Why do sciatic nerves produce compound action potential?
When a large stimulus is delivered to the nerve, many axons in the nerve respond and the recorded potential is the summation of these axons firing simultaneously. This potential is known as the compound action potential (CAP).
What is sciatic nerve in frog?
The sciatic nerve is a large bundle of many nerve fibers. The fibers come out between vertebrae at the caudal end of the vertebral column. The nerve of the frog is dissected from its origin at the spinal cord as 3-4 bundles of the sciatic plexus, all the way to the gastrocnemius muscle.
What does it mean when a maximal response of the nerve is reached?
compound action potential
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.
What is the relationship between stimulus strength and response amplitude in a single axon?
There is no relation between stimulus strength and response amplitude in a single axon.
What is the effect of cooling on the conduction velocity?
Since the ion channels take time to open to allow the ions to travel across the membrane, cooling a neuron causes the ion channels to open more slowly, causing a reduction in the speed of the action potential as it travels down the axon (a reduction in conduction velocity).
Which has the highest speed of nerve impulse?
Myelinated neurons have a high speed of nerve impulse as compared to non-myelinated neurons. Hence, the correct option is (A)-Medullated nerve.
Which type of nerve is most sensitive to hypoxia?
of the neurons on trigeminal nerve stimulation.
What is the relationship between stimulus strength and response?
The relationship between stimulus strength and response amplitude in a single axon represents an all-or-nothing response. When a stimulus is strong enough to evoke an action potential, it will be presented as a response that the action potential is present.
How is action potential elicited in the earthworm experiment recording?
(b) A body cross-section through the earthworm is shown. The nerve is located ventrally, close to the pin electrodes beneath the worm. In this situation, action potentials are elicited by electrical stimulation, using the same array of electrodes that is used for recording (Fig. 1a).
How does temperature affect speed of nerve impulse?
Temperature – The higher the temperature, the faster the speed. This increases the speed of propagation dramatically, so while nerve impulses in unmyelinated neurones have a maximum speed of around 1 m/s, in myelinated neurones they travel at 100 m/s.
