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: Which is the order of glycolytic capacity between these muscle fiber types O I> lla > Ilx O Ix > la…
A: The contraction of the muscle fibre is explained by the muscle contraction theory by the 2 muscle…
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: Myosin heads bend when attached to actin
A: Correct option is C Myosin heads bend when attached to actin
Q: Hill's equation gives a relation between muscle contraction rates νν and muscle tension TT…
A: We have to rewrite the equation in a form to show that T is dependent on v including T0, alpha and…
Q: Arrange the steps of muscle contraction in the correct order Myosin head forms cross bridge with…
A: Tissue comprises structurally and functionally similar cells. It is a level of organization in…
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: Discuss about Ca2+-dependent thin-filament regulation of skel-etal muscle contraction.
A: Movement of skeletal muscle in mammalians show large variability in its functions with their…
Q: Explain the characteristics of these muscle fibers: slow twitch, fast twitch oxidative and fast…
A: Skeletal muscle fibers are striated tissues. These tissues are under the control of the somatic…
Q: .The poison ouabain (wah-BAY-in), or arrow poison, blocks the Na+ K+pump. What effect would this…
A: Ouabain is also called the g-strophanthin. It is a toxic substance derived from a plant that was…
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: 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: During muscle isometric tension, the maximum tension occurs when: O a. There is no overlapping…
A: Isometric contraction occurs when muscle length remains relatively constant as tension is produced.…
Q: Myofibis in muscle fibres are made up of repeating units of dark and light bonds called
A: Myofibril is a muscle cell that is shaped like a rod. Many chains of Myofibril bound together to…
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: Discuss ATP-driven myosin movement along actinfilaments.
A: The actin filament is linear globular actin polymer subunits. These occur as microfilaments in the…
Q: Looking at this diagram explain the order of size dependent recruitment of motor units during muscle…
A: The smallest functional unit is made up of a motor neuron and the skeletal muscles that are attached…
Q: Skeletal muscle cells undergo contractions based on a molecular mechanism involving: 1)the sliding…
A: The skeletal muscle cells contract by using myosin and actin filaments. These cells are accountable…
Q: What evidence supports a sliding filament-cross-bridge mechanism of contraction in smooth muscle?,…
A: The evidance for sliding filament cross bridge mechanism is inferential and derived from…
Q: Calcium is the trigger for contraction of all muscle types. How does its binding site differ in…
A: In the human body, there are three types of muscles, skeletal muscles, cardiac muscles, and smooth…
Q: The functional unit of skeletal muscle is the sarcomere area between two Z lines and sarcomere area…
A: Skeletal muscles are also known as striated muscles as they are striped or striated. It is a…
Q: Based on your understanding of skeletal muscle fiber physiology, which of the following processes is…
A: ATP is the adenine tri phosphate and is the instant source of energy .It is used in many of the…
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: Label different areas of an individual muscle unit known as a sarcomere below: Actin A Band Mline Z…
A: The sarcomere is the contraction unit in the skeletal muscles that are under the control of motor…
Q: Thick myofilaments contain which of the following? (Select all that apply) troponin actin myosin…
A: Myofilaments are key regulators of the contraction in cardiac and skeletal muscles. The thick-thin…
Q: Myosin's affinity for actin occurs Following the power stroke When myosin is energized When a new…
A: Myosin is a fibrous globulin of muscle. It split ATP and react with actin in muscle contraction.…
Q: Repetitive stimulation of a skeletal muscle fiber will cause an increase in contractile strength…
A: Muscles are tissues which helps in locomotion and motion . There are different types of muscles in…
Q: The contractile unit of a muscle fiber is called: O myosin O actin sarcomere O sarcolemma
A: Introduction :- Muscle fibres are made up of just one muscle cell. They aid in the control of the…
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: Give an account of the excitation-contraction coupling (Figure 3) in skeletal Highlight the role of…
A: Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be…
Q: Alter death, calcium pumps no longer fünction and the calcium ion concentration of muscle fiber…
A: * After death of an animal or organism the calcium pump stops hence calcium should not be pumped and…
Q: smooth muscle fiber contain only one nucleus in the center. O False True
A: A collection of cells with similar structures and functions is referred to as a tissue. The gaps…
Q: Place these structures in order from LARGEST structure to SMALLEST: A) Myofibril B) Myofilament…
A: Each skeletal muscle is an organ that consists of various integrated tissues. These tissues include…
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: "When a muscle develops increased tension, but does not shorten, it is said to exhibit" O isotonic…
A: Muscle contraction is the development of tension in the muscle fibers. It can be described with two…
Q: In smooth muscle fibers, the thin filaments attach to structures called functionally similar to Z…
A: Muscular tissue is made up of long cells of muscle fibers. It has contractile proteins that are…
Q: Why is myosin II the only myosin capable of producing contractile force?
A: Introduction Myosins are a group of motor proteins that play a key role in muscle contraction and a…
Q: Myosin myofilaments area. attached to the Z disk.b. found primarily in the I band.c. thinner than…
A: The actin-myosin interaction is most commonly known for its role in sliding filament theory, where…
Q: Smooth muscle contraction is controlled by releasing neurotransmitters trom: Presynaptic cleft O…
A: Smooth muscle contraction is controlled by releasing neurotransmitters from:
Q: Which of the following regions of a sarcomere does not change length during a contraction because it…
A: Skeletal muscles are voluntary muscles. The contraction and relaxation in the skeletal muscle enable…
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 cell membrane of a muscle fiber is called________.a. myofibrilb. sarcolemmac. sarcoplasmd.…
A: Muscle is a soft tissue which is found in most animals. They are helpful in providing movement and…
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: 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 muscle contraction is initiated by Select one: a. adenosine diphosphate (ADP) b. adenosine…
A: Answer1-d. A nerve impulse. Muscle contraction begins when the nervous system generates a signal.…
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…
Q: A potential benefit of recruiting slow oxidative fibers for contraction before recruiting fast…
A: In skeletal muscle fibers, contraction in Slow oxidative (SO) fibers is relatively slow and use…
In relaxed muscle, the myosin-binding site on adin is blocked by ?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- What is the reaction catalyzed by the ATPase domain of myosin?Why is myosin II the only myosin capable of producing contractile force?As mentioned in class, one additional major use of ATP in skeletal muscle (besides powering the myosin heads) is the recycling of calcium ions back into the sarcoplasmic reticulum after depolarization. The resting concentration of Ca++ in the muscle cell cytoplasm is about 50-100 nM, and the spike concentration after depolarization is about 10-20 μΜ. a) Consider a single sarcomere. What is the number of free calcium ions within the sarcomere at rest? What is the number of free calcium ions after depolarization? b) The major ion pump responsible for calcium ion recycling is SERCA (sarco/endoplasmic reticulum calcium ATPase). SERCA uses one molecule of ATP to pump two calcium ions, and the resting level can be restored in about 10-20 ms. How many molecules of ATP are used in a single sarcomere for pumping calcium in a single "twitch"? c) Assume that a single "twitch" is sufficient to drive one sarcomere from its fully extended length (about 2.5 µm) to its fully contracted length (about 1…
- What is the function of myosin light-chain kinase in smooth muscle?ctions in smooth muscle cells depend on which one of the following activation steps? Ca2+-activated phosphorylation of myosin-II Ca²+ binding to troponin GTP binding to myosin-II Actin polymerization (b) (c) (d) Explain:During one cross-bridging cycle in striated muscle one ATP molecule is hydrolyzed. Explain the two times when the energy from this hydrolysis is used, and what “work” is done in each case.
- During an experiment, the protein troponin from a skeletal muscle fiber was removed. This resulted in the permanent exposure of the actin binding site. Predict how cross-bridge cycling in this skeletal muscle fiber would be affected in the absence of troponin.The sliding-filament model of skeletal-muscle contraction assumes a sliding or slipping of interdigitating filaments of actin and myosin. Electron micrographs show that during contraction the actin and my-osin filaments remain of constant length while the distance between Z lines shortens. Explain how this happens in terms of the molecular structure of the muscle filaments. What is the role of regulatory pro-teins (troponin and tropomyosin) in contraction?What are the mechanisms for muscle contraction vs. relaxation in regards to myosin/thick filaments/thin filament movement? Is it true that if tropomysin blocks myosin sites, contraction ends and muscle relaxes?
- Myofibis in muscle fibres are made up of repeating units of dark and light bonds calledCertain multi-headed myosins bind cooperatively to actin filaments. The binding interaction is mainly electrostatic in nature, so the presence of additional salt (ions) in solution can interfere with binding; ions will tend to associate with charged residues on the two proteins, blocking electrostatic attractions that would otherwise take place. Briefly describe the expected shape of the binding curve for one of these myosins, and what will happen to the shape when the salt concentration increases.What is myosin light-chain phosphatase?