Muscle spindles are the sensory receptors that monitor the length of skeletal muscles. When the length of the hamstrings changes between standing and seated positions, which structure is responsible for adjusting the length of the intrafusal muscle fibers of the muscle spindle?   Group of answer choices beta motor neurons gamma motor neurons extrafusal fibers alpha motor neurons

Q: In the sliding filament model of muscle contraction, I bands contain     sacrcomeres.     thin…

A: The cytoskeletal proteins including actin filament or microfilament, microtubules and intermediate…

Q: Which of the following statements accurately describes the pattern of recruitment in a muscle when…

A: The contraction of muscle is responsible for the development of muscle movement. The generation of…

Q: depolarization of the transverse tubules (T-tubules) promote

A: Every cell in the body has a cell membrane which separate it from the external environment of the…

Q: How would you explain the following observation? When motor nerve fibers in the leg are severed, the…

A: Motor nerve fibres are responsible for carrying the impulses from the central nervous system to the…

Q: The power stroke in muscle contraction is the: Group of answer choices product of force and velocity…

A: The cells that make up muscle have the unique capacity to shorten or contract to cause movement of…

Q: Looking at this diagram explain the order of size dependent recruitment of motor units during muscle…

A: Car rental refers to the performance of additional vehicles to achieve increased contraction…

Q: Which protein is responsible for blocking the myosin binding site to actin, while the muscle is at…

A: Myosin and actin slides onto each and plays a major role in muscle contraction..

Q: During a single muscle twitch, the sarcomeres within a muscle contract maximally. How can you…

A: A contraction of muscle fibers generate when an action potential pass down the motor neurons. A…

Q: Calcium storing membranous network in muscle fibers Transmit the action potential to the interior of…

A: The motor neuron's axon receives an action potential.On the axon, the action potential opens…

Q: Motor neurons release what type of neurotransmitter onto the motor end plate of skeletal muscles?…

A: Motor neurons of the spinal rope are essential for the central nervous system (CNS) and interface…

Q: If the number of active cross bridges in skeletal muscle begins to decline although the rate of…

A: Option A: Fatigue

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: To demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm…

A: Ans - the correct answer for the above question is- A) Different motor units were contracting while…

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: The motor unit firing patterns are measured in a human hand muscle using an electromyography (EMG)…

A: The EMG pattern observed as the individual voluntarily attempts to make a low-level force of…

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: Select ALL that would INCREASE the strength of a muscle contraction: recruiting more slow-twitch…

A: Skeletal muscle cells are long and cylindrical, has voluntary control in action that is in under our…

Q: Given what you have learned from the first experiment, you prepare the other leg for a fresh…

A: Curare," which is a class of drugs that block nicotinic acetylcholine receptors (nAChRs) located on…

Q: The protein whose removal enables myosin to bind actin in smooth muscle is: (pick one from 1-5).…

A: Smooth muscle: Smooth muscle is present throughout the body, where it serves a variety of functions.…

Q: All the following are necessary for a skeletal muscle cell to full relax, except one. Which answer…

A: Muscle is a delicate tissue found in many creatures. Muscle cells contain protein fibers of actin…

Q: What is a motor unit?     A group of muscles that are all innervated from the same spinal level…

A: Nervous system is a type of body system which is involved in control as well as coordination . It…

Q: Describe the structures and functions of actin-based motor proteins, myosins.

A: Motor proteins are a class of proteins that are capable of converting chemical energy (usually from…

Q: Put these events that occur in skeletal muscle in the correct chronological sequence: 1. Activation…

A: The membrane potential on the T-tubule membrane is sensed by a protein called the dihydropyridine…

Q: How are motor neurons involved in muscle contractions? Select all that apply. The release of calcium…

A: It is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord and…

Q: Explain why the ratio of motor neurons to skeletal muscle fibers is greater in muscles that control…

A: A motor neuron is a neuron whose cell body is situated in the motor cortex, brainstem or the spinal…

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 one of the following statements is the best description of a motor unit?     A single…

A: Motor unit is defined as a single motor neuron and all of the muscle fibers it innervates.

Q: The following are the basic steps of a muscle contraction:               I.  Neurotransmitters bind…

A: Muscle tissue is responsible for movement. There are found three types of muscles: Skeletal,…