What causes the variations kn the measurements for the twitch amplitudes for different twitches?

Q: In your own words, describe the main events occurring between the arrivalof an action potential at a…

A: The chemical synapse that favors the transmission of the signal from the motor neurons to the muscle…

Q: what can you conclude about superposition muscle contraction?

A: Muscle contraction happens when the thin actin and thick myosin filaments slide over each other. It…

Q: Note the color of each three types of muscle fiber: slow twitch, fast twitch oxidative and fast…

A: Slow twitch muscle fibers:  Resistant to fatigue  For sustained,smaller movements and control of…

Q: During this silent period what structures are likely to be producing trunk extension torque? Is this…

A: The muscle activation pattern illustrated is termed the myoelectric ‘silent period’, or…

Q: Is there a difference in the time to fatigue of the dominant and non-dominant arm? Cite relevant…

A: The dominant forearm is the strongest forearm naturally. It is the hand that is always chosen to…

Q: What is migrating myoelectrical complex (MMC)?

A: At fasten time, The contraction of muscle in stomach and in small intestine to clean the residual of…

Q: Describe the three pathways by which muscles can produce theATP they need to contract.

A: Man needs the energy to do work, that energy is not directly obtained from the food he/she consumes.…

Q: Describe the stages of a twitch contraction and explain how a twitch is affected by the frequency of…

A: Twitch contraction: Contraction of the muscle fibres occurs when the action potential travels down…

Q: What happens when theoxygen supply is insufficientto maintain aerobic cellularrespiration during…

A: Cellular respiration is a combination of metabolic reactions that occurs in the cells of organisms.…

Q: 83% of the total number of fibers examined in the vastus lateralis and nearly 61% of the…

A: Fast-twitch muscles fibers : These muscles are specialized for powerful forces but can be employed…

Q: The single-fiber twitch experiments shown here were generated by stimulating the muscle cell…

A: When a muscle is triggered by a single vibration, an action potential is generated that causes the…

Q: Explain the phases of a twitch contraction.

A: The contraction generated by one action potential is termed a muscle twitch.

Q: Describe the events that result in the relaxation of skeletal musclefibers?

A: A smooth, sustained contraction from the rapid stimulation of skeletal muscle fibers is called…

Q: Explain the types of exercise that require more fast-twitchversus slow-twitch muscle fibers.

A: Skeletal muscles are made up of different types of muscle fibers (cylindrical muscle cell) which…

Q: List the three typical stages of a muscle twitch, as seen in amyogram.

A: Myogram is a graphic representation of the phenomena of muscular contractions.

Q: Compare the force produced by a muscle over timewhen it is stimulated by a single twitch stimulus…

A: Muscle strength formation refers to the mechanism in which the skeletal muscle transforms metabolic…

Q: Describe the functions of gamma motor neurons and explain why they are stimulated at the same time…

A: The gamma motor neurons innervate the muscle spindle at every finish. they permit contraction of the…

Q: Briefly explain ultrastructrure of myofibril.

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

Q: How does speed of muscle action affect the following relationships; force-velocity and force-power?

A: Muscle action : There are three types of muscle contractions i.e. concentric, isometric and…

Q: Describe a muscle twitch and the events that occur ineach phase of a twitch.

A: A single brief threshold stimulus cause contraction followed by relaxation. This kind of response is…

Q: What causes the variation of the measurements for the periods (latent, contraction, relaxation…

A: Motor neurons that are located in the motor cortex of the brainstem or the spinal cord innervate…

Q: If the muscle fiber is stretched to 150% of muscle length and thentechnically stimulated, what would…

A: Muscle contraction is shorting of length of muscle which  lead to locomotion and movement. Most…

Q: What is the main active muscle group across the (i) right knee joint and (ii) right ankle joint…

A: INTRODUCTION Muscles are group of muscle fiber they can contract and relax and they produce force.…

Q: Why is tetanic tension so much greater than twitch tension?

A: Tetanic contraction is a muscle contraction produced through the high rate action potential…

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: e events involved from the time a motor neuron fires an action potential to the time when the muscle…

A: Neurons are the nervous system's basic functional unit. They play a role in neurotransmitter…

Q: C. The single muscle twitch. Duration of latent period O 012 = % of total twitch time sec % Duration…

A: Twitch:- Muscle contractions, also known as fasciculations, are small, involuntary muscle…

Q: Does the H zone length change when a muscle contracts? Explain.

A: A muscle cell contracts and the the sarcomere shortens . However, the thick and thin filament of…

Q: How are ion channels affected by receptors that stimulatesmooth muscle contractions? That inhibit…

A: Due to change in membrane potential muscle contraction occur.

Q: Identify the ways that increased IP3 can cause contraction.  Identify the ways that increased cAMP…

A: 1.  The contraction of the smooth muscle is generated due to the production of several…

Q: On the sustained contraction recording, indicate when the muscle twitches began to combine…

A: The neuron that transmits the stimulus to muscle is known as motor neuron. The motor unit consists…

Q: What are the different muscle contractions in relation to the squats? Explain

A: There are four types of muscle contraction that are :  Isometric, isotonic, eccentric, concentric.…

Q: At what frequency of stimulation did tetanic contraction occur?

A: The muscles are stimulated by the nerve impulses causing the contraction of the muscles. The muscle…

Q: Describe the difference in distribution of these three types of muscle fiber: slow twitch, fast…

A: Anatomy and physiology are the branches of biology, anatomy deals with the study of the structure of…

Q: why does a rapid series of muscle twitches yield a stronger overall contraction than a single…

A: Muscle contraction that results from a single action potential is called a twitch. When there is a…

Q: How does varying the frequency effect contraction force? Which interval caused the greatest…

A: * contractions is of three types mainly Isotonic  Eccentric Concentric *Concentric contractions…

Q: Why does Neostigmine cause an increase in the twitch tension when the nerve is stimulated and not…

A: Because neostigmine acts on nerve terminal increasing acetylcholine concentration by inhibiting…

Q: What voltage produced maximal contraction of this muscle?

A: Muscle is a soft tissue which is found in most animals. They are helpful in providing movement and…

Q: Describe the effects of histamine and NO on smooth muscle activity.

A: Histamine is released in various tissues and maintains immune response, regulates physiological…

Q: How does muscle tone change during contraction.

A: A muscle consists of many muscle, a muscle cells are organised into functional groups called motor…

Q: Why is it advantageous to have a highly folded sarcolemma at the motor end plate?

A: Neuromuscular junction is area or junction or connection between the end of the motor nerve plate…

Q: What is the steps in the Sliding Filament theory of muscle cell contraction in correct order?…

A: Muscles play an important role in the movement, locomotion, contraction, digestion, etc. Muscles are…

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.