Membrane Structure
The flexible covering that controls what enters and leaves the cell.
What is the cell membrane?
Particles spread from where there are more to where there are fewer by this process.
What is diffusion?
in active transport, what substance play a key role?
Proteins
What is the term for maintaining a stable internal environment while obtaining all the chemicals needed to support life?
What is homeostasis?
The basic unit of structure and function in all living things.
What is a cell?
These parts of the membrane help substances cross it.
What are membrane proteins?
Water moves across the cell membrane by this process.
What is osmosis?
The cell wraps around material and brings it inside by this process.
What is endocytosis?
This lets some substances pass through the membrane but blocks others.
What is selective permeability?
Different tissues working together form this.
What is an organ? Organs working together form an organ system.
This model describes a flexible membrane with parts that can move.
What is the fluid mosaic model?
A substance moves through a membrane protein from where there is more to where there is less by this process.
What is facilitated diffusion?
This process allows large particles to leave a cell.
What is exocytosis?
Which two important substances need the help of transport proteins to get inside a cell because they cannot pass through the membrane alone?
Sugar and water
A group of similar cells working together.
What is a tissue?
This organelle acts like the cell's power plant, turning nutrients into usable energy.
What is the mitochondria?
What are the two main ways that a cell transports substances across its membrane, and which one requires the cell to use energy?
The two ways are passive transport (which does not use energy) and active transport (which requires energy).
This organelle acts like the cell's power plant, turning nutrients into usable energy.
What is the mitochondria?