WILL MARK BRAINIEST

Put the following steps of the sliding filament theory in the correct order.

1. action potential arrives at the axon terminal

2. sodium diffuses into the muscle fiber

3. myosin binds to the active site on actin

4. acetylcholine is released into the synaptic cleft

5. calcium binds to troponin

6. calcium released from the terminal cisternae of the sarcoplasmic reticulum

7. troponin/tropomyosin complex changes shape, opens active site on actin

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

digestion

it excretes wastes

well, i believe that the answer is 2. : 3