The Human Immune System and the Lymphatic System

The video tutorial explains the human immune system, focusing on the roles of various cells, organs, and systems. It details the types of white blood cells, including phagocytes, macrophages, and lymphocytes, and their functions in fighting pathogens. The circulatory and lymphatic systems are discussed in terms of their roles in transporting and storing white blood cells. Key structures in the lymphatic system, such as lymph nodes, tonsils, thymus gland, and spleen, are highlighted for their importance in immune response and blood filtration.

Which type of leukocyte is known for engulfing unwanted cells in a nonspecific manner?

• Phagocytes

• Platelets

• Lymphocytes

• Erythrocytes

What is the primary function of lymph nodes?

• To produce hormones

• To transport oxygen

• To filter lymph and store white blood cells

• To produce red blood cells

What happens to lymph nodes when the body is fighting an infection?

• They shrink and become less active

• They produce fewer white blood cells

• They become sore and swollen

• They stop filtering lymph

Which organ is responsible for removing worn-out red blood cells and other substances from the blood?

• Liver

• Tonsils

• Thymus gland

• Spleen

Which of the following is not a part of the lymphatic system?

• Kidneys

• Spleen

• Thymus gland

• Tonsils