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Threshod is the amount of force or exertion that a muscle or nerve cell can withstand at the peak of stimulation. Extending over a threshold can lead to cell over-exertion and possible damage to the internal structures.
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What ion determines the resting membrane potential of nerve and muscle?
The concentrations on Na+ outside the cell and concentrations of K+ inside the cell determine the resting membrane potential.
Action potentials originate at the?
Action potentials are how nerve impulses are transmitted from neuron to neuron. An action potential is formed when a stimulus to the nerve cell causes the membrane to depolarize and open all of its sodium ion channels toward the threshold 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.
What is a cell membrane?
It is the outer layer of protection of the Cell. It controls what goes in and out of the Cell. It contains lipids, proteins, and phospholipids. It is very important because it protects the Cell from the environment.It is called a neurolemma if it is around a nerve cell, and a sarcolemma if it is around a muscle cell.cell mem·branenounthe semipermeable membrane surrounding the cytoplasm of a cell.hope this helps!
What happens to your acetylcholine when you stumble?
from answers.com When a nerve impulse reaches an axon ending, voltage-gated calcium channels in the axonal membrane open and calcium, which is extremely low inside the cell, enters the nerve ending. The increase in calcium-ion concentration causes hundreds of synaptic vesicles to fuse with the cell membrane and expel acetylcholine into the synaptic cleft (exocytosis). The acetylcholine released at a neuromuscular junction binds reversibly to acetylcholine receptors in the muscle end-plate membrane, a postsynaptic membrane that is separated from the nerve ending by a very short distance. The receptor is a cation channel which opens when two acetylcholine molecules are bound, allowing a sodium current to enter the muscle cell and depolarize the membrane. The resulting impulse indirectly causes the muscle to contract.
What is the electrical potential across the cell membrane of a nerve cell or muscle cell when the cell is not active?
resting potential
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).
What ion determines the resting membrane potential of nerve and muscle?
The concentrations on Na+ outside the cell and concentrations of K+ inside the cell determine the resting membrane potential.
Animal cell examples?
An animal cell is made of cell membrane, nucleus, cytoplasm, mitochondria and vacuole. and an example of animal cell is skin cell, nerve cell, muscle cell, blood cell or etc...
What are the General structural and functional differences between a nerve and smooth muscle cell?
The general structural and functional differences between a nerve cell and a smooth muscle cell are as follows. A nerve cell, controls the nervous system and automatic functions a smooth muscle cell is located in the smooth muscle where the nerve cell is.
Egg cell is best suited to nerve cell or muscle cell of hug cell?
nerve.
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 are the chemicals called that a nerve cell uses to communicate with another nerve cell or muscle cell?
Neurotransmitters
Action potentials originate at the?
Action potentials are how nerve impulses are transmitted from neuron to neuron. An action potential is formed when a stimulus to the nerve cell causes the membrane to depolarize and open all of its sodium ion channels toward the threshold 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.
What is depolarizing?
loss of polarization; especially : loss of the difference in charge between the inside and outside of the plasma membrane of a muscle or nerve cell due to a change in permeability and migration of sodium ions to the interior
What is a cell membrane?
It is the outer layer of protection of the Cell. It controls what goes in and out of the Cell. It contains lipids, proteins, and phospholipids. It is very important because it protects the Cell from the environment.It is called a neurolemma if it is around a nerve cell, and a sarcolemma if it is around a muscle cell.cell mem·branenounthe semipermeable membrane surrounding the cytoplasm of a cell.hope this helps!
