A human body is composed of trillions of
, of which there are about 200 different types with varying functions that help to carry out life processes.

Question

A human body is composed of trillions of 
, of which there are about 200 different types with varying functions that help to carry out life processes.

BlackTom AI · Accepted Answer

The human body is composed of trillions of cells, of which there are about 200 different types with varying functions that help to carry out life processes.

Relevant knowledge points: a cell is the basic structural and functional unit of all living organisms (cell theory). In multicellular organisms like humans, cells differentiate into specialized types (e.g., neurons, muscle cells, red blood cells, epithelial cells) to perform specific tasks. These cell types together enable life processes such as metabolism, growth, reproduction (at the cellular level), response to stimuli, and maintenance of homeostasis.

Step-by-step reasoning:
1. Read the sentence fragment: “A human body is composed of trillions of ____, of which there are about 200 different types…” The phrase “trillions of” indicates a very large number of individual units.
2. Match candidate terms to both parts of the sentence: the unit must exist in trillions in the body and have around 200 recognized distinct types.
3. Cells satisfy both conditions: the human body contains on the order of 10^13–10^14 cells (trillions) and biology recognizes roughly 200–300 distinct human cell types depending on classification.
4. Confirm function clause: “with varying functions that help to carry out life processes” directly describes specialized cells performing tasks (oxygen transport, signaling, contraction, protection, secretion).

Why “cells” is correct: cells are numerous, differentiated into many types, and are responsible for carrying out life processes. The plural fits grammatically and conceptually.

Why other words are incorrect: tissues and organs are fewer than 200 types; organelles are components inside cells and do not number “trillions” across the body in the same sense; molecules or atoms exist in far greater variety and number and are not typically described as “about 200 different types” in this biological context.

Conclusion: The correct fill-in is “cells,” which matches the provided answer.

A human body is composed of trillions of , of which there are about 200 different types with varying functions that help to carry out life processes.未知题型

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