2) Painful Popping Noise at time of Injury: Sometimes when the knee is injured e.g. twisting awkwardly, there is a sudden, loud pop at the same time indicating damage to part of the knee. 3) Recurrent Painful Popping Noises not Caused by an Injury: Knee pain and popping can come on gradually with no obvious cause. If knee popping occurs without any associated pain, it is usually due to either gas bubbles building up inside the joint which burst, or ligaments/tendons snapping over the joint.
What part of a neuron was investigated in this activity? The Â±rigger zone was investgaÂ±ed. This is where Â±he axon hillock and Â±he inital segmenÂ± come Â±ogeÂ±her ACTIVITY 4: The Action Potential: Importance of Voltage-Gated Na_ Channels 1. What does TTX do to voltage-gated Na + channels?
Axon hillock. The axon hillock is a specialized part of the cell body (or soma) of a neuron that connects to the axon. The axon hillock is the last site in the soma where membrane potentials propagated from synaptic inputs are summated before being transmitted to the axon. For many years, it had been believed that the axon hillock was the usual site of action potential initiation.