Final answer:
High frequency of intense exercise can have a positive effect on white blood cells (WBCs). Exercise increases blood flow and oxygen delivery throughout the body, which can stimulate the production of WBCs and enhance their immune function.
Step-by-step explanation:
High frequency of intense exercise can have a positive effect on white blood cells (WBCs). Exercise increases blood flow and oxygen delivery throughout the body, which can stimulate the production of WBCs and enhance their immune function. Additionally, exercise can help to mobilize WBCs from the spleen, where they are stored, into the circulating blood, increasing their numbers. For example, studies have shown that regular exercise can increase the number of circulating natural killer (NK) cells, which are a type of WBC involved in immune surveillance and defense against tumors and viral infections. Exercise can also enhance the function of other types of WBCs, such as neutrophils and macrophages, which play a crucial role in fighting infections.