An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about the calcium ion and muscle contractions is TRUE? Select one: a. Muscle contractions can occur whether Ca2+ concentrations are high or low.

Q: The mechanism of muscle contraction is best explained by the sliding filament model. According to…

A: Many different forms of cell motions are caused by actin filaments, which are often linked to…

Q: Select one or more: - a. No tension can be generated. b. Both contractile and elastic forces…

A: Stretching helps to keep our muscles flexible, strong, and healthy, and its very much needed for…

Q: The sliding filament mechanism describes the process during which: a. actin and myosin slide…

A: The muscles of the body serves main role in the movement of the body parts such as legs, arms and…

Q: When a skeletal muscle cell contracts and the muscle shortens,

A: During muscle contraction, some myosin heads bind to actin (forming crossbridges) while others…

Q: Which of the following statements about the Ca2+ release channels in the sarcoplasmic reticulum is…

A: The right answer is option b) They are one-tenth the size of the voltage-gated Ca 2+channels. The…

Q: Which of the following lists the structures from largest to smallest?a. motor unit, muscle,…

A: Muscle is a soft tissue found in many animals. Muscle cells contain protein fibers of actin and…

Q: A mutation has occurred that prevents ATP from binding from the heads of myosin. What impact would…

A: Mutation is defined as any sudden change in the nucleotide sequence of genes. It may also be defined…

Q: Cytokinetics is a Bay Area pharmaceutical company that has developed a drug called Tirasemtiv for…

A: Tirasemtiv is a drug developed by Cytokinetics. It  acts on skeletal muscle troponin and increases…

Q: Which of these events occurs during the lag (latent) phase of musclecontraction?a. cross-bridge…

A: Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of myosin and…

Q: The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so…

A: Skeletal muscles are a special type of muscles made up of contractile tissue. They are a type of…

Q: Which of the following are involved interaction of myosin and actin? A. interaction between the…

A: Actin and myosin are the microfilaments which are involved in contraction of muscles. The troponin…

Q: a. Individual organ a. myofibril b. An individual cel b. muscle c. A bundle of proteins c. fascicle…

A: Introduction: Skeletal muscles are voluntary muscles as their relaxation and contraction are under…

Q: Which of the following is true?   A. Muscle fibers either will contract with all the force…

A: Introduction: Muscles are the soft tissues present in all mammals. The muscle cells comprise protein…

Q: Considering the force of contraction of a skeletal muscle fiber,wave summation occurs because ofa.…

A: Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of myosin and…

Q: Muscle fibers contractions differ with regard to tension and shortening. When a muscle Fiber begins…

A: Isometric and isoconcentric

Q: The decrease in active force that occurs at lengths longer than the optimal length is caused by: O…

A: According to the question, the decrease in active force that occurs at lengths longer than the…

Q: The Ca2+ required for skeletal muscle contraction, O A. Is released from mitochondria B. Is released…

A: when the nerve impulse is activated that is action potential comes in  muscle contraction…

Q: What happens in a muscle twitch? a. Myosin grabs a thick myofilament. b. Sarcomeres shorten during…

A: Muscle twitches can occur for heaps of reasons like stress, an excess of caffeine, a horrible eating…

Q: The actin myosin bond is broken by the attachment of A. Tropomyosin B. Phosphate C. ATP D. ADP

A: Myosin and actin filaments are two types of proteins involved in muscle contraction. Myosin is a…

Q: Which of the following is the site of calcium ion storage within muscles? a. T tubules b.…

A: Muscles are the body tissues that are principally accountable for causing movement in the body.…

Q: The ability of a muscle to generate tension immediately after stimulation is dependent on: a. myosin…

A: Muscle contraction is the enactment of tension-creating sites inside muscle strands. In physiology,…

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

A: Calcium ions and actin binding proteins play an important role in muscle contraction and relaxation.…

Q: What might happen if skeletal muscle lacked tropomyosin?   A. The striation pattern would…

A: Myogenesis is the process of formation of muscles from the mesodermal layer of embryonic germ cells.…

Q: Put the following in order to accurately follow the sequence of events associated with muscle fiber…

A: Relaxing of muscle filaments starts with the motor neuron, which stop delivering its compound sign,…

Q: Which of the following statements correctly describes properties associated with the development of…

A: Skeletal muscle tissue's major function is to move the body by pushing on the skeleton's bones,…

Q: Myosin binds to actin, then bends. What is ATP needed for next? A. to pump the Ca++ “keys” back into…

A: D option is the correct statement.

Q: A study of muscle fibers between chimpanzees and humans revealed that although muscle mass per body…

A: Red muscles have slow-twitch fibers which can contract slowly for a long period of time without…

Q: The action potential of skeletal muscle                 A. is not essential for contraction.…

A: Skeletal muscle fibers are cylindrical, multinucleated, striated, and under voluntary control.

Q: When ADP and Pi are bound to myosin in the cross-bridge cycle... (MULTIPLE SELECT) A. There is no…

A: The cross-bridge cycle of muscle contraction is the process in which the actin filament and myosin…

Q: Rigor mortis occurs following death because a. tropomyosin remains over the myosin binding sites of…

A: Introduction: Rigor mortis helps in assessing the time since death to determine if the body had been…

Q: Muscle contractions where the muscle shortens but tension remains constant are called A. isometric…

A: Muscular system is a type of body system in which regular contraction as well as relaxation leads to…

Q: During muscle contraction, binding sites for myosin are uncovered by the movement of A. Tropomysin…

A: A. Tropomyosin   During muscle contraction, the binding sites for myosin on the actin filament are…

Q: Describe what is happening to the following parts of a sarcomere during muscle contraction. a. H…

A: H band or H-zone is the central region of the A zone. H zone only contains thick filaments i.e.…

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: Which of these statements concerning aging and skeletal muscle iscorrect?a. A loss of muscle fibers…

A: Skeletal muscles are attached to bones and long, cylindrical, striated fibers with many peripherally…

Q: What causes relaxation in a skeletal muscle fiber Select one: a. Myosin remains attached to actin b.…

A: Each skeletal muscle is an organ that consists of various integrated tissues. These tissues include…

Q: What do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types…

A: The skeletal muscles are a form of striated muscle under voluntary control of the somatic nervous…

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.