Question

by filtering blood and removing toxins.

1. at which level of body organization are nutrients directly absorbed from the bloodstream?

organ
organism
cell
tissue

Explanation:

To determine the level of body organization where nutrients are directly absorbed from the bloodstream, we analyze each option:

• Organ: An organ is a group of tissues working together (e.g., the liver or heart). Organs do not directly absorb nutrients from the blood; they use nutrients delivered by the blood.
• Organism: The organism level refers to the entire living being (e.g., a human). Nutrient absorption is not a process that occurs at the whole - organism level in the context of direct absorption from the bloodstream.
• Cell: Cells are the basic unit of life. Cells have structures (like cell membranes) that allow them to take in nutrients directly from the surrounding fluid, which in the case of cells in the body, can be the fluid derived from the bloodstream. For example, cells in tissues like muscle or nerve cells take up glucose, amino acids, etc., directly from the interstitial fluid that is in contact with the bloodstream.
• Tissue: A tissue is a group of similar cells working together (e.g., muscle tissue or epithelial tissue). Tissues themselves do not directly absorb nutrients from the bloodstream; it is the individual cells within the tissue that absorb nutrients.

So, the level of body organization where nutrients are directly absorbed from the bloodstream is the cell level.

Answer:

C. cell