Cells & Body Systems

From cells to tissues to organs to systems.

12 questions, free, marked as you go with a worked explanation on every one.

What this covers

What is the basic unit of life?
A group of similar cells working together is called a:
The heart is part of which body system?
Which organ is primarily responsible for pumping blood?
Which system is responsible for breaking down food?
A type of bacterial cell divides in two every 20 minutes. A sample starts with 5 cells and is kept warm for 2 hours. How many cells are in the sample at the end of the 2 hours?
In the lungs, oxygen moves out of the air sacs and into the blood. What best explains that movement?
After a set of stairs, a student takes her pulse and counts 21 beats in 10 seconds. What is her heart rate in beats per minute?
Use the table. As a cube gets larger, what happens to its surface area to volume ratio, and why does this limit how large a single cell can grow?
Which organelle controls a cell's activities and contains its genetic material?
Which correctly orders life's levels of organization, from smallest to largest?
Which structure is found in plant cells but not in animal cells?