Q: Describe the structure of a sarcomere. What is its function?
A: Muscles are a group of tissues that contract together to produce a force. It consists of fibers of…
Q: Why is Excitation Contraction Coupling important?
A: Muscles contraction The contraction of muscle activated by the tension generating sites present in…
Q: Name, and describe the function of each of the contractile and structural protein components of a…
A: Sarcomere is the functional unit of the skeletal muscles comprising of alternate light and dark…
Q: Write the difference between Actin and Myosin.
A: The muscles are made up of proteins called as actin and myosin. These two proteins are involved in…
Q: The specialized post-synaptic portion of a neuromuscular junction is called a pick one: motor…
A: Individual motor units, each of which contains a single motor neuron and all the muscle fibers it…
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: Label the structures of the myofibril model shown with overlying sarcoplasmic reticulum. Transverse…
A: Muscular system is a type of body system which is involved in contraction and relaxation so as to…
Q: Describe the role of a presynaptic terminal, synaptic vesicles,synaptic cleft, and acetylcholine in…
A: The nervous system consists of the brain, spinal cord and neurons. The parts of a neuron are…
Q: Discuss how the concept of cell-to-cell communication applies to the neuromuscular junction
A: An ordinary person's daily schedule is jam-packed with activities such as walking, running, writing,…
Q: What molecule "couples" the action potential to the concentration cycle of the sarcomere? What does…
A: Muscle contraction is a major phenomenon associated with the functioning of the myofibril occurring…
Q: Compare and contrast the transmission of electrical activity at aneuromuscular junction with that at…
A: Neurons are responsible for the electromagnetic conduction of the signals in the form of stimulus.…
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: Describe the basic structure of a sarcomere.
A: Muscle fibres are made up of two protein filaments known as Myosin filaments which are thicker and…
Q: Define neurofilament
A: The intermediate filaments (IFs) are the components of the structural framework of the cells. These…
Q: Which of the following statements are true with regards to the differences between a neuromuscular…
A: The following statements are true with regards to the differences between a neuromuscular junction…
Q: Describe the structure of the sarcomere
A: The Sarcomere is a large protein unit that is essential for contraction in the muscle. Both skeletal…
Q: Put the following events in chronological order. (Some of the steps may be missing.) 1) Ca*+ floods…
A: Synapse is a meeting point in which one neuron is in contact with other neuron so that messages are…
Q: Is the resting membrane potential the bases of conduction in nerves and muscle fibers and the…
A: Membrane potential is the difference in the electric potential between the internal and the external…
Q: Neurotransmitters, the chemicals used in signaling across synapses, can be either re-absorbed by the…
A: Neurotransmitters can serve as chemical messengers for ion channels, neurotransmitter mainly causes…
Q: hen an action potential arrives at the nerve terminal of a neuromuscular junction, which of the…
A: An action potential is a brief electrical signal that travels along the membrane of a neuron or…
Q: From the following choices, choose the THREE, that would result in prevention of muscle contraction…
A: A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles.…
Q: the following structure will carry efferent impulses from central nervous system to skeletal muscles…
A: The image shown above represents the cross-sectional view of the spinal cord, an integral part of…
Q: Describe the structure of actin and myosin, including any accessory proteins.
A: Walking, running, writing, typing, and other activities are all part of the ordinary person's daily…
Q: Regardless of type, all neurons transfer signals between each other or to effectors (muscles or…
A: Synaptic transmission occurs between the presynaptic neuron and the postsynaptic neuron with the…
Q: Describe the Neuronal Excitation Contraction Coupling and Describe the role of calcium as the…
A: The nervous system and the muscles are connected to facilitate movements. The muscle cell or muscle…
Q: When an action potential arrives at the neuromuscular junction, acetylcholine is released into the…
A: Muscle is the tissue present in the body that helps for movement and change shape. There are mainly…
Q: The axon of neurons contains microtubules with the minus end situated toward the cell body and the…
A: We have different cytoskeletal fragments which helps in movement of substance inside the cells .
Q: The condition hyponatremia (hy′-poh-nah-TREE-mee-ah) is characterized by low levels of sodium ions…
A: Excitation of skeletal muscle membrane by action potential depends on ionic composition of blood and…
Q: Explain IN DETAIL the processes of synaptic transmission and summation, including the roles of…
A: Neurotransmitters Cemical messengers that your body requires to function. They are responsible for…
Q: Synaptic cleft has what?
A: Neurotransmitters are chemical substances that are released to mediate cellular communication. These…
Q: Caffeine is known to alter transmembrane movement of calcium. What are two possible sites in the…
A: Introduction Both calmodulin, a protein activator of cyclic nucleotide phosphodiesterase isolated…
Q: Please fill in the blanks: A(n) ["action potential", "muscle twitch", "contraction"] consists…
A: Muscles show all or none principle. i.e., a minimum strength of the stimulus is required for maximum…
Q: Define and
A: The main contractile unit of muscle fiber in the skeletal muscle is known as the sarcomere. Two main…
Q: Define the structure of a sarcomere.
A: The skeletal muscle is one of the three muscles present in the human body. It consists of series of…
Please describe the connection between neurotransmitters and sarcomeres
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- Please fill in the blanks: A(n) ["action potential", "muscle twitch", "contraction"] consists of a wave of depolarization that moves along the plasma membrane of a neuron or a muscle fiber. This wave of depolarization is immediately followed by repolarization. Depolarization is when the cell's membrane potential becomes more ["resting", "negative", "positive"] . Depolarization occurs when calcium channels open in the plasma membrane. Repolarization is when the cell's membrane potential becomes more ["resting", "positive", "negative"] , returning the cell to its resting potential. Repolarization occurs when ["calcium", "sodium", "potassium"] channels close and ["sodium", "calcium", "potassium"] channels open.Curare is a dangerous poison extract from plants that can block the binding site of Acetylcholine receptor channels in neuromuscular junctions. Which of the following molecular events will curare directly inhibit or prevent from occurring? Action potential traveling down the sarcoplasmic reticulum End-plate potential forming Release of calcium ions from the sarcoplasmic reticulum Release of Acetylcholine from axon terminalsPut these events in the correct chronological sequence: 1. End-plate potentials trigger action potentials. 2. Transverse tubules convey potentials into the interior of the cell. 3. Acetylcholine binds to receptors on the motor end plate. 4. Binding sites on actin are uncovered, allowing myosin to bind and carry out power strokes. 5. Ca2+ is released from the sarcoplasmic reticulum. 6. Chemically regulated ion channels open, causing depolarization. 7. Ca2+ ions bind to troponin-C, pulling on tropomyosin. A) 5, 3, 2, 1, 4, 7,6 B) 3, 6, 1, 2, 5, 7, 4 C) 4, 1, 3, 7, 2, 6, 5 D) 2, 4, 7, 6, 3, 1, 5 E) 3, 6, 1, 5, 7, 2, 4
- The condition hyponatremia (hy′-poh-nah-TREE-mee-ah) is characterized by low levels of sodium ions in the blood and extracellular fluid. What do you think would happen to the action potential in the sarcolemma if there were insufficient sodium ions in the extracellular fluid? (Hint: Think about what will happen to the normal gradient of sodium ions in hyponatremia.)Compare and contrast the transmission of electrical activity at aneuromuscular junction with that at a synapse?Describe the structure of actin and myosin, including any accessory proteins.
- Is the resting membrane potential the bases of conduction in nerves and muscle fibers and the presecutors of contraction in muscles?Put the following events in chronological order. (Some of the steps may be missing.)1) Ca*+ floods into the pre-synaptic neuron.2) ch (Acetylcholine) binds to ACh receptors in the sarcolemma.3) Na+ floods into the post-synaptic muscle cell.4) The A.P arrives at the pre-synaptic terminal causing Ca+ channels to open.5) Ach from the synaptic vesicles spills into the pre-synaptic cleft.6) A post-synaptic action potential results in the muscle fiber (depolarizationWhen an action potential arrives at the neuromuscular junction, acetylcholine is released into the synaptic cleft and binds to receptors in the postsynaptic membrane. Which of the following represents the correct order of the next series of events? A. An action potential travels down the T tubules, depolarization spreads through the T tubules, Ca2+ is released from the sarcoplasmic reticulum, and myosin binds to actin. B. Ca2+ is released from the sarcoplasmic reticulum, an action potential travels down the T tubules, depolarization spreads through the T tubules, and myosin binds to actin. C. An action potential travels down the T tubules, depolarization spreads through the T tubules, Ca2+ is taken up by the sarcoplasmic reticulum, and myosin binds to actin. D. T tubules are depolarized, Ca2+ is released from the sarcoplasmic reticulum, an action potential is created in the muscle cell, and myosin bonds to actin. E. An action potential travels…
- From the following choices, choose the THREE, that would result in prevention of muscle contraction (in other words, which three descriptive changes below would result in flaccid paralysis of a muscle). exocytosis of acetylcholine is constant, even without action potential injection of botulinum toxin calcium cannot be pumped back into the terminal cisternae acetylcholine receptor remains open to sodium active sites on actin a permanently exposed dramatically increase the activity of acetylcholinesterase calcium cannot bind troponinhen an action potential arrives at the nerve terminal of a neuromuscular junction, which of the following statements best describes the events that occur? Depolarisation of the nerve terminal causes the release of ACh which activates nicotinic receptors on the skeletal muscle membrane to cause Ca2+ entry and muscle contraction. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which activates voltage-gated Na+ channels at the end-plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which binds to muscarinic receptors at the end plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores…Which of the following statements are true with regards to the differences between a neuromuscular junction, and a standard central nervous system (CNS) synapse? Select all that apply. O The neuromuscular junction is a synapse between a neuron (alpha motor neuron) and a muscle fibre. CNS synapses connect two neurons. The graded potential generated by a neuromuscular junction has a much larger voltage than that of a CNS synapse. The structure of the neuromuscular junction ensures that an action potential in the alpha motor neuron always results in an action potential in the post-synaptic muscle fibre. CNS synapses do not guarantee this. The neuromuscular junction always uses Acetylcholine as a neurotransmitter, whereas CNS synapses may use a variety of neurotransmitters depending on their location and function
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