At what point during excitation contraction coupling does exocytosis play a role? Group of answer choices during acetylcholine release from the synaptic terminal during calcium ion reuptake into the sarcoplasmic reticulum when sodium channels open up on the motor end plate when ATP splits into ADP and P on the free myosin head when the action potential surges through the T-tubules

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

A: Muscle cells are specialized for contraction. Muscles allow for motions such as walking, and they…

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: A typical relaxed sarcomere is about 2.3 μm in length and contracts to about2 μm in length. Within…

A: The muscles fibers are composed of myofibrils and in turn myofibrils are composed of myosin and…

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: Actin filaments in microvilli require the help of myosin so that they can associate with the…

A:

Q: Given these events:(1) Acetylcholine is broken down into acetic acid and choline.(2) Acetylcholine…

A: Neurotransmitters are chemicals secreted by neurons that carry information from one neuron to the…

Q: How fast could a non-muscle cell make a contraction compared to a muscle cell if the relative rates…

A: In muscle contraction, actin filaments are associated with myosin filaments to perform various kinds…

Q: [ANIMAL PHYSIOLOGY] When an action potential from a motor neuron arrives at the neuromuscular…

A: ACTION POTENTIAL It is a rapid rise and subsequent fall in voltage or membrane potential across a…

Q: Neurons supplying smooth muscle secrete histamine display receptors only on the dendrites create…

A: Smooth muscle are cells that do not have striations. These muscles are present in the walls of…

Q: Action potential ente from adjacent cell. 1 Ca2+ 2 K* 3 Na* Ca2+ ЕCF ATP NCX ICF 3 Na* RyR Ca2+…

A: The muscle contraction of myocardial cells is activated with the help of specific stimulus that…

Q: Acetylcholine is necessary for the depolarization of skeletal muscle cells. Which of the following…

A: * Acetylcholine is an chemical that functions in brain and body as  neurotransmitter.  *It is an…

Q: What is the function of calcium in muscle contractions? to bind to troponin and change its…

A: Skeletal muscles are a special type of muscles made up of contractile tissue. They are a type of…

Q: Put these events in the correct chronological sequence: 1. End-plate potentials trigger action…

A: The contraction of the muscle is led by two conditions which include an increase in the muscle…

Q: Curare is a dangerous poison extract from plants that can block the binding site of Acetylcholine…

A: The conditions which likely to diminish or completely prevent tension production are 1. Reduced…

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: For relaxation to occur, A. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium…

A: The muscle contraction and relaxation are regulated by the concentration of calcium ions released…

Q: Which of these statements about the molecular structure of myofilaments is true?a. Tropomyosin has a…

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

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: Discuss ATP-driven myosin movement along actinfilaments.

A: The actin filament is linear globular actin polymer subunits. These occur as microfilaments in the…

Q: Myosin motor proteins are NOT involved in which of the following?

A: option a not involved Regulating the mitotic organizing center MTOCs  Option b involved because…

Q: Calcium ions are responsible for unmasking of active site on which protein for cross bridge activity…

A: The muscle fibers contain sarcomeres that are the structural units responsible for muscle…

Q: Describe the process of skeletal muscle contraction, beginning with an action potential in a motor…

A: Skeletal muscles are voluntarily controlled.

Q: The following list of events take place during a muscle contraction.  Place the events in…

A: Muscle contraction is tension generating site activation within the muscle fibers. The muscle…

Q: If ligand-gated K+ channels were to open in an unstimulated muscle fiber,how would this affect the…

A: The ligand-gated channels are those channels that open in response to the ligand which could be…

Q: Which statement or statements describe why depletion of ATP after death leads to rigor mortis?

A: Rigor mortis is the third phase of death. It is one of the unmistakable indications of death,…

Q: Briefly explain the steps involved in a single muscle contraction beginning at the neuromuscular…

A: Muscles are tissues that can contract and expand. The muscles can be grouped into three types based…

Q: Myosin's affinity for actin occurs Following the power stroke When myosin is energized When a new…

A: Myosin is a fibrous globulin of muscle. It split ATP and react with actin in muscle contraction.…

Q: The role of tropomyosin in a muscle cell is to ____. all to cell to relax by blocking the binding…

A: Tropomyosin is a protein which is involved in skeletal muscle contraction. all to cell to relax by…

Q: During the cross-bridge in muscle cells, myosin motors hydrolyzes ATP as a fuel to create a pulling…

A: Skeletal muscles are a special type of muscles made up of contractile tissue. They are a type of…

Q: In muscle cells, myosin molecules continue moving along actin molecules as long as: "A ATP is…

A: As per batleby guidelines we have to answer only first questions: You may repost rest of the…

Q: The release of calcium ions initiates muscle contractions.Watch this video…

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

Q: the

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

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: Put the steps of excitation-contraction in order: 1 Myosin "heads" pivot, cause [ Choose ] Calcium…

A: The mechanism of contraction of skeletal muscle was best explained through 'sliding filament…

Q: In myogenesis, the assembling sarcomeres are integrated with the extracellular matrix (composed of…

A: Myogenesis is the process of development of muscular tissue during embryogenic development.

Q: What is the role of calcium in muscle contractions? Multiple Choice   a) To spread the action…

A: Muscle contraction It is the activation of tension-generating regions in the muscle fibers. It…

Q: The depletion of ATP in muscle cells causes ____. myosin heads to remain bound to actin…

A: answer:1 The depletion of ATP in muscle cells causes calcium ions to be released from the…

Q: 51- are links between the Filamentous F-actin of thin filaments and myosin heads of thick filaments.…

A: Introduction Muscle contraction is the activation of tension-generating sites within muscle cells,…

Q: Which statement or statements describe the role of calcium in the stimulation of muscle fibers?…

A: Muscles are defined as soft tissue that can undergo contraction, movement production, and maintain…

Q: What are the steps of the sliding filament model? Select all that apply. Sarcomeres are in a relaxed…

A: Following are the steps of contraction of the disease 1. Release of neurotransmitter at motor…

Q: Actin exits in two forms, a globular G form ( the free subunit) and a filamentous Fform( assembled…

A: Answer: ACTIN = This is a protein that forms microfilaments and are present in all eukaryotic cells,…

Q: Please order the steps of myofilament movement. Myosin heads are "energized" by the presence of ADP…

A: The acting is a component of cytoskeleton protein. It is responsible for muscle contraction together…

Q: Arrange the steps in the correct order to explain how a muscle fiber contracts.   Myosin and actin…

A: The movement of muscles in the body in response to a stimulus is so quick that it is difficult to…

Q: skeletal muscle is packed with myofibrils consisting of a repeating chain of contractile units we…

A: Sarcomere shortens and then the muscle contract. Sarcomere is considered as the smallest unit of…

Q: Elevated levels of Pi in the sarcoplasm of skeletal muscle fibers would decrease the release of Pi…

A: Cross-bridge cycle is referred to as the phenomenon which involves the actin and the myosin…

Q: Smooth muscles relax when: a) myosin kinase phosphorylates the myosin head b) myosin phosphatase…

A: Smooth muscles relax when myosin phosphatase removes a phosphate group from myosin. (Option B is…

Q: In the presence of myosin cross-bridges are able to bind to complementary sites on the actin…

A: Every skeletal muscle is composed of my 5 deals full stop this my fibrils are composed of my…

Q: In order to form a cross bridge in skeletal muscle sarcomeres, calcium must bind to __________ and…

A: Calcium is required for muscle contraction. A muscle is made up of actin and myosin. Actin are…

Q: Which of the following proteins in the skeletal muscle myofiber anchors thick filaments to the Z…

A: Myofilaments are the filaments of myofibrils. The different arrangements of myofilaments lead to the…

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.