When a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are happening on the cellular level (MULTIPLE SELECT)? A. Increased calcium release from the SR B. Increased firing of action potentials from the alpha motor neuron

Q: Muscle relaxation occurs when ________. a. calcium ions are actively transported out of the…

A: The human body is a well built machine in which all the organs coordinate together to make it work.…

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: 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: Unlike skeletal muscle cells, cardiac muscle cells________."   A do not use the sliding filament…

A: Muscle is a soft tissue present in various animals.Muscle cells are composed of protein filaments of…

Q: During a concentric contraction of a skeletal muscle fiber, myofibrils a. lengthen. b. remain the…

A: Muscle fibers are composed of myofibrils. The myofibrils are made up of myosin and actin filaments…

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: Through which ATP-generating mechanism can long-lasting muscle contractions be sustained? a.…

A: Introduction :- Muscle contractions are defined by changes in the length of the muscle during…

Q: Summation in a single muscle fibre means that Select one: a. the fibre increases the frequency of…

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

Q: The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so…

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

Q: a. Describe the relationship between stimulus voltage and the force of contraction b. What was the…

A: The threshold stimulus voltage is found by varying the stimulus voltage slightly to discover the…

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: How does the AP in the motor neuron cause calcium release in the muscle fiber?

A: Action potential refers to the depolarisation of neuronal membrane which is required for the…

Q: Muscular atrophy occurs when: A. A patient lacks the coordination needed to walk normally. B. Muscle…

A: Muscular atrophy refers to the loss of skeletal muscle. The atrophied muscle normally smaller and…

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: A skeletal muscle motor unit   A.Is the number of muscle cells innervated by one motor neuron. B.Is…

A: The skeletal system consists of bones and muscle fibres. These muscle fibres help in contracting and…

Q: Describe the roles of ATP in the sliding filament mechanism of skeletal muscle contraction.    (b)…

A: Sliding past theory explains the process of various muscle proteins such as actin and myosin sliding…

Q: What would be affected if the globular head of myosin was misshapen? a) The ability to bind to…

A: Myosin is a protein, but specifically, a motor protein and a fibrous globulin of muscle that can…

Q: In a skeletal muscle fiber, Ca2+ is released from a. ACh receptors. b. the motor end plate. c. the…

A: Skeletal muscle mainly attaches to the skeletal system via tendons to maintain posture and control…

Q: In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules.…

A: Calcium triggers contraction by reaction with regulatory proteins that in the absence of calcium…

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: Which of the following is false regarding smooth muscle? A. It contracts slower than skeletal…

A: There are three types of muscles skeletal, cardiac and smooth muscles.

Q: if, in a laboratory, a skeletal muscle cell receives a single stimulus to contract, it produces a…

A: As per our honor code, we are authorized to answer only one question at a moment. So, we are…

Q: Which of the following would be recruited in a muscle stimulation when contractile strength…

A: Small motor units, typically consisting of one nerve and a few muscle cells, are recruited first.

Q: structural organization of muscle fibers makes it possible to produce contractile force

A: Answer: Sarcomere of Muscles fibre or myofibre is the basic contractile unit of skeletal muscle.

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

A: Myogenesis is the process of formation of muscles from the mesodermal layer of embryonic germ cells.…

Q: Repetitive stimulation of a skeletal muscle fiber will cause an increase in contractile strength…

A: Skeletal muscles are voluntary muscles. Skeletal muscles are striated because of presence of…

Q: Select the best answer or answers from the choices given: The function of the T tubules in muscle…

A: Muscle contraction can be defined as the process in which the length of the muscles decreases and…

Q: Suppose a drug blocks entry of calcium from the extracellular fluid. What if, anything, would happen…

A: Muscle cells are specialized cells that use contractile motion for movement either voluntary or…

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: What is represented on the image above? (A) A cross-section of a cardiac muscle B A longitudinal…

A: Introduction Muscles are soft tissues, Many, stretchy fibers make up our muscles, muscle is a group…

Q: Rigor mortis occurs following death because a. tropomyosin remains over the myosin binding sites of…

A: Introduction: Rigor mortis helps in assessing the time since death to determine if the body had been…

Q: The excess ATPs are stored in muscles as CPs? A. True B. False

A: Adenosine triphosphate (ATP) is a three-phosphate nucleotide. The addition of phosphorous to the…

Q: Describe the Neural excitation of the muscle and Describe how a signal arriving at the axon terminal…

A: Neurons are the basic unit of the nervous system that carry electrical stimuli throughout the body.…

Q: What is the role of calcium in muscle contractions? Multiple Choice   a) To spread the action…

A: Muscle contraction It is the activation of tension-generating regions in the muscle fibers. It…

Q: A bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle.…

A: (c) the ability to stimulate the muscle is impaired

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: 1. A receptor absorbs the energy of a stimulh by means of a. Reception b. Transmission c.…

A: Physiology is defined as the study of the way the human body works. It tells the basic and complex…

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: The fast fatigable motor units are used predominantly for which of the following activities?…

A: Fast fatigable motors are used when large forces for a short time are required.

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: Which statement or statements describe the role of calcium in the stimulation of muscle fibers?…

A: Muscles are defined as soft tissue that can undergo contraction, movement production, and maintain…

Q: a) Describe how the isolated muscle behaved as it was stretched progressively. b) What effect…

A: The all-or-none principle asserts that the intensity of a nerve cell's or muscle fiber's reaction is…

Q: When Skeletal muscle contracts an arrangement of the alternating light and dark bands traversing…

A: During muscle contraction calcium is released from the sarcoplasmic reticulam which binds with the…

Q: Predict the effect of the following on muscle contraction: A. Bitten by a black widow B. Curare C.…

A: Muscle contraction refers to the generation of tension at specific sites in the muscle fibers. 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: Smooth muscles relax when: a) myosin kinase phosphorylates the myosin head b) myosin phosphatase…

A: Smooth muscles relax when myosin phosphatase removes a phosphate group from myosin. (Option B is…

Q: Calmodulin is found in smooth muscle cells and performs a similar function to troponin in striated…

A: Smooth muscle is found in the walls of hollow organs like your intestines and stomach. They work…