1)
NERVOUS SYSTEM - Two key organs of the nervous system are the brain and spinal cord.
RESPIRATORY SYSTEM - The lungs and the trachea are two key organs of the respiratory system.
CIRCULATORY SYSTEM - Key organs of the circulatory system include the heart and blood vessels.
SKELETAL SYSTEM - The bones and cartilage are two key components of the skeletal system.
IMMUNE SYSTEM - Key organs of the immune system are the thymus and the spleen.
2) White blood cells (WBCs) and red blood cells (RBCs) have different functions in the body. White blood cells are part of the immune system and play a crucial role in defending the body against infections and foreign invaders. They can identify and destroy pathogens such as bacteria and viruses. White blood cells are produced in the bone marrow and are present in the blood and lymphatic system.
On the other hand, red blood cells are responsible for carrying oxygen from the lungs to the body's tissues and removing carbon dioxide. They contain hemoglobin, a protein that binds to oxygen and gives blood its red color. Red blood cells are produced in the bone marrow and have a distinct disc shape to maximize their surface area for oxygen transport.
In summary, white blood cells are involved in the immune response and defense against pathogens, while red blood cells are essential for oxygen transport and carbon dioxide removal in the body.
