Why does the peak of the compound action potential changes with different strength stimuli?

Q: Why does the CAP increase in size and duration with increasing stimulus strength? A: The CAP is the algebraic sum of all individual fibre action potentials of the nerve. As stimulus strength increases, we recruit more fibres, therefore more APs add up to produce a larger bell-shaped curve.

What is compound action potential?

A compound action potential (CAP) is a signal recorded from a nerve trunk made up of numerous axons. It is the result of summation of many action potentials from the individual axons in the nerve trunk.

What is the conduction velocity of frog sciatic nerve?

A comparison of regenerated and normal frog sciatic nerves showed a marked reduction in conduction velocity from 37.5 to 15.2 m/s with little change in the absolute refractory period. Changes in conduction velocity corresponded to a reduced mean axon caliber (4.8 versus 6.6 micron).

How does a compound action potential cap differ from a single action potential?

How does a CAP differ from a single action potential? The CAP is the sum of all action potentials. What is the cause of relative refractory period? The axon did not have enough time to recover and respond.

When the stimulus intensity is increased What changes?

Chemical Synaptic Transmission & Neurotransmitter Release

Question	Answer
When the stimulus intensity is increased, what changes: the number of synaptic vesicles released or the amount of neurotransmitter per vesicle?	The number os synaptic vesicles released increases when the stimulus intensity is increased.

How does stimulus strength affect action potential?

When the intensity of the stimulus is increased, the size of the action potential does not become larger. Rather, the frequency or the number of action potentials increases.

What is the velocity of frog?

The horizontal velocity of the frog is 0.93 meters per second.

How do you find the conduction velocity of an action potential?

The conduction velocity of the action potential is determined by measuring the distance traveled (length of the nerve in m) and dividing by the time (sec) taken to complete the reflex arc, also called the latency. Conduction velocity = distance (m)/time (sec). Measurement of distance is relatively straightforward.

Why does the stimulus intensity affect?

both “the stimulus intensity directly affects the amount the calcium entering the axon terminal.” and “the stimulus intensity proportionally affects the number of synaptic vesicles that discharge their contents into the synaptic cleft.”

Why does frequency of action potentials increase when the stimulus intensity increases?

Why does the frequency of action potentials increase when the stimulus intensity increases? Action potential can occur more frequently if there is a constant source of stimulation as long as the relative refractory period is reached.

What does it mean when the compound action potential is at a maximum?

The stimulus strength that just gives a response is termed a threshold stimulus; any stimulus of greater strength is suprathreshold. The strength that just gives the maximal response is a maximal stimulus; any strength greater is supramaximal. The response of the nerve is called the compound action potential.

Is a frog leaping a projectile?

Because the only force acting on the frog while it is in the air is gravity, it will behave as a projectile. This means that the frog’s path through the air will be curved. It will travel upwards, reaching a maximum vertical displacement, also known as its maximum altitude.

What factors affect nerve conduction velocity?

The reference values for nerve conduction velocity (NCV) and late responses for different nerves considerably vary in different group and type of population. Physiological factors such as age, temperature, height, and gender affect the NCV.

What affects conduction velocity of an action potential?

Conduction velocity is influenced by myelin sheath thickness and internode distance (i.e. the distance along the axon between the nodes of Ranvier) (Hursh, 1939), and both parameters are linearly related to axon diameter.

Which will best increase the conduction rate of action potentials?

Which will best increase the conduction rate of action potentials? Increase the diameter of the axon, increase the resistance of the axon membrane to ion leakage.

What is stimulus intensity?

Threshold: the minimum intensity of a stimulus that is required to produce a response from a sensory system.

When stimulus intensity is increased What changes?

How does stimulus intensity affect action potential?

What effect will the increased stimulus intensity?

4. Predict Question: What effect will the increased stimulus intensity have on the frequency of action potentials? Your answer: The frequency of action potentials will increase.