Answer;
-Atrial contraction;
Explanation:
-The cardiac cycle comprises all of the physiological events associated with a single heartbeat, including electrical events, mechanical events (pressures and volumes), and heart sounds.The atria and ventricles alternately contract in each cardiac cycle. The pressures in the chambers change greatly over the course of the cardiac cycle.
-During atrial contraction, blood flows from atria (high pressure) to ventricles (low pressure). Similarly, this same pressure gradient exists during ventricular filling.
49; Number of Electrons = Number of Protons = Atomic Number
Electron Transport Chain located in the Mitochondria.
I don't see any answer options so that's my best guess
<span> your answer would be the Ramphastos bird. happy to help;)</span>
Answer:
Vitamin B12 can be made from genetically modified bacteria
