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Is conducting stimulus strong enough to generate a nerve impulse?
Yes, a stimulus needs to reach a certain threshold level of strength in order to generate a nerve impulse. This threshold is required to depolarize the cell membrane and initiate the action potential. If the stimulus is not strong enough to reach this threshold, no nerve impulse will be generated.
What is an action potential refers to a?
An action potential refers to a rapid and temporary change in the electrical membrane potential of a neuron or muscle cell. It occurs when a stimulus causes sodium channels to open, allowing sodium ions to influx and depolarize the cell. If the depolarization reaches a certain threshold, it triggers a cascade of ion movements that propagate the signal along the cell. This process is essential for the transmission of nerve impulses and muscle contractions.
What position on the muscle cell where the nerve fibers connect?
The point where a nerve fiber connects to a muscle cell is known as the neuromuscular junction. This connection allows the nerve signal, or action potential, to be transmitted from the nerve to the muscle cell, triggering muscle contraction.
What ion determines the resting membrane potential of nerve and muscle?
The potassium ion (K+) plays a major role in determining the resting membrane potential of nerve and muscle cells. This is because these cells have a higher permeability to potassium ions than other ions, such as sodium ions. As a result, the movement of potassium ions out of the cell through potassium leak channels leads to the establishment and maintenance of the negative resting membrane potential.
What is sacrolemma?
The sarcolemma is the cell membrane of a muscle fiber. It surrounds and protects the muscle fiber and controls the movement of substances into and out of the cell. The sarcolemma plays a crucial role in muscle contraction and the transmission of nerve impulses to the muscle fiber.
how do nerve cells and muscle cells work?
Nerve cells and muscle cells are excitable. Their cell membrane can produce electrochemical impulses and conduct them along the membrane. In muscle cells, this electric phenomenon is also associated with the contraction of the cell. Thank you, regards (me).
Is conducting stimulus strong enough to generate a nerve impulse?
Yes, a stimulus needs to reach a certain threshold level of strength in order to generate a nerve impulse. This threshold is required to depolarize the cell membrane and initiate the action potential. If the stimulus is not strong enough to reach this threshold, no nerve impulse will be generated.
What is the electrical potential across the cell membrane of a nerve cell or muscle cell when the cell is not active?
The resting membrane potential of a nerve cell or muscle cell is typically around -70 millivolts. This electrical potential is maintained by the unequal distribution of ions across the cell membrane, with more negative ions inside the cell than outside. This resting potential is essential for the cell to respond to changes in its environment and generate electrical signals when needed.
Triggering of the muscle action potential occurs after?
depolarization of the cell membrane reaches a threshold level. This threshold is usually around -55mV. Once threshold is reached, voltage-gated sodium channels open, allowing sodium ions to rapidly enter the cell and generate an action potential.
What part of the muscle cell membrane contain acetylcholine receptors?
Acetylcholine receptors are located on the motor end plate of the muscle cell membrane. This specialized region is where the nerve cell communicates with the muscle cell, allowing for the initiation of muscle contraction in response to acetylcholine binding to its receptors.
Egg cell is best suited to nerve cell or muscle cell of hug cell?
nerve.
What is the significance of a negative membrane potential in cellular physiology?
A negative membrane potential in cellular physiology is important for various functions such as maintaining cell stability, regulating ion movement, and enabling nerve and muscle cell communication. It helps in controlling the flow of ions across the cell membrane, which is crucial for processes like cell signaling and muscle contraction.
Why does repetitive nerve stimulation result in decreased amplitude of the muscle contraction?
The destruction of ACh receptors makes skeletal muscle less responsive to nerve stimulation and more likely to prematurely fatigue. With fewer ACh receptors available to bind to ACh, the skeletal muscle cell membrane potentials have a more difficult time reaching the threshold potential and initiating contraction. Thus, the normal degree of fatigue noted during repetitive nerve stimulation is exacerbated in an individual with myasthenia gravis.
What would be least affected by defective receptor proteins on a cell membrane a homeostasis b muscle activity c nerve signals d diffusion?
c. Nerve signals. Defective receptor proteins on a cell membrane would least affect nerve signals because nerve signals are transmitted through action potentials along the nerve cell membrane and are less reliant on specific receptor proteins for signal transduction compared to other cellular processes like homeostasis, muscle activity, and diffusion.
What position on the muscle cell where the nerve fibers connect?
The point where a nerve fiber connects to a muscle cell is known as the neuromuscular junction. This connection allows the nerve signal, or action potential, to be transmitted from the nerve to the muscle cell, triggering muscle contraction.
What are the chemicals called that a nerve cell uses to communicate with another nerve cell or muscle cell?
Neurotransmitters
Animal cell examples?
Examples of animal cells include red blood cells, nerve cells, muscle cells, and skin cells. Each type of cell has a specific function in the body, such as carrying oxygen, transmitting signals, generating movement, and providing structure and protection.
