Question

Which of the following components of blood fights infection?
A. White blood cells
B. Platelets
C. Red blood cells
D. All of these

Answer 1

Blood is a bodily fluid found in humans and other animals that carries metabolic waste products away from cells while also delivering essential chemicals such as nutrition and oxygen. It is made up of blood cells suspended in blood plasma in vertebrates.

Complete answer:
One of the most vital components of life is blood. Blood is found in almost every mammal with a circulatory system. Blood was thought to have evolved from a sort of cell that was responsible for phagocytosis and feeding from an evolutionary standpoint. Blood and the circulatory system have aided the evolution of increasingly sophisticated lifeforms over billions of years.
Plasma, blood cells, and platelets make up blood, which is a fluid connective tissue. It transports oxygen and nutrients to all of our cells and tissues as it circulates throughout our bodies. It accounts about 8% of our total body weight. A typical adult has about 5-6 litres of blood.
Blood is made up of cells known as created components of blood, as we've seen. In the body, these cells have their own tasks and responsibilities to perform. The following are the blood cells that circulate throughout the body:
Red blood cells (Erythrocytes): In humans, RBCs, also known as erythrocytes, are biconcave cells with no nucleus. RBCs contain hemoglobin, an iron-rich protein that gives blood its red color. The most abundant blood cells generated in bone marrow are RBCs. They are primarily responsible for transporting oxygen from and to numerous tissues and organs.
White blood cells (Leucocytes): Leukocytes are blood cells that are colorless. They are colorless due to the lack of haemoglobin. Granulocytes and agranulocytes are two types of granulocytes. WBCs are primarily involved in immunity and defense mechanisms. White blood cells, often known as leukocytes, are the blood components that are largely responsible for combating infection. Your immune system's main actors are white blood cells. They are produced in the bone marrow and are a component of the lymphatic system. White blood cells scour the blood and tissues of your body for foreign invaders (microbes) including bacteria, viruses, parasites, and fungus.
So, White blood cells fight infection

Thus , the correct answer is Option A: 'White blood cells.'

Note:
Anemia is a disorder in which your body's tissues don't get enough oxygen because you don't have enough healthy red blood cells. Anemia, commonly known as low hemoglobin, can leave you feeling exhausted and weak. Anemia comes in a variety of types, each with its unique etiology.