1, action potential duration APD refers to action potential duration, which is a medical concept, and the English abbreviation is APD (action potential duration).
2. Avalanche photodiode Avalanche photodiode refers to the photosensitive element used in laser communication. When a reverse bias is applied to the P-N junction of a photodiode made of silicon or germanium, the incident light will be absorbed by the P-N junction to form a photocurrent. Increasing the reverse bias will produce an avalanche phenomenon (that is, the photocurrent will increase exponentially), so this diode is called an avalanche photodiode.
3.APD battery APD battery in Germany was established on June 65438+1October 65438+1October 8, 2002. It is invested and constructed by Germany APD Electric Co., Ltd., with a registered capital of14.5 million yuan and an area of 62,500 square meters.
The company has successively passed ISO900 1 quality system certification, ISO 1400 1 environmental management system certification, OHSAS 1800 1 health and safety management system certification, and won the title of "China Excellent Foreign-invested Enterprise", and its products have successively obtained UL certification in the United States and VdS in Germany. Products meet the strict requirements of China ROHS directive.
Formation mechanism of APD;
1, threshold stimulation or suprathreshold stimulation increases the permeability of the membrane to Na+, and Na+ flows in along the concentration gradient and potential difference, which depolarizes the membrane and forms the rising branch of action potential.
2.Na+ channel is inactivated, K+ channel is opened, K+ flows out, and repolarization forms a downward branch of action potential.
3. The role of sodium pump is to pump Na+ entering the membrane out of the membrane, and at the same time pump excess K+ out of the membrane into the membrane to restore the ion distribution concentration before the excitement.