Question 11

The process by which needed nutrients enter the bloodstream of an animal is called absorption.

Absorption refers to the process through which nutrients from digested food pass through the intestinal walls into the bloodstream of an animal. This is a vital function for ensuring that the body receives the necessary substances for energy and growth.

A) integration

Integration is not related to the process of nutrient uptake. Instead, it typically refers to the coordination of different systems or processes within an organism, rather than the specific mechanism by which nutrients enter the bloodstream.

B) assimilation

Assimilation describes the process of incorporating absorbed nutrients into the body's cells and tissues. While it is related to nutrient processing, it does not specifically refer to the initial entry of nutrients into the bloodstream, which is the focus of the question.

C) osmosis

Osmosis is the movement of water across a semipermeable membrane and is not directly related to the absorption of nutrients. While water absorption is important for overall nutrient transport, osmosis itself does not encompass the broader process of nutrient entry into the bloodstream.

D) absorption

Absorption is the correct answer as it specifically denotes the process whereby digested nutrients pass through the intestinal wall into the bloodstream. This is a crucial step in the digestion process, enabling the body to utilize essential nutrients.

Conclusion

Absorption is definitively the correct answer as it accurately describes the mechanism by which nutrients enter the bloodstream, a fundamental aspect of nutrition and metabolism in animals. The other options, while related to biological processes, do not specifically capture the essence of nutrient uptake into the circulatory system.