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Why is the threshold voltage for nerve lower than the threshold voltage for muscle?
assignment sa physiology ceu? XD
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Why is the threshold voltage for nerve lower than the threshold voltage for muscles?
The threshold voltage for nerves is lower than for muscles because nerves rely on smaller ion channels that open more easily, allowing for faster nerve conduction. In contrast, muscle cells have larger ion channels that require a higher voltage to open, resulting in a higher threshold voltage for muscle activation.
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 ability of nerve and muscle cells to produce changes in membrane voltage?
The ability of nerve and muscle cells to produce changes in membrane voltage is known as excitability. This property allows these cells to generate and propagate electrical signals, which are essential for processes such as nerve signaling and muscle contraction.
Which nerve supplies teres major muscle?
The teres major muscle is innervated by the lower subscapular nerve, which arises from the posterior cord of the brachial plexus (C5-C8).
What does threshold mean in a muscle or nerve cell membrane?
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.
Why is the amplitude of the compound action potential recorded from the frog sciatic nerve increased when the voltage of the stimulus was increased above the threshold value?
Increasing the stimulus voltage above the threshold value results in recruiting more nerve fibers to generate action potentials. This leads to a greater number of action potentials being generated simultaneously along the nerve, resulting in a larger compound action potential amplitude being recorded.
Is an action potential fired in response to any nerve stimulus?
No, there must be a sufficient voltage summed up from all the inputs to be at or above the trigger voltage. Usually a single input is not sufficient.
What is the effect of increasing the foltage and how does this change correlate to changes in the nerve?
Increasing the voltage in a nerve can lead to an increased rate of nerve firing, resulting in more frequent action potentials. This can affect the overall excitability and sensitivity of the nerve. As voltage increases, the threshold for eliciting an action potential decreases, making the nerve more likely to fire in response to stimuli.
What is the all none law of muscle response?
all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will give a complete response or otherwise no response at all
How would the relationship between the stimulus voltage and the amplitude of the response differ on a single nerve fiber?
The relationship between stimulus voltage and response amplitude on a single nerve fiber follows the all-or-nothing principle. Below a certain threshold voltage, there will be no response. Once the threshold is reached, there will be a maximal response amplitude without variation with higher stimulus voltage.
Why does the nerve action potential increase slightly when you add 1.0 V to the threshold voltage and stimulate nerve?
The action potential increases slightly because more neurons are being stimulated.
What muscle and nerve will you need to isolate to study the physiology of nerve fibers?
To study the physiology of nerve fibers, you would need to isolate a specific muscle and the nerve innervating that muscle. This allows for the investigation of the interaction between the nerve and muscle, observing the transmission of signals and studying the response of the muscle to nerve stimulation. Commonly studied muscles and nerves in this context include the gastrocnemius muscle and the sciatic nerve in animal models.
