Cells & Living Things
The basic unit of life.
What is a cell?
Which cell part controls what enters and leaves the cell?
What is a cell membrane?
A body system that breaks down food so nutrients can be absorbed.
What is digestive system?
Part of the body that helps you decide how to respond to an alarm.
What is the brain?
A student runs several laps. What happens to the student's heart rate and breathing rate?
Both increase
An organism made of one cell.
What is unicellular?
A cell part that contains instructions that direct cell activities.
What is a nucleus?
A body system that brings oxygen into the body and removes carbon dioxide.
What is the respiratory system?
Detects stimuli such as sound, light, and heat.
What are sensory receptors?
Why do muscle cells need more oxygen and nutrients during exercise?
To release energy needed for movement.
An organism made of many cells.
What is multicellular?
A cell part that releases usable energy from food and help plants make food using sunlight.
What is chloroplast?
The order of the levels of organization of the body.
What is cell, tissue, organ, and organ system?
What stimulus is detected when you touch a hot surface?
Heat
What is heat?
Which two body systems work together to deliver oxygen to muscle cells during a run?
Respiratory and circulatory systems.
A student uses a microscope to observe a sample. What can the evidence help determine?
Whether the sample is made of cells.
A cell part that provides support and protection for plant cells.
What is a cell wall?
How do the respiratory and circulatory systems work together to supply cells with oxygen?
The respiratory system brings oxygen into the lungs, and the circulatory system carries it in the blood to cells.
Why is quickly pulling your hand away from a hot surface helpful?
It helps prevent injury.
After resting, a student's heart rate and breathing gradually decrease. What does this show about the body?
The body adjusts to changing activity needs.
A rock and a mushroom are both found in nature. What evidence shows that only one is living?
The mushroom is living and made of cells, while the rock is nonliving.
A plant cell's chloroplasts stop working. Explain how this affects the cell.
The cell has difficulty using sunlight to make food.
Many cells in an organ are damaged. Explain how this could affect the organ and its body system.
The organ might not work properly, affecting the body system it belongs to.
How can smelling a familiar food remind you of an earlier experience?
Signals from sensory receptors reach the brain, which may connect the smell to a stored memory.
Use evidence from the running scenario to explain how the body responds to changing needs.
The evidence shows that the body adjusts to activity because heart rate and breathing increase during running and move closer to normal after resting.