Question

The circulatory system has several functions. Which of the following is NOT one of its functions? A. Removing immune cells from the body B. Transporting nutrients to help nourish the body C. Transporting oxygen through blood cells D. Removing waste products from the body

Answer 1

Removing waste products from the body. (d)

Answer 2

Answer:

The correct answer is: A. Removing immune cells from the body.

Explanation:

The system that is responsible for eliminating immune cells from the body is the immune system. The immune system is the body's natural defense against infections. Through a series of steps, your body fights and destroys invading infectious organisms before they cause damage. When your immune system is functioning properly, it protects you from infections that cause illness.

The immune system consists of a large number of different types of cells and proteins that can distinguish between normal and abnormal cellular components, as well as between 'own' and 'non-self.' For example, when a spine becomes stuck in the body, immune cells recognize the spine as a foreign object (eg 'not own') and attack it. The same happens in the case of bacteria, viruses or other organisms that can invade our bodies. A more subtle distinction between self and non-self exists when the immune system forces recognize cancer cells. These are recognized and attacked because they are different from the normal "own" from which they were derived.