Which of these statements about the molecular structure of myofilaments is true?a. Tropomyosin has a binding site for Ca2+.b. The head of the myosin molecule binds to an active site on G actin.c. ATPase is found on troponin.d. Troponin binds to the rodlike portion of myosin.e. Actin molecules have a hingelike portion, which bends and straightensduring contraction.

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: A typical relaxed sarcomere is about 2.3 um in length and contracts to about 2 um in length. Within…

A: a) To find: The overlap of thick and thin filaments in the relaxed and contracted sarcomere

Q: A typical relaxed sarcomere is about 2.3 μm in length and contracts to about2 μm in length. Within…

A: The muscles fibers are composed of myofibrils and in turn myofibrils are composed of myosin and…

Q: How fast could a non-muscle cell make a contraction compared to a muscle cell if the relative rates…

A: In muscle contraction, actin filaments are associated with myosin filaments to perform various kinds…

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: Why is the latent period longer during an isotonic twitch of a skeletalmuscle fiber than it is…

A: Muscle tissue is a well-vascularized soft tissue present in the muscles of an animal body. Muscle…

Q: Motor neurons innervate muscle fibers at specialized synapses called_______ . The release of…

A: In “motor neurons”, the cell bodies are located in the spinal cord, motor cortex, or brainstem. The…

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: The______ is the basic unit of contraction. a. osteoblast c. myofibril b. sarcomere d. myosin…

A: Contraction is the property of muscles that helps in the movement of bones for locomotion. The…

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 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: What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation?…

A: Muscle contraction is the activation and formation of tension sites with muscle fibres, while muscle…

Q: For relaxation to occur, A. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium…

A: The muscle contraction and relaxation are regulated by the concentration of calcium ions released…

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 decrease in active force that occurs at lengths longer than the optimal length is caused by: O…

A: According to the question, the decrease in active force that occurs at lengths longer than the…

Q: A muscle fiber is the same thing as a: a) myofibril. b) myocyte. c) myofilament. d) fascicle.

A: MUSCULAR TISSUE:- These tissues are different from other tissues as they have the ability to…

Q: 1. During skeletal muscle contraction, what event directly precedes the release of actin by myosin?…

A: It is required to mention the event that directly precedes the release of actin by myosin during the…

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.…

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Q: What might happen if skeletal muscle lacked tropomyosin?   A. The striation pattern would…

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Q: Describe the structure of myosin molecules and how theycombine to form a myosin myofilament

A: The myofibrils are comprised of actin (thin filament) and myosin (thick filament). Muscle…

Q: Myosin are motor proteins that drive forces and movement on actin filaments.

A: Answer:  MYOSIN = These are the proteins , found in muscle cells and primarily plays a major role in…

Q: With regard to muscle contraction, which of the following is an INCORRECT statement with regard to…

A: The muscle cells contain a striped pattern or striations which is formed by a series of basic units…

Q: During the cross-bridge in muscle cells, myosin motors hydrolyzes ATP as a fuel to create a pulling…

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

Q: 3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic…

A: Skeletal muscle contraction starts at the neuromuscular junction, which is the synapse between a…

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: Which of the following regions of a sarcomere at rest is characterized by the presence of myosin…

A: Myofibrils are made up of sarcomeres,  It gives striated appearance to the skeletal muscles because…

Q: Place these structures in order from LARGEST structure to SMALLEST: A) Myofibril  B) Myofilament…

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Q: Experimenters can separate F-actin thin myofilaments frommyosin thick myofilaments. First they…

A: Muscle tissues can change their length in response to the stimulus.

Q: The purpose of transverse tubules is to Select one: a. ensure a supply of glycogen throughout the…

A: Transverse tubules are basically the structures present in the muscles,they are the invaginations or…

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: What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation?…

A: Muscle contraction is the action of activation and generation of tension sites with 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: 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: 51- are links between the Filamentous F-actin of thin filaments and myosin heads of thick filaments.…

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

Q: An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about…

A: Introduction  Neurotransmitters released by the motor neuron that innervates a muscle cell cause it…

Q: Which of these steps in the production of force by myosin is INCORRECT? The binding of ATP to the…

A: As per our honor code, we are authorized to answer one question at a time, since you have not…

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: An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about…

A: calcium ions play a very important role in muscle contraction. Actin and myosin work together during…

Q: Match the ATP duty of myosin to its description…

A: Introduction  ATP Is Essential For Muscle Contractions Because It Frees The Myosin For The Next…

Q: Which of the following statements is true?a. Fast fibers have a small diameter.b. Fast fibers…

A: The skeletal muscle fibers are of 2 types: slow-twitch muscle fibers and fast-twitch muscle fibers.…

Q: The transverse tubular system: A)speeds the transmission of an action potential down the length of a…

A: *Tansverse tubular system is a network of interconnecting rings that surrounds a myofibril. *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: Arrange the steps in the correct order to explain how a muscle fiber contracts.   Myosin and actin…

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Q: Elevated levels of Pi in the sarcoplasm of skeletal muscle fibers would decrease the release of Pi…

A: Cross-bridge cycle is referred to as the phenomenon which involves the actin and the myosin…

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…

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.