Curare is a paralyzing compound that blocks theaction of the neurotransmitter acetylcholine at the muscle fiber’smotor endplate. What effect do you think curare has on the releaseof calcium ions from the sarcoplasmic reticulum of the muscle cell?

Q: Which of the following summarizes the role of acetylcholinesterase in muscle contraction? O opens…

A: Acetylcholinesterase (AChE) is an enzyme that breaks down the neurotransmitter acetylcholine in the…

Q: Contrast the role of Ca2+in the contraction of a skeletalmuscle fiber and a smooth muscle cell.

A: Muscles are soft tissues present in most animals. They contain protein filaments called actin and…

Q: n order to study and understand muscle diseases, one needs to have a good understanding of normal…

A: Muscles contract in a repeated pattern of binding and releasing between the two thin and thick…

Q: Which of the following is NOT true regarding actin? O It contains troponin and tropomyosin O It is a…

A: Among the given options, option (d) is the most appropriate. All the mentioned statements are true…

Q: A nerve fiber,together with all of the muscle fibers it innervates, is called amotor unit. A motor…

A: The plasma membrane of a neuron can change its potential from a resting potential to an action…

Q: A motor unit is site of  interaction between a motor neuron and the muscle fiber that it is…

A: Neurons are the specialized cells of the nervous system and are the basic functional unit of the…

Q: How does the arrangement of myofilaments produce the characteristic striations of skeletal muscle…

A: Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth…

Q: Name the system that provides a ready supply of phosphocreatine to muscle cells and describe where…

A: Phosphocreatine It is also known as creatine phosphate. It is a phosphorylated form of creatine…

Q: 3) Paula is a scientist who is developing a drug called Fremtol that will be used to treat muscle…

A: ATP works as a cell energy currency and it helps the cell to rapidly accumulate energy and transfer…

Q: Even though calcium is removed from troponin and tropomyosin, please describe in detail what else…

A: The events that result in the contraction of human muscle fiber starts with the signal by a…

Q: Describe the sequence of events by which an action potential in a motor neuron produces an action…

A: Tendons attach skeletal muscles to the bone. Numerous bundles which make up the skeletal muscle are…

Q: e following are reg itch? (choose all that apply) e first phase where the "cross-bridge" c

A: The contraction of a muscle fiber in response to a stimulus by the nervous system is called as a…

Q: What happens to calcium ions when muscle contraction ends and relaxation begins? O The ions diffuse…

A: Muscle is one of the types of soft tissues present in human beings and many other animals, and these…

Q: What is the role of ATP and ATP hydrolysis in the cycle of actin-myosin association and…

A: ATP (adenosine triphosphate) and ATP hydrolysis play crucial roles in the cycle of actin-myosin…

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: 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: How do calcium ionsparticipate in musclecontraction? Why do bothmuscle contraction andmuscle…

A: Muscle contraction is the process of activating tension generating sites in the muscle fibers.…

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

A: Muscle contraction:-  Is the response  a muscle has to any kind of stimuli where the result is…

Q: Recently, it has been observed that several muscle diseases and disorders are linked to problems…

A: Some individuals with inherited genetic mutations are susceptible to malignant hyperthermia. Certain…

Q: In theory, could a muscle cell get away with having only acetylcholine-gated cation channels, which…

A: Voltage-gated ion channels are a crucial component of generating and propagating action potentials…

Q: Myofibis in muscle fibres are made up of repeating units of dark and light bonds called

A: Myofibril is a muscle cell that is shaped like a rod. Many chains of Myofibril bound together to…

Q: Why are calcium ions so important for the muscle contraction process

A: Muscle contraction is a process carried out by the interaction of the actin and myosin proteins. It…

Q: What is the difference between a myofilament and a myofibril?

A: The muscle is a soft tissue that is highly specialized in creating stress, resulting in strength…

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: 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: What effect does increasing the frequency of action potentials in askeletal muscle fiber have upon…

A: With alternative arrangements of light and dark band, skeletal muscles are striated muscles. They…

Q: If a single twitch of a skeletal muscle fiber lasts 40 msec, what action potential stimulation…

A: In human physiology, skeletal muscle is defined as the vital organ of muscular system which is also…

Q: Skeletal muscle cells undergo contractions based on a molecular mechanism involving: 1)the sliding…

A: The skeletal muscle cells contract by using myosin and actin filaments. These cells are accountable…

Q: hypoventilation builds up carbon dioxide in the body which causes respiratory acidosis. This would…

A: “Hypoventilation” is a state that occurs when there is inadequate ventilation. The amount of oxygen…

Q: Calcium is the trigger for contraction of all muscle types. How does its binding site differ in…

A: In the human body, there are three types of muscles, skeletal muscles, cardiac muscles, and smooth…

Q: Describe the sequence of events that occurs when an action potential arrives at a muscle fiber’s…

A: When the action potential arrives at the end of motor neurons, it excites the skeletal muscles to…

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: A motor unit associated with the stimulation of skeletal muscle is designated as a 1:8 motor unit.…

A: A motor unit is made up of a motor neuron and the skeletal muscle fibres innervated by that motor…

Q: In the absence of _____, a contracted skeletal muscle will not relax but will develop rigor mortis…

A: Introduction After the death of an individual, several changes take place inside the dead body. The…

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: Why calcium is important in skeletal muscle contraction?

A: All muscle filaments use Calcium ion (Ca2+) as their fundamental regulatory and signalling molecule.…

Q: Experimenters can separate F-actin thin myofilaments frommyosin thick myofilaments. First they…

A: Muscle tissues can change their length in response to the stimulus.

Q: What happens after Na+ and K+ rush into and out the muscle cell at the neuromuscular junction (NMJ),…

A: Neuromuscular Junction is the junction between the terminal branch of the nerve fiber and the muscle…

Q: List five proteins of the myofilaments and describe theirphysical arrangement.

A: Muscles are the soft tissue found in our body. Muscles work to create strength and movement. They…

Q: Where would you expect to find the greatest concentration of calcium in resting skeletal muscle ?

A: The human and other vertebrates contain three important muscle types, such as skeletal muscle,…