Which statement about striated skeletal muscle is true?   A. The tension generated by a muscle is invariable.   B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch.   C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch.   D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials.   E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.

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: Which component is responsible for initially stimulating a muscle contraction? a. proteins b.…

A: Muscle contraction can be defined as the increase in the tension or decrease in the length of a…

Q: Calcium plays a crucial role in the contraction of skeletal muscles. i. Where is calcium stored…

A: The sliding filament theory was proposed as an explanation for muscle contraction. It is based on…

Q: what is the function of muscular system

A: Movement is the muscular system's primary purpose. Only muscle tissue in the body has the capacity…

Q: Which statement best summarizes why muscles often work in pairs

A: A tissue that is soft and is found in most of the animal’s skeletal system is known as muscle.…

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: How is electrical excitation of a skeletal muscle fiber coupled to muscle contraction? Speculate…

A: Acetylcholine is released by motor neurons which binds to receptors in the motor endplate. A neural…

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: Suppose a person had an unusual mutation in the troponin protein of his skeletal muscles, such that…

A: The muscular system is a system of muscles where muscles are connected to bones and also to envelope…

Q: Which statement is accurate about an agonist? a. It opposes the function of the prime mover. b. It…

A: The majority of the animals consist of soft tissue called muscles. They are responsible for…

Q: Describe the events by which depolarization of a smooth muscle cell results in contraction and…

A: Smooth muscle is a kind of muscle that is used by various systems to apply pressure on organs and…

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: Propose an explanation for the fact that the body stiffens after death

A: After death, when the muscles of the body become very inextensible and stiff, this condition is…

Q: Explain Why is muscle that has sustained significant damage unable to produce the same amount of…

A: Muscle cells are cells that contract to help in movement. Voluntary movement is controlled by…

Q: Which characteristic or component is NOT shared by skeletal muscle and cardiac muscle? I. Electrical…

A: There are three types of muscles in the body. Smooth muscles and cardiac muscles are involuntary…

Q: Explain how cardiac muscle differs from skeletal muscle in its structure and regulation of…

A: The cardiac muscle is striated similar to skeletal muscle. The sarcomeres of cardiac muscle contract…

Q: If a muscle cell’s sarcoplasmic reticulum had little to no Ca2+, could the muscle cell still produce…

A: Ca2+ ions play an important role in muscle contraction by creating interactions between the…

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: Sketch a sarcomere, and describe the function of the major proteins involved in muscle contraction.

A:

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: Explain how the length of a muscle fiber at the time it is stimulated to contract affects the…

A: Introduction:- The functional unit of striated muscle is the sarcomere. This is the most fundamental…

Q: xplain Why can smooth muscles contract over a wider range of resting lengths than skeletal and…

A: Muscle cells only contract when they are stimulated. Muscular cells, also known as myocytes, make up…

Q: During which phase of the crossbridge cycle is ATP split into ADP and Pi? A. Immediately preceding…

A: Cross bridge cycling refers specifically to the action of the cross-bridge, that being the head and…

Q: During which phase of a twitch in a muscle fiber istension the greatest?a. resting phaseb.…

A: The phenomenon of lifting or moving an object (load) involves the sarcomeres present in the muscle…

Q: If a drug caused a sudden release of large amounts of calcium in skeletal muscle, from which…

A: Increases in intracellular calcium arises through either calcium influx across the plasma membrane…

Q: a. At what time point did would a nerve begin to fatigue? Comment on the percentage decrease in…

A: Introduction Muscle fatigue:- It is a decrease in maximal force or power production in response to…

Q: How would muscle contractions be affected if skeletalmuscle fibers did not have T-tubules?

A: Muscles:                    In animals, soft tissues found known as muscles. Muscles cells contain…

Q: A.What type of contractions do skeletal muscles do? B. What type of contractions do cardiac muscles…

A: Muscles are usually of three types that is Skeletal,smooth and cardiac  Skeletal muscles are found…

Q: In a essay describe in details response by a skeletal muscle and examples.

A: The body's muscular system, which comprises skeletal, smooth and cardiac muscles, allows body…

Q: Which type of myosin is found in contractile bundles?

A:

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: Which is true for striated muscles? a) may have spontaneous activity b) is not under the control…

A: Muscle are group of cells which perfom a specific function. They are responsible for movement. They…

Q: Draw the diagram of a sarcomere of skeletal muscle showing different regions.

A: Muscle is formed by skeletal muscle fiber and they contain cytoplasm with cellular structures such…

Q: Why would a sprinter experience muscle fatigue before a marathon runner would?

A: Muscles are required in breathing, talking, running, walking, and anybody movement. Actin and…

Q: How would muscle contractions be affected if ATP wascompletely depleted in a muscle fiber?

A: Myofibril is also referred to as muscle fibril. They are the rod-like constitutions of the muscle…

Q: 3. a. In tabulated form, compare and contrast the 3 types of muscle tissues according to structure…

A: The muscles tissues usually consists of the cells that expand and contract to produce movement in…

Q: What can you conclude about normal muscle contraction?

A: Muscle is a soft tissue that is found in most animals. Muscle cells contain protein filaments of…

Q: How is smooth muscle is different from skeletal muscle?a

A: Muscle tissue is defined as a soft tissue. It is one of the 4 fundamental types of tissue present in…

Q: How does the striated structure of skeletal muscle relate to its contractile function?

A: Muscle tissue is categorized into three types, skeletal muscle (aids in voluntary movement), smooth…

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: How would ine generate more muscle tension to pick up something heavy? Increase activation of motor…

A: The nervous system is one of the vital systems of a body. It is a system of nerves which carry…

Q: How is a muscle cell excited and why does it lead to a contraction in the muscle?

A: Excitation for Muscle Contraction:  ∙ Nerve impulse advances arrival of Neurotransmitter…

Q: investigate anabolic steroids and their use in sports. b. Determine how they affect skeletal muscle…

A: Steroids are the artificially made hormones, as a version of natural hormones.

Q: Fill in steps for mechanism of muscle contraction:

A: Step 1: COCKED POSITION:- At rest, myosin heads are bound to adenosine diphosphate and are said to…

Q: Explain the consequences if tendons were dense elastic connective tissue instead of dense…

A: The connective tissue help in support and connects from muscle to bone, muscle to muscle.

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.