The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle..
Also asked, which neurotransmitter stimulates skeletal muscle cells to contract but slows?
Acetylcholine
Likewise, what causes a muscle cell to contract quizlet? The nerve impulse causes acetylcholine (chemical messenger) to cross the neuromuscular junction and stimulate the muscle cell to contract. What is a motor unit? Muscle contraction results in the shortening of sarcomeres when myosin binds to actin and slide past one another.
Just so, what event directly triggers the release of neurotransmitter?
Acetylcholine (ACh) is a neurotransmitter released by motor neurons that binds to receptors in the motor end plate. Neurotransmitter release occurs when an action potential travels down the motor neuron's axon, resulting in altered permeability of the synaptic terminal membrane and an influx of calcium.
What initiates an action potential on a muscle cell?
The electrochemical gradient across the muscle plasma membrane (more sodium moves in than potassium out) causes a local depolarization of the motor end-plate. This depolarization initiates an action potential on the muscle fiber cell membrane (sarcolemma) that travels across the surface of the muscle fiber.
Related Question Answers
Where are glial cells found?
Glia, also called glial cells or neuroglia, are non-neuronal cells in the central nervous system (brain and spinal cord) and the peripheral nervous system that do not produce electrical impulses. They maintain homeostasis, form myelin, and provide support and protection for neurons.Which technique studies the brain involves radioactive glucose?
Positron Emission Tomography (PET
What ion triggers the binding of actin and myosin?
calcium
What technique analyzes blood oxygen levels to look at the functioning of the brain?
Functional magnetic resonance imaging (fMRI
Which part of the neuron is responsible for maintaining the life of the cell?
Ch 2 Psychology Terms and Definitions
| Question | Answer |
| Dendrites | Branch-like structures that receive messages from other neurons |
| Soma | The cell body of the neuron, responsible for maintaining the life of the cell |
| Axon | Long tube-like structure that carries the neural message to other cells |
When a neuron is in the resting potential state?
The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.What insulates and protects a neuron axon as well as it helps to speed along electrical impulses?
The myelin sheath insulates and protects a neuron's axon, as well as helps to speed along electrical impulses. When a neuron is in the resting potential state, the neuron is negatively charged on the inside and positively charged on the outside.When a neuron's resting potential is occurring?
1. When a neuron is at rest, the neuron maintains an electrical polarization(i.e., a negative electrical potential exists inside the neuron's membrane with respect to the outside). This difference in electrical potential or voltage is known as the resting potential. At rest, this potential is around -70mV.Which type of muscle Cannot contract without being stimulated by the nervous system?
SMOOTH MUSCLES
What is the most distinguishing characteristic of muscle tissue?
What is the most distinguishing characteristic of muscle tissue? Its ability to transform chemical energy into mechanical energy. 3 discrete types of muscle fibers are identified based on size, speed, and endurance.Which organelle can chemically regulate the shortening of the muscle?
Skeletal Muscle Function The sarcoplasmic reticulum functions in the uptake, storage, and release of calcium ions to regulate the concentration of calcium ions in the aqueous sarcoplasm bathing the myofilaments and other organelles.What is the role of tropomyosin in skeletal muscles?
Tropomyosin is a protein involved in skeletal muscle contraction and that wraps around actin and prevents myosin from grabbing it. The calcium activates the troponin complex, which moves tropomyosin, and the muscle cell can contract.What event directly triggers the release of neurotransmitter shown in a summary of events at a neuromuscular synapse?
Summary of events at a neuromuscular synapse. >diffusion of Ca2+ into the axon terminal. A nerve impulse arrives at the axon terminal triggering the opening of Ca2+ channels, which allows for the diffusion of Ca2+ into the terminal. This in turn leads directly to the release of neurotransmitters by exocytosis.What does the CNS use to determine the strength of a stimulus?
The trick that the nervous system uses is that the strength of the stimulus is coded into the frequency of the action potentials that are generated. Thus, the stronger the stimulus, the higher the frequency at which action potentials are generated (see Figs.Why are calcium ions necessary for skeletal muscle contraction?
Why are calcium ions necessary for skeletal muscle contraction? Calcium ions trigger the binding of myosin heads to actin filaments.What is the functional role of the T tubules?
The function of T-TUBULES is to conduct impulses from the surface of the cell (SARCOLEMMA) down into the cell and, specifically, to another structure in the cell called the SARCOPLASMIC RETICULUM. The SARCOPLASMIC RETICULUM (SR) is a bit like the endoplasmic reticulum of other cells, e.g., it's hollow.What is the smallest contractile unit of a muscle?
From each Z-line to the next is a unit called the sarcomere. The sarcomere is the smallest contractile unit in the myofibril. Sarcomeres contract because the Z-lines move closer together. As the sarcomeres contract the myofibrils contract.What causes skeletal muscle cells to contract?
A single motor neuron is able to innervate multiple muscle fibers, thereby causing the fibers to contract at the same time. Once innervated, the protein filaments within each skeletal muscle fiber slide past each other to produce a contraction, which is explained by the sliding filament theory.What happens when a skeletal muscle contracts?
When signaled by a motor neuron, a skeletal muscle fiber contracts as the thin filaments are pulled and then slide past the thick filaments within the fiber's sarcomeres. The Sliding Filament Model of Muscle Contraction. When a sarcomere contracts, the Z lines move closer together, and the I band becomes smaller. 
