The Building Blocks
These are the smallest units of organization in the human body mentioned in the document.
What are atoms?
This sac-like organelle stores water, food, or other materials needed by the cell.
What is a vacuole?
This is a group of similar, specialized cells that perform the same function.
What is a tissue?
This rigid supporting layer surrounds plant cells but is NOT found in animal cells.
What is the cell wall?
Often called the "powerhouse" of the cell, these convert energy from food into energy the cell can use.
What are mitochondria?
These are organisms made of only one single cell.
What are unicellular organisms?
This organelle captures energy from sunlight and changes it into a form of energy the cell can use.
What is a chloroplast?
This level of organization is a body structure composed of different tissues working together.
What is an organ?
While both types of cells have these for storage, plant cells usually have one very large central one.
What is a vacuole?
This large oval organelle acts as the control center and contains the cell's genetic material (DNA).
What is the nucleus?
These are larger structures made when two or more atoms combine.
What are molecules?
These organelles contain substances that break down large food particles into smaller ones.
What are lysosomes?
This is the basic unit of structure and function in all living things.
What is a cell?
Because animal cells do not make their own food from sunlight, they lack this green organelle.
What is a chloroplast?
The cell membrane is "selectively permeable," which means it does this.
What is controlling which substances pass into and out of the cell?
This term describes the ranked order of organization from small to large (e.g., cells to tissues to organs).
What is a hierarchy?
This is the clear, gel-like fluid that fills the region between the cell membrane and the nucleus.
What is cytoplasm?
This is the highest level of organization representing the entire living thing made of all the systems working together.
What is an organism?
While animal cells use these organelles to break down food and old cell parts, they are rarely found in plant cells because plants usually use their vacuole for waste.
What are lysosomes?
This term refers to the maintenance of a stable internal environment within a cell or organism.
What is homeostasis?
Multicellular organisms are more complex than unicellular ones because they are composed of different types of cells with different ________.
What are functions?
This organelle is a network that processes many substances, including proteins and lipids (fats).
What is the endoplasmic reticulum (ER)?
This is a group of organs that work together to perform major body functions.
What is an organ system?
This is the thin, flexible barrier that is the outermost layer of an animal cell.
What is the cell membrane?
Different organ systems work together to help the body maintain homeostasis; name three major systems listed in the text.
What are (any three): digestive, respiratory, circulatory, reproductive, excretory, immune, nervous, or musculoskeletal?