Time dilation is a phenomenon predicted by the theory of relativity, which states that time can be experienced differently for objects in different gravitational fields or moving at different speeds relative to each other. Time dilation occurs when the relative velocity between two observers or the strength of the gravitational field they are in differs significantly.
The effects of time dilation become noticeable when an object is moving at speeds close to the speed of light or when it is in a strong gravitational field, such as near a black hole. In these situations, time appears to pass slower for the moving or more gravitationally affected object compared to a stationary or less gravitationally affected object.
Now, let's address your question about biological processes within us. While it is true that our movement through space and time can cause time dilation, the effects of time dilation on biological processes within our bodies are negligible in everyday situations. This is because the speeds at which we move and the gravitational fields we are typically exposed to are not significant enough to produce noticeable time dilation effects.
The relative velocities of everyday objects, including our bodies, are much smaller compared to the speed of light. As a result, the time dilation experienced by biological processes within our bodies is incredibly small and practically negligible. It would require extremely high speeds, approaching the speed of light, for the effects of time dilation to become noticeable in our day-to-day lives.
Additionally, the gravitational field strength on Earth is relatively weak compared to what is required to produce significant time dilation. For example, near the surface of the Earth, the effects of gravity cause a minuscule time dilation compared to being near a black hole or in a highly curved spacetime region.
In summary, while time dilation is a real phenomenon, the relative speeds and gravitational fields we experience in our daily lives are not significant enough to produce noticeable time dilation effects on biological processes within our bodies. The effects of time dilation become significant only in extreme situations involving high speeds or strong gravitational fields.