The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell.
purkinje fibers
No, depolarization is not the resting state of the P wave. Depolarization is the process where the heart muscle contracts in response to an electrical signal. The P wave represents atrial depolarization, the electrical activity that triggers the contraction of the atria in the heart.
A QRS wave is caused by the depolarization of the ventricles of the heart, which leads to the contraction of the ventricles and the pumping of blood out of the heart. The QRS complex represents the electrical activity associated with this depolarization.
Arterial depolarization occurs when action potentials are generated in the cardiac cells of the heart during the electrical conduction system, leading to the contraction of the heart muscle. This depolarization occurs as the electrical signal travels through the atria and then the ventricles, causing them to contract and pump blood.
The QRS complex corresponds to the depolarization of the ventricles in the heart. It represents the spread of the electrical signal that initiates the contraction of the ventricles. This is a critical step in the cardiac cycle that leads to the pumping of blood out of the heart.
The R wave in an electrocardiogram (ECG) represents the depolarization of the ventricles in the heart. It is a measure of the electrical activity during the contraction phase of the heart's pumping cycle.
Okay so an EKG show the electrical impulse that travels through the heart. What I mean is EKG don't show contraction. However the QRS complex represent ventricular depolarization, which signals ventricular contraction
No, depolarization refers to the change in electrical charge within a cell, specifically during the initiation of an action potential. Contraction refers to the shortening or tightening of muscle fibers, which is a separate physiological process that can be triggered by depolarization in muscle cells.
No, depolarization in the heart is not passed cell to cell in the same way as at the neuromuscular junction. In the heart, gap junctions allow for direct electrical coupling between adjacent cardiac muscle cells, allowing the depolarization signal to quickly spread from cell to cell. In the neuromuscular junction, depolarization is transmitted by the release of neurotransmitters across the synaptic cleft from a neuron to a muscle cell.
Calcium is the biggest one. Sodium is another. Calcium is important because it plays a key role in the heart's contraction and ventricular depolarization processes. Without enough calcium, the heart will not contract properly.
P wave
The PQRS wave represents the electrical activity in the atria of the heart during an electrocardiogram (ECG). The P-wave indicates atrial depolarization, which is the contraction of the atria.