During a cardiac arrest, or heart attack, blood flow to a person’s heart muscles gets cut off. Why is this such a huge problem? In your response: - Identify which substances the blood carries.
- Explain why those substances are necessary for the survival of the organism.
- Identify the process used to create energy in the body.
- Identify the cell structure that does this process.

Why can cancer in the lymph nodes (lymphoma) be particularly dangerous? a. the lymph node's ability to produce cancer-fighting lymphocytes would be compromised. b. the lymph node's ability to produce cancer-fighting lymph would be compromised. c. the lymph nodes produce lymph, which nourishes growing cancer cells. d. the lymph nodes produce chyle, which nourishes growing cancer cells.