Levels of Organization
What is considered to be the smallest living system?
a cell
What is the main function of the digestive system?
Breaks down food and absorbs food and nutrients
What types of molecules can pass through the phospholipid bilayer without help?
small, nonpolar molecules (no charge)
An equal concentration of particles on each side of a membrane (molecules continue to move at equal rates) is called...
equilibrium
Which type of transport involves molecules passing in between the phospholipids of the phospholipid bilayer? (be specific)
simple diffusion
A group of organs working together to perform a certain function is called a(n)...
organ system
What is the main function of the respiratory system?
Takes in oxygen and releases carbon dioxide
The tails of a phospholipid molecule are ...
hydrophobic
A difference in concentration of a particle on either side of a membrane is called ...
a concentration gradient
Which type of transport involves molecules moving from high to low concentration, by way of a channel protein? (be specific)
facilitated diffusion
A group of tissues working together to perform a similar function is called a(n)...
organ
What is the main function of the excretory system?
Removes waste products (like CO2, urine, and sweat) from the body and the bloodstream
The heads of a phospholipid molecule are ...
hydrophilic
If a molecule is moving WITH the concentration gradient, it is moving from ____ to ____ concentration
high to low
Which type of transport involves molecules moving from low to high concentration, by way of a channel protein?
active transport
What are tissues made up of?
Cells
What are the major organs in the excretory system?
liver, kidneys, bladder
What structures allow large molecules to pass through the phospholipid bilayer?
Channel/transport proteins
If a molecule is moving AGAINST the concentration gradient it is moving from ____ to ____ concentration
low to high
Which type of transport can move small, nonpolar molecules?
Simple diffusion
What are the levels of organization from smallest to largest?
cell, tissue, organ, organ system, organism
How does the respiratory system interact with the circulatory system?
It works closely with the circulatory system to transport oxygen and carbon dioxide
What is the main molecule that makes up the cell membrane
phospholipids
a net (overall) movement of particles from high to low concentration is called ...
diffusion
active transport, facilitated diffusion