Arrange the steps in the correct order to explain how a muscle fiber contracts.   Myosin and actin protein filaments attach to each other.   Calcium ions release into the myofibrils.   Myosin filaments pull on the actin filaments.   The nerve impulse reaches the neuromuscular junction.   The motor neuron carries the nerve impulse.   The sarcomere shortens.

Q: Which of the following summarizes the role of acetylcholinesterase in muscle contraction? O opens…

A: Acetylcholinesterase (AChE) is an enzyme that breaks down the neurotransmitter acetylcholine in the…

Q: which decreases cytoplasmic calcium ion concentration The relaxation of skeletal muscle relies on…

A:

Q: The Sarcolemma in skeletal muscle is OA. Equivalent to the cell membrane which covers the entire…

A: There is muscle tissue throughout the body. The muscles affixed to the skeletal system are referred…

Q: Which of the following is NOT true regarding actin? O It contains troponin and tropomyosin O It is a…

A: Among the given options, option (d) is the most appropriate. All the mentioned statements are true…

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: The power stroke in muscle contraction is the: Group of answer choices product of force and velocity…

A: The cells that make up muscle have the unique capacity to shorten or contract to cause movement of…

Q: A nerve fiber,together with all of the muscle fibers it innervates, is called amotor unit. A motor…

A: The plasma membrane of a neuron can change its potential from a resting potential to an action…

Q: Why is it better that our muscles perform unfused tetanic contractions rather than single twitches…

A: Introduction: Muscle contraction is required for daily activities as well as for movements. Muscles…

Q: of his parent's house over the weekend. On Monday, he arrived at the clinic ainful back spasms. He…

A: A back spasm is involuntary tensing or contraction of the muscle in lower back. This condition…

Q: Why does a skeletal muscle fibers always produce the same amount of tension with a single stimulus?…

A: Muscle is a delicate tissue found in many creatures. Muscle cells contain protein fibers of actin…

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 is the function of calcium in muscle contractions? to bind to troponin and change its…

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

Q: Which of the following correctly states the importance of an action potential to muscle contration?…

A: Muscle contraction helps in the movement of muscles. It causes the muscle fibers to contract to…

Q: During sarcomere contraction, Select one: Oa. Calcium, troponin Ob. Calcium, microfilaments O c.…

A: The answer is option A- calcium, troponin

Q: Which of the following is in the correct order of largest to smallest O Muscle, bundle of…

A: The muscular system is a part of the cytoskeletal system, which is responsible for the movements…

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: When a(n) __________ moves along the sarcolemma, the membrane potential changes along the membrane…

A: The sarcolemma is the cell membrane of the muscle cells. When a muscle is stimulated by a neuron at…

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: Which one of the following statements is the best description of a motor unit?     A single…

A: Motor unit is defined as a single motor neuron and all of the muscle fibers it innervates.

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: 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: What are the positions ofactin and myosin molecules inthe sarcomere before andduring the…

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

Q: The Terminal Cisternae are: OA. The basic contractile unit in skeletal muscle O B. Equivalent to the…

A: Terminal cisternae In anatomy, these are defined as the areas that are present in the muscle cells…

Q: Which ion starts the muscular contraction by binding to myofilaments? Potassium Chloride Calcium…

A: The muscular system whose origin can be traced to the middle germ layeris responsible for the…

Q: Describe the sequence of events involved in myosincross-bridge attachment and detachment. Relate…

A: In physiology, myosin is defined as the protein that binds and attach with actin protein on the…

Q: In which of the following locations would you most likely find the tissue known as perimysium?…

A: Skeletal muscle is responsible for movement of various parts of the body and locomotion. These…

Q: When compared to normal muscle, the response of the denervated muscle to electrical stimulation…

A: Normal muscle fibers appear polygonal in shape whereas denervated muscle appears angular and…

Q: Skeletal muscle cells have the ability to do all of the following EXCEPT _____.     activating…

A: Skeletal muscle is a type of three major muscle types, the others being cardiac muscle and smooth…

Q: Which of the following statements are true? (choose all that apply) The Z-disc is found in the…

A: The unit of the muscle is known as sarcomere that shows massive molecular events during muscle…

Q: Diagram a sarcomere, showing the basic organization ofthin (actin) and thick (myosin) filaments.…

A: Sarcomere- A unit of tissue of striated muscle is called a sarcomere. It is the area falling between…

Q: The disease poliomyelitis (po′le-o-mi′˘e-li′tis) destroys motor neurons, causingloss of muscle…

A: Poliomyelitis is caused by a virus that may cause paralysis in the person. Poliomyelitis can be…

Q: Which of the following would NOT occur as a result of regular exercise to a specific muscle group…

A: The exercising involves the training of muscles by putting heavy load on them, due to exercising the…

Q: As an action potential moves along the sarcolemma, the brief opening of voltage-gated Na+ channels…

A: In the resting state, the inside i.e., sarcoplasm contains high concentration of K+ ions and…

Q: Which of the following regions of a sarcomere does not change length during a contraction because it…

A: Skeletal muscles are voluntary muscles. The contraction and relaxation in the skeletal muscle enable…

Q: Question: According to the sliding filament model of contraction, the components of the sarcomere…

A: Given To find the components of sacromere that shorten when muscles contract.

Q: The diagram below represents the terminal cisterna in a muscle. Name and briefly explainthe function…

A: Nerve Impulse: It all starts with a nerve impulse reaching the neuromuscular junction, where a motor…

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: The cell membrane of a muscle fiber is called________.a. myofibrilb. sarcolemmac. sarcoplasmd.…

A: Muscle is a soft tissue which is found in most animals. They are helpful in providing movement and…

Q: Why does continuous calcium release within a muscle fiber cause greater tension? O Activates more…

A: Maximal tension in muscle happens when thick and thin fibers crossover greater extent inside a…

Q: The functional unit of a muscle fiber is the, a segment from one Z disc to thenext.a. myofibrilb. I…

A: Z-discs (Z-disk, Z-line, Z-band) are the smallest functional units in striated muscle, defining the…

Q: Now in your own words, EXPLAIN (1) howa neural impulse is transferred to a muscle cell this is the…

A: Neural impulse or a nerve impulse refers to a signal that is transferred along the nerve fiber. It…

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.