Q: What is a muscle fiber? How is it formed?
A: A single muscle cell is present in the muscle fibre. The physical forces within the body are…
Q: What is Skeletal Muscle Energy Metabolism?
A: Muscle is a soft tissue present in most animals. Muscle cells consist of protein filaments of myosin…
Q: What would happen if ATP suddenly were not available after the sarcomere had started to shorten?
A: The muscular framework is an organ framework comprising of skeletal, smooth and cardiac muscles. It…
Q: What are the detailed structures of the skeletal muscle tissue? Including Fascicles to Myofibrils…
A: Skeletal muscle is an organ of the muscular system and it is one of the chief muscle types in the…
Q: What is the role of stored creatine phosphate in muscles?
A: The human body consists of various systems that function together to carry out their daily…
Q: characteristics of fatigued muscle?
A: The reduction in the force-generating ability of the muscles is known as muscle fatigue. It can…
Q: What is migrating myoelectrical complex (MMC)?
A: At fasten time, The contraction of muscle in stomach and in small intestine to clean the residual of…
Q: List the types of Skeletal Muscle Fibers?
A: Muscles are one of the four main types of tissues present in the human body.
Q: What happens when theoxygen supply is insufficientto maintain aerobic cellularrespiration during…
A: Cellular respiration is a combination of metabolic reactions that occurs in the cells of organisms.…
Q: What is muscle fatigue?
A: Tissue is the next level organization of the cells. There are 4 different types of tissue are…
Q: How do calcium ionsparticipate in musclecontraction? Why do bothmuscle contraction andmuscle…
A: Muscle contraction is the process of activating tension generating sites in the muscle fibers.…
Q: What are the function of muscle fibre?
A: Muscle is a widely occurring soft tissue in most animals. Muscle cells contain actin and myosin…
Q: What is the major fuel for muscle under strenuous work conditions?
A: Carbohydrates, such as sugar and starch, are quickly broken down into glucose, which is the body’s…
Q: Why take magnesium when cramping a muscle
A: A muscle cramp is an involuntarily and forcibly contracted muscle that does not relax. These are…
Q: What is the normal end product of anaerobic exercise in muscle?
A: An anaerobic exercise is a form of exercise that uses no oxygen to break down glucose in the body.…
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 Energy for Muscle Contraction ?
A: There is a source of energy which is used fir muscle contraction and it’s movement.
Q: How does phosphocreatineact in the muscle contractionand relaxation?
A: Introduction Locomotion is the key to animals as they are motile and can move from one place to…
Q: Why is the muscle glycogen higher than normal?
A: Glycogen is considered as the complex form of the carbohydrate, which acts as an energy source.…
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: What type of exercise would most benefit from creatine supplementation?
A: Introduction: Creatine is mainly present in skeletal muscles and is obtained from the diet as well…
Q: What is the site of calcium activity in skeletal muscle, smooth muscle?
A: Skeletal muscle is one of three major muscle types, the other being smooth muscle. It is a form of…
Q: how does The reabsorption of calcium ions into the sarcoplasmic reticulum by active transport…
A: Calcium ion channels triggers the contraction through the reactions of regulatory proteins and these…
Q: What are the five primary functions of skeletal muscle?
A: Muscle is a soft tissue in the body which primarily functions as source of power. Muscles cells…
Q: What are two separate steps or phases of muscle contraction that rely on calcium for proper…
A: Muscle contraction is the tightening and shortening of the muscle. Muscle contraction is an increase…
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: Why calcium is important in skeletal muscle contraction?
A: All muscle filaments use Calcium ion (Ca2+) as their fundamental regulatory and signalling molecule.…
Q: Where would you expect to find the greatest concentration of calcium in resting skeletal muscle ?
A: The human and other vertebrates contain three important muscle types, such as skeletal muscle,…
Q: If calcium cannot be returned to the SR quickly after a muscle contraction, how would this affect…
A: The cardiovascular system is sometimes called a blood-vascular system. In sustaining homeostasis,…
Q: What aspect of creatine phosphate allows it to supply energy to muscles?
A: Creatinine phosphate is a phosphorylated creatinine molecule that acts as a fast release reserve of…
Q: How would muscle contractions be affected if ATP wascompletely depleted in a muscle fiber?
A: Myofibril is also referred to as muscle fibril. They are the rod-like constitutions of the muscle…
Q: why does a rapid series of muscle twitches yield a stronger overall contraction than a single…
A: Muscle contraction that results from a single action potential is called a twitch. When there is a…
Q: Why is it in the muscle’s best interest to export lactic acid into the blood during intense…
A: Lactic acid, also known as lactate, is a chemical byproduct of anaerobic respiration, which is…
Q: Draw the structure of skeletal muscle tissue?
A: Skeletal muscle is an excitable, contractile tissue responsible for maintaining posture and moving…
Q: what the Source of energy of actin, myosin and type II muscle fibers?
A: Actin and myosin are two types of proteins that form contractile filaments in muscle cells. Type II…
Q: How do actin and myosin interact in a sarcomere to bring about muscle contraction? What roles do ATP…
A: Muscle contraction is the contraction of contractile units of muscle fiber or sarcomere, in response…
Q: Muscle response to a change in frequency or strength in muscular contractions?
A: The force generated by the contraction of the muscle is known as muscle tension.
Q: How do muscles respond to exercise and atrophy?
A: When a person exercises systems like- The cardiovascular, The respiratory, and muscular systems all…
Q: What are the five major functions of skeletal muscle?
A: The muscle is the tissue of the body that works as a wellspring of force. The impulse from nerve…
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- Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the aboveFigure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
- You are training athletes for the 100-meter dash. They need muscles specialized for speed and strength, not endurance. What muscle characteristics would your training regimen aim to develop? How would you alter it to train a long-distance swimmer?After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are “T-tubules� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
- Which of the following is associated with smooth muscle contraction? Troponin as calcium-sensing protein. Contraction based on the sliding filaments theory. Calcium-induced calcium release mechanism. Electromechanical calcium release mechanism. Contraction requires myosin light-chain kinase activityMuscle contraction can occur when: is it 1,2,3,4? A bands lengthen. myosin filaments shorten. sarcomeres shorten. I bands remain unchangedHow is the list below to be properly put in order to describe a muscular contraction? 1. Calcium causes exocytotic release of Acetylcholine into the synaptic gap; all this happens at an area called the neuromuscular junction2. ATP is consumed which allows myosin to "pivot" the myosin head, which pulls actin toward it.3. This process is repeated multiple times and is called the "sliding filament theory".4. Myosin filaments perform "crossbridging".5. Calcium is released and circulated throughout the muscle cell6. The brain predicts the action necessary and decides which muscles and how many "motor units" are needed to perform that action.7. Tropomyosin moves to reveal the active site of the F-Actin strand8. Upon reception of a calcium ion, the Troponin complex becomes activated9. Proteins embedded in the Sarcolemma receive enough of the ACH neurotransmitter to generate an electrical impulse.10. The electrical impulse is perpetuated throughout the muscle fiber.11. A nervouse impulse is…
- Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads b) Calcium release, binding sites on actin are exposedmyosin binds to actin c) Myosin binds to actin, myosin uses calcium, cell gets shorter d) Action potential is received , cell gets shorter, myosin grabs actinHow is muscle contraction stopped? Which of the following is/are correct? A) The brain stops sending the nerve impulse that commands the muscle to contract, interrupting communication at the neuromuscular junction B) Acetylcholineesterase (AChE) is released into the synaptic cleft to destroy any remaining Acetylcholine C) No mechanism is necessary. When the antagonist begins to contract, it forces relaxation and stretch of the agonist muscle. D) Relaxation occurs as the myosin heads are "snapped" off of the thick filaments. This interrupts the crossbridge and allows for muscles to stretch E) Relaxation only occurs if the brain sends a "stop" signal to the muscleWhat is the role of calcium in muscle contractions? Multiple Choice a) To spread the action potential through the T-tubules b) To bind with troponin, changing its shape so that binding sites on the actin filament are exposed c) To transmit the action potential across the neuromuscular junction d) To re-establish the polarization of the plasma's membrane following an action potential e) To break the cross-bridges as a cofactor in the hydrolysis of ATP