Your body cells use oxygen you breath to get energy from the foods you eat. The process is called "Cellular Respiration." This process or function consists of the cell using oxygen to break down sugars in the body. When the cell uses the oxygen to break down sugars, carbon-dioxide is produced and energy is released, thus producing the energy your body needs.
"Hemoglobin" is a protein with Red Blood cells (also referred to as RBC's) that are responsible for the transport of oxygen. The Cardiovascular System consists of the heart and vessels and may also be referred to as the vascular system or the circulatory system. The heart functions as a muscular pump that pushes blood through the vessels to all areas of the body and the vessels function to carry it back to the heart as well. Hence the name "circulatory."
The four postulates of the natural selection include. 1. individuals possessing particular traits are have higher likelihood of surviving and reproducing. 2. different individuals in a population have different traits 3.reproductive and survival rate vary with individuals in a given population. 4. some trait differences are inheritable.
In general, tumors occur when cells divide and grow excessively in the body. Normally, the body controls cell growth and division. New cells are created to replace older ones or to perform new functions.
Pilus are thread like structures which are present on the surface of the bacterial cell.
They are mainly responsible for attaching the bacterial cells to a substrate, for obtaining food or to an eukaryotic cell for the purpose of infection.
Pilus also mediate the process of conjugation in some bacterial cells.
Conjugation is a process by which genetic material or plasmids are transferred from one bacteria to another through a channel formed in between the two bacteria by the help of the pilus.
Pilus also helps the bacteria by preventing them from getting recognised by the immune cells in the host.
A defective pilus will affect all the above processes, resulting in death of the bacteria.
