Q: Why do Fast-glycolytic fibers fatigue rapidly?
A: Introduction: The soft tissue present in almost all mammals is the muscles. The muscle cells…
Q: What is the repeating sequence of collagen and how is it essential to the structure of the triple…
A: Collagen is a fibrous protein that is abundantly found in the human body and plays a crucial role in…
Q: Describe the role of Vitamin C in collagen synthesis. In your discussion, name the substrate and…
A: Collagen is a structural protein responsible for skin formation. To produce it vitamin C is…
Q: What is the rationale for the inhibition of muscle glycogen phosphorylase by glucose 6- phosphate…
A: Glycogenolysis- breaking down of molecular glycogen into glucose. Glycolysis- glucose molecules…
Q: In the past, it was believed that lactic acid accumulated in the muscles of tracking athletes as a…
A: Pls refer below for the solution :
Q: How does the neuromuscular junction illustrate the general principle of physiology that the…
A: The synaptic connection between the muscle and the terminal end of a motor neuron is called the…
Q: As mentioned in class, one additional major use of ATP in skeletal muscle (besides powering the…
A: Assumptions:The volume of a single sarcomere is roughly cylindrical.The average diameter of a…
Q: What are Fast-glycolytic fibers?
A: Muscle tissues are made up of muscle fibers that are composed of myofibrils composed of sarcomere…
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: Magnesium blocks voltage-gated calcium channels on the membrane of smooth muscle cells. How do…
A: Inorganic ions are also important players in regulating our metabolism and overall working may it be…
Q: What are oxidative fibers?
A: The skeletal muscle fibers are characterized based on the metabolic processes undergoing inside them…
Q: Impairment of intracellular calcium homeostasis in muscle fibers lead to chronic, severe muscle…
A: The sarcoplasmic reticulum(SR) regulates the amount of calcium in muscles. Following an increase in…
Q: Cardiac and skeletal muscle are both “striated” types of muscle and yet they have very distinct…
A: The skeletal muscles are a part of muscle tissue in the body. They are attached to the bones by the…
Q: Sarcolemma is the plasma membrane of the muscle fiber. Myosatellite cells, remain closely associated…
A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: A 48-year-old man has hepatic cancer that is unresponsive to standard therapy. He enrolls in a…
A: The objective of the question is to identify the most likely cause of muscle weakness in a patient…
Q: Accumulation of which of the following substances in muscle cells is the cause of stiffness and…
A: Muscle fatigue refers to the decline in muscle force generated over sustained periods of activity or…
Q: Muscles may become hypoxic during the early stages of exercise, causing lactate to build up. a)…
A: Organic acids, such as lactic acid, are acids that are made up of carbon atoms. In its solid state,…
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: What is the reaction catalyzed by the ATPase domain of myosin?
A: Myosin is a molecular motor responsible for biological motions such as muscle contraction and…
Q: classifications of carbs
A: All the living organisms require energy to carry out different activities of light, for this energy…
Q: Under certain stable concentration conditions, actin monomers in their ATP form will polymerize to…
A: Actin is the protein that makes up microfilaments, a type of cytoskeletal filament, and the…
Q: Contraction of both skeletal and smooth muscle is triggered by an increase in cytosolic Ca2+.…
A: Muscle tissue are the type of tissue which undergo continuous relaxation as well as contraction that…
Q: The filaments of skeletal muscle are moved by free energy derived from the hydrolysis of ATP. During…
A: During anaerobic glycolysis, glucose is decomposed into lactic acid and releases energy. In the…
Q: What do you mean by actin myofilaments?
A: Myofilaments are threadlike structures. They comprise the myofibrils inside the muscle cells. There…
Q: A few hours after the death of an animal, the corpse will stiffen as a result of continued…
A: Rigor mortis is the state of the body caused after death in which the muscles of the body remain…
Q: What properties of fast glycolytic and slow oxidative fibersadapt them for different physiological…
A: Introduction: The soft tissue in mammals is muscle. The muscle cells comprise protein filaments,…
Q: Weight training causes fast glycolytic fibers to hypertrophy (increase in diameter). Explain why…
A: Hypertrophy is a term used to refer to an abnormal enlargement of an organ or tissue from the…
Q: Shortly after a person dies, Ca2+diffuses out of the saroplasmic reticulum and the body becomes very…
A: Rigor mortis is the stiffening that occurs in the muscle fibres after death which causes the whole…
Q: Suppose myoglobin is prepared with Zn²+ in the place of Fe²+ in the porphyrin. Would you expect this…
A: Heme is a prosthetic group found in proteins like myoglobin. Heme has a protoporphyrin ring that is…
Q: For a skeletal muscle to remain rigidly contracted, it needs a continual supply of ATP. Yet, when a…
A: The muscular system consists of muscle tissues. It constitutes about 40-50 per cent of human body…
Which of the following statements about glycolytic fibers is true?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- What causes the striated appearance of skeletal muscle? O a. presence of gap junctions O b. regular arrangement of highly organized thick and thin filaments presence of the mitochondria at regular intervals O d. regular arrangement of the T tubules running transversely through the muscle fibreWhich of the following statements about smooth muscle is correct: Select one: O a. Endothelial secretion of NO results in relaxation of blood vessel wall smooth muscle O b. Its activity is not affected by nervous system c. In smooth muscle cells myosin is deactivated by myosin light chain kinase O d. Its contraction is weaker than the contraction of skeletal muscleWhich of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the An burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal contractile-function.
- The glycolytic system by which muscles obtain ATP…Shortly after a person dies, Ca2+diffuses out of the saroplasmic reticulum and the body becomes very still and rigid, a phenomenoncalled rigor mortis (rig′er mōr′tis). Given ATP’s role in myosin head movement, propose an explanation for rigor mortis.The filaments of skeletal muscle are moved by free energy derived from the hydrolysis of ATP. During sustained muscle contraction ATP levels remain fairly constant, while levels of creatine phosphate fall. Explain why this is so. Under what circumstances is an oxygen debt incurred during muscle contraction?
- The “glycolytic” white fibers in Human Skeletal Muscle: a. lack myosin b. are used for rapid contraction “burst” exercise c. oxidize glucose to pyruvate and then release lactic acid into the bloodstream d. produce ketone bodies e. produce ethanolFast-twitch muscle fibers have which of the following characteristics?a. fewer number of mitochondriab. rely on fermentation and creatine phosphate pathwaysc. are primarily anaerobicd. provide for a quick release of energye. All of these are correct.With regard to muscle contraction, which of the following is an INCORRECT statement with regard to the interactions of filaments that occur in the sarcomere? A. When muscles are relaxed tropomyosin blocks binding sites on actin subunits, which keeps cross-bridges from forming. B. The myosin heads conduct a power stroke motion to slide when bound to actin, to move the "thin" filaments towards the center of the sarcomere. C. During contraction, actin subunits are removed from the ends of the "thin" filaments to shorten actin polymers, thus reducing the length of the sarcomere. D. "Thick" filaments are anchored at the M-line, while "thin" filaments are anchored at the Z-line. E. Numerous myosin heads engage with the actin filaments simultaneously, such that there is no back-slipping during the contraction process.
- You know from experience that skeletal muscle tires quite quickly, especially if there is not enough oxygen. Interestingly, shellfish such as clams can maintain a month-long contraction in the muscle that keeps the shell closed. No oxygen gets in this situation. These muscles have a different version of myosin called paramyosin. Knowing what you know about the cellular mechanism of muscle contraction, propose a hypothesis to explain how paramyosin might work.What role (function) does calcium have within a muscle fiber? a. trigger muscle potentials along t-tubules b. trigger contraction by causing the formation of cross bridges c. trigger exocytosis of ACh across the synaptic space d. trigger action potentials along axons e. open voltage gates within the sarcoplasmic reticulum 2. Which of the following are regulatory proteins that allow a muscle fiber to contract when calcium is present? (select all that apply) dystrophin troponin myosin tropomyosin actin 3. During this phase of an action potential, potassium ions exit the cell through voltage gated potassium channels. a. depolarization b. repolarization c. glycolysis d. cross bridge formationA few hours after the death of an animal, the corpse will stiffen as a result of continued contraction of muscle tissue (this state is called rigor mortis). This phenomenon is the result of the loss of ATP production in muscle tissue. (a) Consult Figure 7.48 and describe, in terms of the six-step model of mus- de contraction, how a lack of ATP in sarcomeres would result in rigor mortis. (b) The Ca* transporter in sarcomeres that keeps the [Ca*)-10-7 M requires ATP to drive transport of Ca* ions across the membrane of the sarcoplasmic reticulum. How would a loss of this Ca* transport func- tion result in the initiation of rigor mortis? (c) Rigor mortis is maximal at - 12 hrs after death, and by 72 hrs is no longer observed. Propose an explanation for the disappearance of rigor mortis after 12 hrs.