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?
Most neurons have three basic parts: a cell body, multiple dendrites, and an axon. 1  The cell body contains the nucleus, which houses the genetic blueprint that directs and regulates the cellâs activities. 2  Dendrites are branch-like structures that extend from the cell body and collect information from other neurons.