What is the function of calcium in muscle contractions? to bind to troponin and change its interaction with tropomyosin to alter membrane potential causing a depolarization to bind to myosin and allow it to attach to tropomyosin to release ADP from myosin

Q: Match each protein with the appropraite myofilament

A: The sliding filament model, developed by Hugh Huxley and Jean Hanson and Andrew Huxley and Ralph…

Q: What intracellular protein of smooth muscle cells binds calcium and leads to contraction?…

A: Smooth muscles or involuntary muscles are types of muscles found in visceral organs. These…

Q: A mutation in troponin that increased its affinity for its ligand would lead to

A: Troponin protein helps to make muscle in rest Condition with the help of tropomyosin protein

Q: Most skeletal muscles contain which of the following? O fast twitch fibers O slow twitch fibers O…

A: * Skeletal muscle functions in voluntary actions hence called as voluntary muscle. *Skeletal muscles…

Q: depolarization of the transverse tubules (T-tubules) promote

A: Every cell in the body has a cell membrane which separate it from the external environment of the…

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

A: The cytoskeleton is defined as a complex, dynamic network of interconnecting protein filaments which…

Q: Looking at this diagram explain the order of size dependent recruitment of motor units during muscle…

A: Car rental refers to the performance of additional vehicles to achieve increased contraction…

Q: Which protein is responsible for blocking the myosin binding site to actin, while the muscle is at…

A: Myosin and actin slides onto each and plays a major role in muscle contraction..

Q: In relaxed muscle, the myosin-binding site on adin is blocked by ?

A: Step 1 Contractile elements of muscle fibre are myofibrils. They are made up of contractile units…

Q: Which of the following polymerase Il play a key role in? Please make sure to select ALL correct…

A: RNA polymerase II is an enzyme found in eukaryotic cells . Precursors of mRNA are formed by…

Q: Which of the following are correct     Dynein head elongates like a lever arm.     ATP…

A: Movement of the body part is done by contraction and relaxation of contractile proteins.…

Q: Certain multi-headed myosins bind cooperatively to actin filaments. The binding interaction is…

A: As seen in the graph, when one aminoacid asp residue changes into leucine amino acid in eachs…

Q: the given below option what step causes a sarcomere to shorten? cross-bridge formation  calcium…

A: The component of a muscle fiber that contracts is called a sarcomere. Actin and myosin make up the…

Q: What happens to calcium ions when muscle contraction ends and relaxation begins? O The ions diffuse…

A: Muscle is one of the types of soft tissues present in human beings and many other animals, and these…

Q: What are the mechanisms for muscle contraction vs. relaxation in regards to myosin/thick…

A: The mechanism of contraction of skeleton muscle was based explain through "sliding filament theory"…

Q: The endplate potential decreases with distance because

A: The end plate potential is a potential that propagates to the neighbouring patch of muscle fibre…

Q: According to the sliding filament mechanism of skeletal muscle contraction, during contraction: The…

A: The myofibrils of skeletal muscles contain alternatingly dark and light bands. The dark band is…

Q: A muscle cell dies, so that there is no ATP left in the sarcoplasm.  However, there is lots of Ca2+…

A: Rigor mortis is the stiffening of a dead body after hours of death. The word translates into…

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: Neurons controlling skeletal muscle contraction are which type? Multipolar motor neurons Bipolar…

A: The neurons are classified into different categories on the basis of certain features. They can be…

Q: the process of muscle contraction, which of the following steps immediately precedes the influx of…

A: Muscle contraction:-  Is the response  a muscle has to any kind of stimuli where the result is…

Q: The contraction of skeletal muscle fibers is prevented by regulatory proteins located on the: O thin…

A: Muscle contraction is referred to as the tightening of the muscles present in the body of an…

Q: distance runners. All of tl igher concentration of gl

A: Elite sprinters make use of type II fibers more than other muscle fibers and are fast glycolytic…

Q: What happens as a result of the movement of tropomyosin? O Calcium is pumped into the sarcoplasmic…

A: The sliding filament theory is proposed to explain the mechanism lying in the contraction of…

Q: During muscle contraction, what does calcium bind to in skeletal muscles? Tropomyosin O Actin Myosin…

A: Skeletal muscles are one of the major type of muscle where it works under the voluntary control of…

Q: Muscle contraction involves a protein conformational change called the power stroke. Where…

A: Each myosin motor protein possesses ATPase activity and functions in a cyclical manner that couples…

Q: Please describe when the myosin heads grab and pull on the active sites in the actin fibers

A: Muscle cells are specific for contraction. It allows for motions and facilitates bodily processes…

Q: Sarcomeres that are very long at rest generate low amounts of tension because there is very little…

A: Sarcomere is defined a complex striated tissues that acts as the basic contractile unit of the…

Q: Release of calcium from the terminal cisternae Binding of acetylcholine to the acetylcholine…

A: Adenosine triphosphate is a natural compound and hydrotrope that gives energy to drive many cycles…

Q: Label the molecular components of the myofilaments from a close up view of a model of a relaxed…

A: Sarcomere: A sarcomere is the essential contractile unit of a muscle fiber. A sarcomere is made out…

Q: Why does a skeletal muscle cell generate the same amount of tension with each single stimulus? O…

A: Neural control initiates the formation of actin and myosin cross bridges, leading to the sarcomere…

Q: What is the best description of a contraction of the sarcomere Myosin pushes the actin fibers away…

A: Muscles are the tissue that are responsible for providing the movement to the body. It also…

Q: Muscle contraction incorrect order Calcium allows myosin to bind to the actin. A message travels…

A: Note:  the question is attempted to write the correct order of muscle contraction. Muscle is the…

Q: What causes rigor mortis? Choose all that apply.     Ca2+ leak out of the sarcoplasmic reticulum,…

A: When a person dies, the body undergoes gradual changes. The changes are: Rigor mortis - stiffening…

Q: Each of the pairs of phrases below describe steps during skeletal muscie contraction. The 2nd phrase…

A: Muscle tissue is a type of tissue which contain actin , Troponin and myosin proteins so as to allow…

Q: Once the calcium binds, what happens next? The myosin binding sites become available so myosin binds…

A: Muscles contract" in a sequence of binding and delivering amid the sarcomere's two thick and thin…

Q: Which statement or statements describe why depletion of ATP after death leads to rigor mortis?

A: Rigor mortis is the third phase of death. It is one of the unmistakable indications of death,…

Q: How does the cross-bridge result in thin filaments sliding over thick for contraction? Use key…

A: As Cross-bridge is formed myosin head is locked tightly on to an actin filament. Binding of ATP to…

Q: Which of the following is associated with smooth muscle contraction? Troponin as…

A: Muscle cells are specific for contraction. It allows for motions and facilitates bodily processes…

Q: Which of the following statements is true?     Fast glycolytic fibers have a small diameter.…

A: Fast glycolytic Fibers:  Fast glycolytic fibers, also known as type IIb fibers, are a type of muscle…

Q: Myosin's affinity for actin occurs Following the power stroke When myosin is energized When a new…

A: Myosin is a fibrous globulin of muscle. It split ATP and react with actin in muscle contraction.…

Q: A motor unit associated with the stimulation of skeletal muscle is designated as a 1:8 motor unit.…

A: A motor unit is made up of a motor neuron and the skeletal muscle fibres innervated by that motor…

Q: If Ca2+ pumps of the sarcoplasmic reticula fail to function, what will happen to the tension…

A: Muscle is a soft tissue like structure which is primarily responsible for the movement in the body.…

Q: Describe the structure of myosin molecules and how theycombine to form a myosin myofilament

A: The myofibrils are comprised of actin (thin filament) and myosin (thick filament). Muscle…

Q: What causes the myosin head to move into the 'cocked' position after it is released from actin?…

A: The contraction of muscle occurs due to the interaction of contractile proteins (thin actin and…

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.