Question

lo 2.1. what is the main function of white blood cells? to filter waste from the blood. to transport oxygen throughout the body. to regulate body temperature. to create and store hormones. to fight infections and foreign invaders.

Explanation:

White blood cells, or leukocytes, are a crucial part of the immune system. Their primary role is to identify, attack, and eliminate pathogens (such as bacteria, viruses, fungi) and foreign substances (like toxins) that enter the body. This helps protect the body from infections and diseases.

• Filtering waste from the blood is mainly the function of organs like the kidneys.
• Transporting oxygen is the job of red blood cells (erythrocytes) which contain hemoglobin.
• Regulating body temperature is a complex process involving the skin (for heat dissipation or retention), blood vessels (vasodilation/vasoconstriction), and the hypothalamus (the body's thermostat in the brain).
• Creating and storing hormones is the function of endocrine glands (e.g., thyroid gland, pituitary gland, etc.).

Answer:

To fight infections and foreign invaders.