials can by produced by the net movement of Nat, CI, or K* across the plasma membrane. c. Graded potentials can occur as the result of either hyperpolarization of depolarization of the plasma membrane. d. All of the statements are true. e. The duration of a graded potential is related to the duration of the stimulus.QUESTION 14 Which of the following statements is FALSE? A Microtubules will rapidly disassemble in response to a drop in the ATP concentration. B G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. C Microtubules are stabilized by microtubule-binding proteins, such as Tau. D Actin-binding proteins allow F-actin to assemble in cells in many different ways. E Hydrolysis of ATP and GTP changes the conformation of the monomers once they are incorporated into actin filaments and microtubules, respectively.QUESTION 13 Match each of the following to its role in the cell. - A. B. C. D. E. F. G. H. Microtubules - A. B. C. D. E. F. G. H. Actin - A. B. C. D. E. F. G. H. Tubulin - A. B. C. D. E. F. G. H. Intermediate filaments - A. B. C. D. E. F. G. H. Kinesin - A. B. C. D. E. F. G. H. Dynein - A. B. C. D. E. F.…