Explain why myosin II in a sarcomere can produced force only for that sarcomere contraction and not for that sarcomere extension?

Q: During one cross-bridging cycle in striated muscle one ATP molecule is hydrolyzed. Explain the two…

A: In striated muscles, during a muscle contraction, tropomyosin has to change its conformation to…

Q: Discuss the steps in the hydrolysis of ATP by myosin and how these steps are coupled to the binding…

A: Myosin is the protein that converts ATP, a type of chemical energy to mechanical energy for the…

Q: What prevents cross-bridges from attaching to sites on the thinfilaments in a resting skeletal…

A: Muscles are the tissues able to contract in response to stimuli.

Q: n order to study and understand muscle diseases, one needs to have a good understanding of normal…

A: Muscles contract in a repeated pattern of binding and releasing between the two thin and thick…

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: 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: During sarcomere contraction, which of the following does NOT change length? A the distance between…

A: 1. troponin, tropomyosin and myosin After the release of calcium from the sarcoplasmic reticulum,…

Q: (a) Describe the structure of a sarcomere and indicate the relationship of the sarcomere to…

A: NOTE:- "As you have posted two parts under one, we will solve the first part for you, to get the…

Q: Troponin C has been mutated such that it cannot bind to calcium. Describe the effect of this…

A: Troponin C (TnC) is the metal-binding supermolecule monetary unit that initiates the sequence of…

Q: How does the arrangement of myofilaments produce the characteristic striations of skeletal muscle…

A: Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth…

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: In relaxed muscle, the myosin-binding site on adin is blocked by ?

A: Step 1 Contractile elements of muscle fibre are myofibrils. They are made up of contractile units…

Q: A skeletal muscle can often maintain a moderate level of active tension for long periods of time,…

A: A neuromuscular junction also called the myoneural junction is a chemical synapse between the motor…

Q: Describe the sequence of events by which an action potential in a motor neuron produces an action…

A: Tendons attach skeletal muscles to the bone. Numerous bundles which make up the skeletal muscle are…

Q: Striated muscle twitch force reaches a maximum after nearly all of the calcium is pumped out of the…

A: The correct answer is:D.) Calcium is the initial switch to turn the actin thin filament on and then…

Q: How does the latchbridge mechanism within smooth muscle cells influence (a) the amount of ATP…

A: Myosin cross-bridges remain connected to the actin by the Latch bridge mechanism for some time after…

Q: What are the three functional types of proteins found in a myofibril?

A: A muscle fiber is made of many Myofibril and myofibrils are made of many myofilaments. Myofibrils…

Q: At the level of the sarcomere, explain the sliding filament model for how muscle contracts

A: Muscle contraction and relaxation is one of the main reasons that aid the movement or locomotion of…

Q: Describe the organization of myosin, actin, tropomyosin, and troponin molecules in the thick and…

A: Introduction: The myofibrils are made of parallel bundles of protein microfilaments referred to as…

Q: Explain with diagram Transverse tubules and sarcoplasmic reticulum in a single skeletal muscle…

A: A muscle is an animal tissue and composed of muscle cells. These cells consist of protein filament…

Q: What are the mechanisms for muscle contraction vs. relaxation in regards to myosin/thick…

A: The mechanism of contraction of skeleton muscle was based explain through "sliding filament theory"…

Q: What is the function of myosin light-chain kinase in smooth muscle?

A: The muscular framework is an organ framework comprising of skeletal, smooth and heart muscles. It…

Q: List the various Myofibril Structures?

A: Myofibrils are made up of proteins organized into filaments. The filaments can be thick filaments or…

Q: Myosin filaments iterdigitate with actin filaments in order to bring about muscle contraction.…

A: The process of muscle contraction is necessary for the normal physical activities of the body. Force…

Q: Describe the structure of the sarcomere and explain how it enables muscle contraction according to…

A: Answer- The sarcomere is the functional unit of the muscle and it has the central role in the muscle…

Q: Briefly discuss the abundance of sarcoplasmic reticulum in skeletal muscle in relation to its…

A: The sarcoplasmic reticulum is the major intracellular organelle for controlling the cytosolic…

Q: Describe the structural features of a neuromuscular junction andthe role of acetylcholine in…

A: Introduction  Complex organisms such as Multicellular organisms needs control and coordination…

Q: distance runners. All of tl igher concentration of gl

A: Elite sprinters make use of type II fibers more than other muscle fibers and are fast glycolytic…

Q: During cross bridge cycling in skeletal muscle, force is created by the power stroke of the: actin…

A: The cross bridge cycling exhibits the shortening of muscles because of the movement of the…

Q: What is the difference between a myofilament and a myofibril?

A: The muscle is a soft tissue that is highly specialized in creating stress, resulting in strength…

Q: Please describe when the myosin heads grab and pull on the active sites in the actin fibers

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

Q: Explain the specific role of acetylcholine (ACh) instimulating a muscle fiber to contract.

A: Acetylcholine (ACh) is a neurotransmitter that is secreted by the nerve terminals into the synapse.…

Q: List five proteins of the myofilaments and describe their physical arrangement.

A: The myofilaments are the proteins that make up the contractile elements of muscle cells. There are…

Q: Describe the length-tension relationship in skeletal muscle fibers.

A: The skeleton muscle varies in shape, size, and arrangement of fibers. These range from small strands…

Q: Briefly explain ultrastructrure of myofibril.

A: The human skeletal muscles are made up of many muscle bundles or fascicles. Different muscle bundles…

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.