During muscle contraction, the cross-bridge detaches when ________.a. the myosin head binds to an ADP moleculeb. the myosin head binds to an ATP moleculec. calcium ions bind to troponind. calcium ions bind to actin

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: During the contraction of a vertebrate skeletal muscle fiber,calcium ions(A) break cross-bridges as…

A: Skeletal muscles are voluntary muscles. It attached to bone by tendons. It helps in movement of…

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 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: f a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative…

A: T tubules or the transverse tubules are the extensions of the cell membrane that penetrate into the…

Q: Which of the following statements best describes the sliding filament mechanism of muscle…

A: Actin- It is the main component of thin filament in muscle fibre, cytoskletal protein. Myosin-motor…

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: figure below, the first action considered: First Action Last Action A an O Strong contraction Fast…

A: Electromyography is the diagnostic procedure that allows assessing the health of muscles and nerve…

Q: What happens to sarcomeres when actin and myosin filaments in a muscle fiber interact during the…

A: Answer - According to the question option B is correct which says : -  sarcomeres usually get…

Q: During muscle isometric tension, the maximum tension occurs when: O a. There is no overlapping…

A: Isometric contraction occurs when muscle length remains relatively constant as tension is produced.…

Q: What causes a muscle cell to contract? A) ATP forms a bridge binding actin to myosin. B) Calcium…

A: The muscular system is made up of muscle tissue and is responsible for functions such as maintenance…

Q: Nervous stimulation of musclesa. occurs at a neuromuscular junction.b. results in an action…

A: Answer is d.)  All of these Correct.

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: Single-unit smooth muscle cells can stimulate each other because they havea. a latch-bridge.b.…

A: The myocyte is also known as a muscle cell or the type of cell found in some types of muscle tissue.…

Q: What are some adaptations/specializations that we see in skeletal muscle fibers that increase their…

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

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

A: In muscles the sarcomer is termed as the fundamental unit. The sarcomer helps in the contraction.…

Q: Cardiac muscles differ from skeletal muscles in thatthey ________.a. are striatedb. utilize aerobic…

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

Q: The function of ATP during muscle contraction is toa. cause an allosteric change in myosin so it…

A: ATP(adenosine triphosphate) causes an allosteric change on myosin so it detaches from actin and…

Q: The muscles of a professional sprinter are most likely to have ________.a. 80 percent fast-twitch…

A: Skeletal muscles can be grouped into fast and slow fibers based on how quickly they can contract and…

Q: In order to excite a skeletal muscle, the neurotransmitter must bind to: a)calcium channels. b)…

A: Neurotransmitters such as acetylcholine bind to receptors on the muscle surface and elicit a…

Q: When sarcomeres contract during muscle contraction, which of the following occurs?   A. The myosin…

A: Sarcomeres contract during muscle contraction.

Q: 2 T tubule 3. ATP 4. lateral sacs of the sarcoplasmic (c) supplies energy for the reticulum 5.…

A: Muscle contraction begins when the impulse arrives at a particular muscle which is going to be…

Q: In a contractile unit of muscle, "thin" filaments are composed of А. O A. calcium. O B. actin. OC.…

A: Muscle contraction leads to shorting the length of muscle. Muscle contraction implies that movement…

Q: Which muscle filament in skeletal muscle contains the calcium-binding protein? O Thick O Sarcomere O…

A: Skeletal muscles play a huge role in the way our bodies function because, without muscles, our bones…

Q: During muscle contraction, the I band a. hides the H zone. b. shortens or narrows. c. overlaps the Z…

A: SARCOMERE It is the complicated unit of striated muscle tissue. It is the repeating unit between two…

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: Repetitive stimulation of a skeletal muscle fiber will cause an increase in contractile strength…

A: Muscles are tissues which helps in locomotion and motion . There are different types of muscles in…

Q: Type I of muscle fibers are utilize both oxidative metabolism O and anaerobic glycolysis O utilize…

A: The three types of muscle fibres are slow oxidative (SO), fast oxidative (FO) and fast glycolytic…

Q: What type of muscle fibers would you expect to find in the leg muscles of a well-trained marathon…

A: Correct answers : d) Fibers with many mitochondria   It is the correct answer because a well…

Q: The release of calcium ions initiates muscle contractions.Watch this video…

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

Q: Which protein has binding sites that the myofilament "head" is able to attach to? Select one: a.…

A: Answer1- d. actin When muscle contracts, the globular heads of the thick myosin filaments attach to…

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: In smooth muscle fibers, the thin filaments attach to structures called functionally similar to Z…

A: Muscular tissue is made up of long cells of muscle fibers. It has contractile proteins that are…

Q: Contraction of muscle fibers in skeletal muscle is initiated by the uptake of calcium by the…

A: Movement refers to any change in body position. It is a fundamental characteristic of living beings.…

Q: a. Ca2+ does not affect muscle force. b. The muscle cell eventually habituates to the level of Ca2+…

A: Structure of muscle cell A muscle cell consists of hundreds of fibers. A single fiber consists of…

Q: Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium,…

A: Within the muscle cell the actin and myosin interaction occurs. The acting is a cytoskeleton protein…

Q: A bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle.…

A: (c) the ability to stimulate the muscle is impaired

Q: The transverse tubules store and release calcium ions (Ca<") in response to an action potential in a…

A: The transverse tubules are formed by phospholipid bilayer and play a significant role in 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…

Q: For the myosin head to form cross bridges with actin, it is necessary for to bind to actin. a)…

A: When calcium atoms bind to the globular molecules like my os in protein, they change shape and this…

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 muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous…

A: The force exerted by the muscle is less than its maximum in a concentric contraction, and the muscle…

Q: The muscle cell membrane of the neuromuscular junction is called the A. Synaptic cleft B. Motor end…

A: Introduction The neuromuscular junction (NMJ) is a highly specialised synapse that connects a motor…

Q: In an isometric contraction, the muscle develops tension but does not: a.  Expend energy. b.…

A:

Q: Unlike in adult rats, muscle fibers in newborn rats Select one: O a. Removing a limb bud O b.…

A: Muscle fibres are made up of only one muscle cell. They assist in the management of the body's…

Q: In the presence of myosin cross-bridges are able to bind to complementary sites on the actin…

A: Every skeletal muscle is composed of my 5 deals full stop this my fibrils are composed of my…

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: If acetylcholine re-uptake is blocked in the synaptic cleft, then what happens in the muscle cell?…

A: "Muscle contraction" is responsible for every movement in our bodies and may be found in every…

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.