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

Q: The mechanism of muscle contraction is best explained by the sliding filament model. According to…

A: Many different forms of cell motions are caused by actin filaments, which are often linked to…

Q: In the process of muscle contraction, which of the following steps immediately precedes the sliding…

A: Muscle cells are specialized for contraction. Muscles allow for motions such as walking, and they…

Q: Predict what might happen to a muscle cell that is extensible but not elastic. What if the reverse…

A: Extensibility and elasticity are the properties of every muscle of the body.  Extensibility is…

Q: You discover a mutant mouse whose skeletal muscles do not work properly.  You remove a piece of…

A: Acetylcholinesterase or acetylhydrolase is a cholinesterase enzyme primarily found at neuromuscular…

Q: This player in smooth muscle contraction is analogous to troponin in skeletal and cardiac muscle…

A: The muscular system is one of the major organ systems in the body. It contains three forms of…

Q: Which of the following statements best describes the sliding filament mechanism of muscle…

A: Actin- It is the main component of thin filament in muscle fibre, cytoskletal protein. Myosin-motor…

Q: During evolution, skeletal muscle became adapted to functional de-mands ranging from sudden,…

A: The skeletal muscles of vertebrates are composed of different types of fibers. This includes slow…

Q: In a classic experiment, the strength of a neural stimulus and the resulting muscle contraction are…

A: Neurons are the basic building blocks of the nervous system.

Q: Why would skeletal muscle be unsuitable for the wall of the urinary bladder? Explain how this…

A: The human excretory system comprises of one pair of metanephric kidneys that is retroperitoneal in…

Q: A mutation has occurred that prevents ATP from binding from the heads of myosin. What impact would…

A: Mutation is defined as any sudden change in the nucleotide sequence of genes. It may also be defined…

Q: What structure in skeletal muscle cells functions in calcium storage?   a.myofibrillar network…

A: Skeletal system is one of the important organ systems of the body. It provides a structural and…

Q: If you add calcium to the bath around the earthworm smooth muscle, what would you expect will happen…

A: Introduction  Earthworms have smooth muscle in their body walls which helps them in movement and…

Q: Tetanus is a disease caused by Clostridium tetani characterized by muscle spasms. Just like the…

A: Both Clostridium tetani and Clostridium botulinum are gram positive, anaerobic, non- motile and…

Q: Arthropod muscle fibers typically do not generate action potentials. Using your knowledge of their…

A: Arthropods are with jointed appendages and a chitinous exoskeleton. They are modified to live in…

Q: muscle differs from skeletal muscle in: (more than one answer may be correct) Question 6 options:…

A: Smooth muscle are involuntary muscles where as striated muscles are voluntary muscles. Involuntary…

Q: Muscle contraction involves a protein conformational change called the power stroke. Where…

A: Each myosin motor protein possesses ATPase activity and functions in a cyclical manner that couples…

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: Calcium ions are responsible for unmasking of active site on which protein for cross bridge activity…

A: The muscle fibers contain sarcomeres that are the structural units responsible for muscle…

Q: Which of the following describes a similarity between cardiac and smooth muscle cells?a. An action…

A: Introduction: The soft tissue present in mammals is muscle. The muscle cells comprise protein…

Q: What happens in a muscle twitch? a. Myosin grabs a thick myofilament. b. Sarcomeres shorten during…

A: Muscle twitches can occur for heaps of reasons like stress, an excess of caffeine, a horrible eating…

Q: During muscle contraction, some energy is supplied from creatine phosphate. Which of the following…

A: Muscle contraction occurs when tension-generating sites within muscle cells are activated.

Q: What structure on a muscle fiber is composed of largely two varieties of contractile proteins--actin…

A: Muscle fibre is a single muscle cell. These muscles help control our bodily movement.

Q: How are motor neurons involved in muscle contractions? Select all that apply. The release of calcium…

A: It is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord and…

Q: Why is adenosine triphosphate (ATP) used for muscle contraction?

A: Muscle contraction is a process in which muscle shortening occurs due to the movement of the actin…

Q: Explain the structure of dynein and kinesin and how their structures aid in organelle movement…

A: Dynein and kinesin are two of the cellular major motor proteins involved in the long range transport…

Q: A muscle is attempting to avoid being eaten by a starfish by tightly closing its shell. Is this an…

A: Introduction Muscle tone is the amount of tension in the skeletal muscles at rest, and it helps to…

Q: ATP is a limited source of energy for skeletal muscle contraction. The cell has other ways of…

A: ATP is required for muscle contraction. Four sources of this substance are available to muscle…

Q: Chickens are capable of only brief bursts of flight, and their flying muscles consist of fast…

A: Introduction: Wings of birds are responsible for giving them flight. They possess feathers and the…

Q: In muscle cells, myosin molecules continue moving along actin molecules as long as: "A ATP is…

A: As per batleby guidelines we have to answer only first questions: You may repost rest of the…

Q: Myosin binds to actin, then bends. What is ATP needed for next? A. to pump the Ca++ “keys” back into…

A: D option is the correct statement.

Q: A study of muscle fibers between chimpanzees and humans revealed that although muscle mass per body…

A: Red muscles have slow-twitch fibers which can contract slowly for a long period of time without…

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: How is the list below to be properly put in order to describe a muscular contraction?

A: Muscle contraction can be defined as the activation of tension-generating sites that are present…

Q: Some smooth muscle has the ability to contract spontaneously—that is,it contracts without any…

A: Smooth muscle can be defined as one of the muscle types found in humans which is made up of multiple…

Q: When neurotransmitters contact a muscle cell's receptor proteins, those receptors change their shape…

A: Introduction: Receptors:Receptors are specialised structures that can be found in the cell membrane.…

Q: Compared to skeletal muscle, smooth muscle None of the choices are correct Has equal thick and thin…

A: Similar to skeletal muscle, smooth muscle's main job is to contract. To produce movement, however,…

Q: The sliding filament model depicts how myosin motors attached to actin lead to muscle contraction.…

A: Introduction:- There are different types of muscles present in our body - skeletal muscles, smooth…

Q: What do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types…

A: The skeletal muscles are a form of striated muscle under voluntary control of the somatic nervous…

Q: The role of creatine phosphate in muscle cells is to: provide energy for muscles during extended…

A: Creatine phosphate serves as an “energy buffer” in muscle it is a high-energy, phosphorylated,…

Q: The prospect of inhibiting myostatin and growing larger muscles may be tempting to a great many…

A: Muscles are the soft tissues present in the body and the cells consists of the protein filaments…

Q: Crossbridges that form during muscle contraction are a bond between:   A. Myoglobin and Troponin…

A: The muscle contraction process occurs in various steps which are listed below; Depolarisation and…

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: When a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are…

A: INTRODUCTION When a muscle is stretched, some of its fibers lengthen, but other fibers may remain at…

Q: Which of the following could prevent skeletal muscle from contracting?   Select one or more: a.…

A: Actin (spherical) and myosin (motor) are the major proteins in the muscles. Actin monomers aggregate…

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.