The Tiny Unit (Cells)
These are the tiny, microscopic living units that make up the human body.
What are cells?
This organelle contains genes and acts as the control center of the cell.
What is the nucleus?
White blood cells are a key part of this body system.
What is the immune system?
These are "single-celled organisms that get all their nutrients from the environment."
What is bacteria?
A group of cells working together makes up one of these.
What is tissue?
This type of cell is very simple, has no nucleus, and includes bacteria.
What are prokaryotic cells?
Known as the "powerhouse," this organelle makes energy from food.
What is the mitochondria?
These specific white blood cells are the "germ-eaters" and the first to respond to infection.
What are neutrophils?
These must live in a "host cell" to reproduce and eventually destroy the cell.
What are viruses?
Tissues work together to form one of these, such as a lung or a heart.
What is an organ?
This type of cell is more complex, has a nucleus, and includes animal cells.
What are eukaryotic cells?
This jelly-like substance fills the inside of the cell.
What is cytoplasm?
These are the "cleaners" that surround and digest damaged cells or viruses.
What are macrophages?
These single-celled organisms love moisture and are typically spread through water.
What are protozoa?
Multiple organs work together to form one of these.
What is a system?
Most cells are microscopic, but some can be seen using this handheld tool.
What is a magnifying glass?
These organelles are described as the cell's "messengers."
What are ribosomes?
These white blood cells are "memory specialists" that remember previous germs.
What are lymphocytes?
The four main types of germs mentioned are bacteria, viruses, fungi, and these.
What are protozoa? (or Germs)
All systems work together to form this final, complete structure.
What is the body?
This is the term for the structures found inside a cell, meaning "tiny organ."
What are organelles?
This organelle helps cells to divide.
What is the centriole?
While B-cells are formed in bone marrow, T-cells mature in this specific gland
What is the thymus gland?
To see tiny organelles, you need this powerful type of microscope.
What is an electron microscope?
The human body is made up of millions and millions of these types of cells.
What are eukaryotic cells?