A research scientist is developing a new drug that blocks muscle cellreceptors that, when activated, stimulate a muscle contraction. In her firstexperiment, she used 250 mg of the new drug but saw no effect. In hersecond experiment, she increased the dosage to 750 mg. This dosagewas successful in blocking the muscle stimulation. Explain why increasingthe dosage would affect the outcome of the experiment.

Q: Most skeletal muscles contain which of the following? O fast twitch fibers O slow twitch fibers O…

A: * Skeletal muscle functions in voluntary actions hence called as voluntary muscle. *Skeletal muscles…

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: If implanted electrodes were used to stimulate action potentials in gamma motor neurons to flexors…

A: When gamma motor neurons are activated, the striated ends of a muscle fiber are stimulated, thus…

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: Which of the following choices best summarizes excitation-contraction coupling? A series of events…

A: Excitation contraction coupling is the process by which an electrical stimulus triggers the release…

Q: Why is the latent period longer during an isotonic twitch of a skeletalmuscle fiber than it is…

A: Muscle tissue is a well-vascularized soft tissue present in the muscles of an animal body. Muscle…

Q: The higher the frequency of action potentials, the higher amount of force produced in a muscle.…

A: An action potential is a change in the membrane potential of the neuron. This is caused due to…

Q: .The poison ouabain (wah-BAY-in), or arrow poison, blocks the Na+ K+pump. What effect would this…

A: Ouabain is also called the g-strophanthin. It is a toxic substance derived from a plant that was…

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: Why is it important to remove acetylcholine from its binding to acetylcholine receptors once the…

A: Neurotransmitters can serve as chemical messengers for ion channels, neurotransmitter mainly causes…

Q: Know the Sliding Filament Theory & neurological events leading up to contraction. (i.e. from the…

A: The level of calcium ions in the cytoplasm is controlled by muscle contraction. Calcium ions work at…

Q: Which of the following is responsible for muscle movement? A. Antagonists B. Isometric Contraction…

A: Q.1  Answer :-  Antagonist and agonist muscles often occur in pairs, called antagonistic pairs.…

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: If you introduced a chemical into a muscle fiber that blocked the voltage-gated calcium channels in…

A: The muscles are the soft tissues found in the animals. They are made up of special types of…

Q: Please describe when the myosin heads grab and pull on the active sites in the actin fibers

A: Muscle cells are specific for contraction. It allows for motions and facilitates bodily processes…

Q: The decrease in active force that occurs at lengths longer than the optimal length is caused by: O…

A: According to the question, the decrease in active force that occurs at lengths longer than the…

Q: The motor end plate is _ a folded area of muscle cell membrane a specialized protein on the…

A: Motor end plate  It a special type of synapse where motor axon touches to a targeted muscle cell.

Q: Savannah and her 59-year-old grandfather spent a long daygardening. Pulling weeds, raking, and…

A: However, Savannah’s grandfather was more stiff and sore, and it took him much longer to recover than…

Q: In order to excite a skeletal muscle, the neurotransmitter must bind to: a)calcium channels. b)…

A: Neurotransmitters such as acetylcholine bind to receptors on the muscle surface and elicit a…

Q: Number 5 in Graph B represents iand is the result of i The statement above is best completed by the…

A: Need to find what the label 5 represents in the graph given.

Q: Discharge from muscle spindles could be increased by all the following, except :-a- increased…

A: Muscle tissue is soft tissues that provide ability to contract. Cardiac muscle, skeletal muscle, and…

Q: The drug Botox prevents wrinkles by preventing muscles from contracting. Specifically, it prevents…

A: Botulinum toxin is a neurotoxic protein produced by the bacterium Clostridium botulinum.

Q: Which of the following is arranged in order from smallest tolargest?a. Motor unit < sarcomere…

A: When a nerve impulse travel to the muscle contraction that is an action potential causes the muscles…

Q: In the process called "excitation-contraction coupling" (the events that lead up to a muscle cell's…

A: When an organism is dead, there occurs stiffening of muscles. This is termed as Rigor mortis. This…

Q: ___________ steroids are designed to promote musclegrowth but have harmful side effects.

A: The muscular framework is an organ framework comprising of skeletal, smooth and cardiovascular…

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

A: TISSUE: These tissues differ from others in that they have the ability to contract and relax, which…

Q: If gene therapy in the future would allow one to artificlally alter the expression of muscle fibers…

A: Given: From the following, we need to arrange the slow-twitch fibers and fast-twitch fibers

Q: Stretch of an innervated muscle evokes :-a- contraction of its spindlesb- contraction of its…

A: The stretch reflex (myotatic reflex) is a monosynaptic reflex that controls the length of a skeletal…

Q: When you “max out” on reps or pushups or something like that, what kind of stimulus is your brain…

A: Exercise builds and strengthens muscles, which can protect the bones from injury, and support and…

Q: ___________ crosses the synapse between a motor neuron and a muscle fiber and is responsibile for…

A: Muscle Contraction It stimulates when an action potential moves along the nerves to the muscles. It…

Q: When curare, a neuromuscular poison, is dropped onto an isolated muscle-nerve preparation in a…

A: A normal physiology of Neuromuscular junction:nAChR are the type of acetylcholine receptor located…

Q: Describe how you bend your arm, starting with action potentials and ending with the contraction of a…

A: The bending of the arm is controlled by the action potential that generates and travels along the…

Q: Acetylcholinesterase is the enzyme that breaks down and inactivates acetylcholine. Some nerve gases…

A: Nerve gas binds to acetylcholinesterase enzyme but only at 1 site. Nerve gas has a phosphorus group…

Q: The rising phase of a muscle twitch represents ________. the time of relaxation of the muscle…

A: Muscle twitches are involuntary contractions of the muscle fibers. Nerves control these muscle…

Q: Please answer both questions.  At some point, increasing stimulus strength will not result in a…

A: In most animals, muscle is a soft tissue that is found. Muscle cells produce actin and myosin…

Q: Smooth muscle contraction is controlled by releasing neurotransmitters trom: Presynaptic cleft O…

A: Smooth muscle contraction is controlled by releasing neurotransmitters from:

Q: What effect does increasing the frequency of action potentials in a skeletal-muscle fiber have upon…

A: Skeletal muscles -- are the muscle which are in our voulantry control These  are attached to the…

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: 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 statements is true?a. Fast fibers have a small diameter.b. Fast fibers…

A: The skeletal muscle fibers are of 2 types: slow-twitch muscle fibers and fast-twitch muscle fibers.…

Q: Excitation-contraction coupling is the sequence of events that links the action potential to changes…

A: Skeletal muscles are attached to the bones by tendons, which produce all the movements of body…

Q: The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous…

A: The force exerted by the muscle is less than its maximum in a concentric contraction, and the muscle…

Q: Why does a person with muscles that have a higher percentage of slow fibers have greater endurance…

A: Skeletal muscles are made up of individual muscle fibers.There are two types of skeletal muscle…

Q: When you lift a heavy box, your muscles need to generate a stronger than average contraction. What…

A: Muscle contraction is the mechanism of tightening, shortening, or lengthening of muscles that occurs…

Q: Which of the following statements is/are TRUE regarding control of muscle? S1= A twitch results from…

A: Here i discuss about the muscles control.

Q: Muscle cells are stimulated by neurotransmitters released from the synaptic terminals of what…

A: ACTION POTENTIAL An action potential occurs when the membrane potential of a specific cell  rapidly…

Q: During muscle contraction, the cross-bridge detaches when ________.a. the myosin head binds to an…

A: Muscles can change their length in the response to a stimulus.

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.