3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic (OJO) A muscle fiber is made by the parallel apposition of sarcomers. Generation of force relies on the formation of cross-bridges between actin and myosin filaments. In the process of contraction, adenosine triphosphate (ATP) is required both to drive the actin-myosin association-dissociation cycle and to recycle calcium back to the endoplasmic reticulum. Each muscle fiber is innervated by one neuron only. T tubules are plasma membrane invaginations of the sarcolemma that allow excitation-contraction coupling.

Q: Smooth muscle has actin/myosin, why is it not striated? (consider what striation can provide). What…

A: Types of muscles There are three major types of muscles in humans. These are, Skeletal muscle…

Q: n order to study and understand muscle diseases, one needs to have a good understanding of normal…

A: Muscles contract in a repeated pattern of binding and releasing between the two thin and thick…

Q: 3) List and define the organizational structure of skeletal muscle beginning with the sacrcomere up…

A: Skeletal muscles make up the most part of our muscles. They account for around 30 to 40 percent of…

Q: 11. Arrange the following in statements in the order that they occur, by adding a number: nf.e ACh…

A: In the above question, given statement is about the mechanism of muscles contraction and relaxation.…

Q: The dark A band of a sarcomere contains regions where the actin and myosin filaments overlap.  True…

A: The sarcomere is the basic unit of muscle fibers that is responsible for the contractile function.…

Q: A typical relaxed sarcomere is about 2.3 um in length and contracts to about 2 um in length. Within…

A: a) To find: The overlap of thick and thin filaments in the relaxed and contracted sarcomere

Q: true or false 6. Muscle cells are mesenchymal in origin. 7. Myomesin binds to titin molecules and…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

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: 38. Which of the following (are) is true when 50% of the motor units are stimulated?   A. the…

A: A motor unit is composed of a Motor neuron and the skeletal muscle fibers supplied (innervated) by…

Q: Part 1 of 1- Question 1 of 1 During the actin-myosin ATP cycle, if there is no action potential on…

A: The phenomenon in physiology which involves generating tension at specific sites of the muscle is…

Q: Actin filaments in microvilli require the help of myosin so that they can associate with the…

A:

Q: 1. Which myosin type II property is most different from kinesin-1? A) myosin has two heads that can…

A: The actin-myosin interaction is most commonly known for its role in sliding filament theory, where…

Q: 35- which of the following is least likely to be a feature for brief- movement muscle: A.…

A: During muscle movement/contraction, CNS send signal through motor neurone which releases Ach at…

Q: 2.If you were running an experiment and interrupted the interaction between thin and thick…

A: Introduction :- When a sarcomere (a) contracts, the Z lines become closer together and the I band…

Q: Discuss about Ca2+-dependent thin-filament regulation of skel-etal muscle contraction.

A: Movement of skeletal muscle in mammalians show large variability in its functions with their…

Q: 83% of the total number of fibers examined in the vastus lateralis and nearly 61% of the…

A: Fast-twitch muscles fibers : These muscles are specialized for powerful forces but can be employed…

Q: 9. Which of the following correctly describes the end plate potential (EPP)? A)It is primarily…

A: End plate potentials (EPPs) are the voltages which cause depolarization of the muscle fibers caused…

Q: In both smooth and skeletal muscle calcium must be actively transported out of the fluid surrounding…

A: As per our honor code, we are authorized to answer only one question at a moment. As you have not…

Q: When training for a marathon, some muscle fibers will switch from being fast glycolytic to slow…

A: Option 1 is the answer. Type1 myosin fibres are effective for long periods of time.They undergoes…

Q: 21) The Sliding Filament Theory agrees with which type(s) of muscle contraction produced by a muscle…

A: Sliding filament theory suggests the muscular contraction mechanism. As per this theory, moter…

Q: 34- Which of the following sentences is incorrect: a- Muscle fibers and neurons are similar because…

A: there needs a correction in question part. it is saltatory conduction.

Q: What structures/s is/are responsible for the banding pattern in skeletal muscle cells? (EXPLAIN)…

A: Striated muscles are generally voluntary muscles that are under the conscious control of brain.…

Q: number graded recruitment constant summation contraction Not all muscle contractions are of equal…

A: The muscle fiber helps in the process of muscle contraction, which helps in the movement.  When the…

Q: Muscle contraction is the result of critical steps characterized by conformational changes to…

A: Muscle contraction is the result of critical steps characterized by conformational changes to…

Q: Describe the process of skeletal muscle contraction, beginning with an action potential in a motor…

A: Skeletal muscles are voluntarily controlled.

Q: 17. Which of the following choices is CORRECT? A. Myofibrils extend the length of a muscle fibre B.…

A: Muscles are soft tissues present in most animals. They contain protein filaments called actin and…

Q: A healthy 32-year-old man lifts weights regularly as part of his workout. In one of his biceps…

A: The muscle fibers contain myofibrils that are composed of repeating units of contraction called the…

Q: The sliding-filament model of skeletal-muscle contraction assumes a sliding or slipping of…

A: Muscle contraction occurs due to nerve stimulation. The striated muscle cell is tube-shaped and…

Q: The sliding filament model of contraction involves O the shortening of thick filaments so that thin…

A: The mechanism that takes place within the muscles for contraction is described by the sliding…

Q: 9. The binding of the myosin head to the free binding site of the actin filament results in the…

A: Introduction  Actin and myosin, coupled with the regulatory proteins known as troponin, tropomyosin,…

Q: Provide one difference and one similarity in the process of contraction of smooth, skeletal, and…

A: Muscles are divided into three categories: cardiac, smooth, and skeletal. Cardiac muscle is found in…

Q: Give an account of the excitation-contraction coupling (Figure 3) in skeletal Highlight the role of…

A: Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be…

Q: 17. Which of the following choices is CORRECT? A. Myofibrils extend the length of a muscle fibre B.…

A: Muscle is a soft tissue that helps in movement of the body, maintains posture, and circulates blood…

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: The concentration of Ca++ in the cytoplasm of the muscle fiber is [ Select ] than that of the…

A: Answer : the concentration of Ca++ in the cytoplasm of the muscle fibre Is lower than that of the…

Q: Muscle fibres cannot be distinguished/classified using which criteria? 1.Location 2.Elasticity…

A: The Muscle is a soft tissue that is responsible for producing force and motion facilitated by the…

Q: 29. What is the role of tropomyosin in muscle contraction? O to prevent myosin from continuing to…

A:

Q: 8. Which of the • A. The next contraction will be bigger than the previous contraction. • B. The…

A: Answer. Calcium ions are very important for muscle contraction. When a muscle is initiated by an…

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: what happens to skeletal muscle if there is no ATP present but plenty of calcium. Be specific…

A: Sliding filament theory is the most widely accepted explanation for muscle contraction. It states…

Q: 18. The binding of calcium to troponin will directly cause A. the hydrolysis of ATP B. the binding…

A: Troponins are a group of proteins that are found in the skeletal and muscle fibres of the heart. It…

Q: is the role of stored creatine phosphat

A: As we know The human body consists of various systems that function together to carry out their…

Q: For the hierarchy of skeletal muscle organization, which accurately lists the order of structures…

A: The smallest functional unit of skeletal muscle organization is sarcomere. It is a highly organized…

Q: 22. There are three types of muscle fibers, which differ in terms of how fast they contract and how…

A: The muscle fiber is an individual muscle cell that consists of hundreds or thousands of myofibrils.…

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: Contraction of muscles requires binding of various components of muscle fiber. Which of the…

A: Introduction Muscle contraction can be defined as the activation of tension-generated sites within…

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…

Q: Explain what how the muscle cell maintains resting membrane potential and explain the two main parts…

A: According to our guidelines we are allowed to answer single question at a time. So if you want to…

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.