Bacteria are in general ranges from 0.5 to 5µm (micrometer) in length. blood cells ranges from 7-12 µm. so blood cells are bigger than Bacterium.
Red blood cell
A white blood cell is the biggest then the anthrax bacterium then the influenza virus.Hope it helps! :)
Fish blood contains nuclei in each blood cell and are much larger than human blood.
Lysosomes contain digestive enzymes within a cell. When a white blood cell engulfs a bacterium, the lysosome will merge with the vesicle containing the bacterium and digest it.
Virus
An animal cell has a nucleus, membrane-bound organelles like mitochondria and endoplasmic reticulum, and typically larger in size compared to a bacterium cell. These components allow animal cells to perform more complex functions compared to bacterium cells.
If it had a larger life span
From independent status to codependent status to a symbiotic/parasitic relationship wherein the smaller bacterium was engulfed in the larger, eventually becoming what we know today as a mitochondria, an organelle in the body of a larger cell. Mitochondria are present in almost all human cells and provide energy for the cell.
A bacterium has a cell membrane, not a cell wall.
They are attacked by the cells lymphocytes
lymphocytes (a type of white blood cell) produce antibodies which will attach themselves to foreign particles. so a detected bacterium will have many antibodies surrounding it and stuck to it. antibodies which have attached themselves to the bacterium will send a signal to the phagocytes (another type of white blood cell) to come and 'eat'. so the phagocytes will engulf the bacterium, and secrete lysozyme (an enzyme which cuts up everything that comes into contact with it) to digest the bacterium, killing it. thank you for that :poopyloopy dark orbit.
A bacterium's cell membrane allows it to withstand fluctuations in temperature within the human body. This is necessary in order for the bacterium to survive in that environment.