Within the first few seconds of a 5-minute race, stored ATP isdepleted. How do muscles obtain energy for the rest of the race?a. High-energy phosphates are transferred from glycogen to ADP.b. Creatine phosphate restores the ATP supply at first; then aerobicrespiration generates ATP as long as O2 is available.c. Actin filaments donate the high-energy phosphates that myosinfilaments require.d. Fermentation begins producing new ATP as soon as stored ATP isdepleted.

Q: Contrast the role of Ca2+in the contraction of a skeletalmuscle fiber and a smooth muscle cell.

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

Q: Compare the composition of flight muscles with a powerful locomotive muscle in terms of…

A: Flight muscles are a type of muscle which is found in birds or insects. This muscle helps birds or…

Q: Predict the effect of excess calcium ions in the extracellular fluid on a smooth muscle…

A: Muscle contraction is the result of the interaction between these two proteins, actin (spherical)…

Q: In tonic smooth muscle that contracts continuously for long periods, the highly efficient "latch…

A: Smooth muscles are unstriated and involuntary muscles. They are present in viscera such as GIT,…

Q: For the skeletal muscle, hydrolyzation of ATP: Group of answer choices At the myosin head gives rise…

A: The contractile proteins that are involved in muscle contraction are myosin and actin. The two…

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: Name the system that provides a ready supply of phosphocreatine to muscle cells and describe where…

A: Phosphocreatine It is also known as creatine phosphate. It is a phosphorylated form of creatine…

Q: What is the first and most direct energy source for muscle con￾traction? a. glucose b. ATP c.…

A: Answer- The muscle contraction is the crutial step in the movement and locomotion.

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: Summation in a single muscle fibre means that Select one: a. the fibre increases the frequency of…

A: Introduction Muscle contraction:- It is the activation of tension-generating sites within muscle…

Q: Under what conditions will lactic acid accumulate in skeletal muscle? Select one: A. When NADH is…

A: A reduction in muscle force generated over time or as a result of pathological conditions is…

Q: Explain the relation between muscles, ATP energy, and the calcium ion.?

A: Muscle consists of muscle fibres/cells , made up of myofibrils containing myofilaments , actin and…

Q: The release of which of the following minerals from muscle cell storage sites stimulates muscle…

A: Sarcoma muscles store calcium in sarcoplasmic reticulum. It gets released when a muscle cell or…

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: uscle action, which of the following represents the correct sequence of events? 1. Action potential…

A: The correct Answer is B  That is 1-5-2-3-4

Q: What is released when myosin heads attach to actin filaments A. Phosphate B. ATP C. ADP D.…

A: Myosin and actin filaments are two proteins that help muscles contract. Myosin is a motor protein…

Q: During muscle contraction, some energy is supplied from creatine phosphate. Which of the following…

A: Muscle contraction occurs when tension-generating sites within muscle cells are activated.

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: During which phase of the crossbridge cycle is ATP split into ADP and Pi? A. Immediately preceding…

A: Cross bridge cycling refers specifically to the action of the cross-bridge, that being the head and…

Q: During which phase of a twitch in a muscle fiber istension the greatest?a. resting phaseb.…

A: The phenomenon of lifting or moving an object (load) involves the sarcomeres present in the muscle…

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: Choose the best description of how myosin and actin are arranged within the two types of protein…

A: In order to facilitate movement, muscles are attached to bones. They function by shortening…

Q: Identtidy which among the list represents the hierarchy of muscle structure from the largest unit to…

A: Muscles are connected to bones by means of tendons. They contract to produce movement and thus help…

Q: Chickens are capable of only brief bursts of flight, and their flying muscles consist of fast…

A: Introduction: Wings of birds are responsible for giving them flight. They possess feathers and the…

Q: Describe how glycolysis, creatine, and mitochondria are important to a skeletal muscles fiber's…

A: ATP provides the energy required for muscular contraction. In addition to its direct role in the…

Q: Find the false statement about white muscle fibers (glycolytic fibers)? Se ect one: a. Fiber…

A: Depending upon the presence or absence of myoglobin muscle fibres can be of two types that is ref…

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: 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: Describe the contraction of a muscle fiber, starting with what events take place at the…

A: Introduction: Muscle is a mesodermal contractile connective tissue. Muscles contain unique…

Q: Where is ATP's energy used during crossbridge cycling? A. When ATP attaches to myosin and causes…

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

Q: Which statement about the diagram is not correct??  A. The diagram enlarged one myofibril B. This…

A: The muscle fibers are multi-nucleated (exclusively in the case of skeletal muscle fibers),…

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: Muscles need energy to function properly. Identify a minimum of two pathways generating ATP during…

A: Muscle contraction is a complex process. It occurs when the thin actin and thick myosin filaments…

Q: Predict and explain the response if the ATP concentration in a musclethat was exhibiting rigor…

A: Rigor mortis is a recognizable sign of death, which is characterized by stiffening of the limbs…

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: After the power-stroke, the myosin heads must bind ______ in order to release actin. The muscles…

A: Muscle cells are highly specialized for a single task, contraction, and it is this specialization in…

Q: During muscle contraction, the ion that leaks out of the sarcoplasmic reticulum and induces…

A: Ions of calcium diffuse through muscle fibres. The contraction occurs as the relationship between…

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: During vigorous effort in muscle cells, ATP stores are quickly depleted. However, creatine phosphate…

A: Given that, During vigorous effort in muscle cells, ATP stores are quickly depleted. However,…

Q: What happens when myosin filaments hydrolyze ATP molecules in muscles?    a. Actin–myosin complexes…

A: The specialised cytoplasm of a muscle fiber is called sarcoplasm which contain fine thread like…

Q: the statements that are true about the structures in the image:

A: Q1. The true statements are:1. The sarcolemma is the specialized plasma membrane of a muscle cell.2.…

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.