What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation? a. stimulation of ACh receptors b. diffusion of Na+ back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking of the bond with tropomyosin

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: Muscle relaxation occurs when ________. a. calcium ions are actively transported out of the…

A: The human body is a well built machine in which all the organs coordinate together to make it work.…

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

A: Actin-binding proteins and calcium ions play an important role in muscle contraction and relaxation.

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: During evolution, skeletal muscle became adapted to functional de-mands ranging from sudden,…

A: The skeletal muscles of vertebrates are composed of different types of fibers. This includes slow…

Q: Unlike skeletal muscle cells, cardiac muscle cells________."   A do not use the sliding filament…

A: Muscle is a soft tissue present in various animals.Muscle cells are composed of protein filaments of…

Q: During a concentric contraction of a skeletal muscle fiber, myofibrils a. lengthen. b. remain the…

A: Muscle fibers are composed of myofibrils. The myofibrils are made up of myosin and actin filaments…

Q: An energy storage compound that can be stockpiled in muscle cells for short-term use is (a)…

A: Creatine phosphate - is an energy storage compound that can be stock piled in muscle cells for short…

Q: Through which ATP-generating mechanism can long-lasting muscle contractions be sustained? a.…

A: Introduction :- Muscle contractions are defined by changes in the length of the muscle during…

Q: Which of the following statements is True?a. Tendons contract using the sliding filament…

A: The muscular-skeletal system made up of tendons, ligaments, bones, muscles of various types. The…

Q: How is electrical excitation of a skeletal muscle fiber coupled to muscle contraction? Speculate…

A: Acetylcholine is released by motor neurons which binds to receptors in the motor endplate. A neural…

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: During contraction, where does the calcium that binds to troponin come from

A: Muscles are made up of two main protein filaments namely, a thick filament that is made up of a…

Q: What effect does physostigmine have on smooth muscle contraction? a) no effect on the smooth muscle…

A: Hi, Thanks For Your Question.  Answer : Correct Option Is C (stimulates smooth muscle contraction).

Q: A skeletal muscle can be stimulated, under laboratory conditions, with a supramaximal stimulus. Is…

A: As the nervous system produces electrical stimuli called an action potential, it passes through a…

Q: What effect does increasing the frequency of action potentials in askeletal muscle fiber have upon…

A: With alternative arrangements of light and dark band, skeletal muscles are striated muscles. They…

Q: After a vigorous exercise, you may experience cramps in your leg muscles. Why does this happen?

A: Exercise is any bodily activity that enhances or maintains physical fitness and overall health and…

Q: In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules.…

A: Calcium triggers contraction by reaction with regulatory proteins that in the absence of calcium…

Q: •What is the role of tropomyosin in muscle contraction?

A: Tropomyosin prevent myosin from continuing to slide up the actin filament.

Q: Define The myosin superfamily in humans.

A: A cell is the basic structural and functional key of life. A cell has multiple organelles that carry…

Q: Which of the following is false regarding smooth muscle? A. It contracts slower than skeletal…

A: There are three types of muscles skeletal, cardiac and smooth muscles.

Q: As skeletal muscle shortens with contraction, the length of the I band remains constant as the…

A: Muscle contraction is defined as the process of stimulation of tension generation sites present…

Q: The series-elastic component of muscle contraction is responsible for a.increased muscle shortening…

A: Muscle is a delicate tissue found in many creatures, and is one of the four fundamental creature…

Q: Explain how the length of a muscle fiber at the time it is stimulated to contract affects the…

A: Introduction:- The functional unit of striated muscle is the sarcomere. This is the most fundamental…

Q: Where does Ca2+ for contraction come from

A: Epithelial tissue, connective tissue, muscular tissue, and nerve tissue are the four fundamental…

Q: structural organization of muscle fibers makes it possible to produce contractile force

A: Answer: Sarcomere of Muscles fibre or myofibre is the basic contractile unit of skeletal muscle.

Q: Select the best answer or answers from the choices given: The function of the T tubules in muscle…

A: Muscle contraction can be defined as the process in which the length of the muscles decreases and…

Q: All of the following characteristics apply to skeletal muscle except

A: Option (d) is right answer.  Because they do not contain intercalated discs.

Q: In relation to the size principle of motor unit recruitment, the mechanism of recruitment f) order…

A: The process of activating different motor units to achieve a specific level and kind of muscular…

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: 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: How would muscle contractions be affected if skeletalmuscle fibers did not have T-tubules?

A: Muscles:                    In animals, soft tissues found known as muscles. Muscles cells contain…

Q: A.What type of contractions do skeletal muscles do? B. What type of contractions do cardiac muscles…

A: Muscles are usually of three types that is Skeletal,smooth and cardiac  Skeletal muscles are found…

Q: - The sacromere is: a- A functional unit of the skeletal muscle b- The area between two intercalated…

A: Muscle cells, commonly known as myocytes, are the cells that makeup muscle tissue. There are three…

Q: The excess ATPs are stored in muscles as CPs? A. True B. False

A: Adenosine triphosphate (ATP) is a three-phosphate nucleotide. The addition of phosphorous to the…

Q: Which is true for striated muscles? a) may have spontaneous activity b) is not under the control…

A: Muscle are group of cells which perfom a specific function. They are responsible for movement. They…

Q: When a muscle fiber is stimulated with repeated stimuli, the contraction force is summed due to: a)…

A: INTRODUCTION Summation is that the . occurrence of additional twitch contractions before the…

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: Based on what you know about the neuromuscular junction and muscle contraction, describe very…

A: The neuromuscular junction is The portion at which the neuron axon terminal meets the skeletal…

Q: Explain why myosin II in a sarcomere can produced force only for that sarcomere contraction and not…

A: SARCOMERE   It is the basic structural and functional unit of muscle tissue. COMPONENTS: Each…

Q: What effect does increasing the frequency of action potentials in a skeletal-muscle fiber have upon…

A: Skeletal muscles -- are the muscle which are in our voulantry control These  are attached to the…

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

A: Calcium causes contraction by reacting with regulatory proteins that prevent actin and myosin from…

Q: a) Describe how the isolated muscle behaved as it was stretched progressively. b) What effect…

A: The all-or-none principle asserts that the intensity of a nerve cell's or muscle fiber's reaction is…

Q: Predict the effect of the following on muscle contraction: A. Bitten by a black widow B. Curare C.…

A: Muscle contraction refers to the generation of tension at specific sites in the muscle fibers. It…

Q: Outline the role of calcium ions on muscle contraction during a biceps curl. In your answer: A)…

A: The muscle cells possess electrical excitability and contraction properties. Their contraction…

Q: What structure invaginates into the middle of the muscle cell to transport Ca2+ into the middle of…

A: Muscle contraction is a process in which the actin and myosin filaments slide past each other.…

Q: What would happen to muscle function if you ingested a toxin that completely inactivated troponin?…

A: The three types of muscle present in the body are skeletal muscle, smooth muscle and Cardiac muscle.…

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.