This type of medicine fights bacterial infections, not viruses.
What are antibiotics?
A quick automatic response to a stimulus is called this.
What is a reflex?
Movement of particles from high concentration to low concentration.
What is diffusion?
This system breaks food down into nutrients the body can use.
What is the digestive system?
The plasma membrane is mainly made of this double layer.
What is the phospholipid bilayer?
Viruses are NOT considered this.
What are living cells?
Your skin is considered this type of protection against disease.
What is the first line of defense?
These neuron parts receive incoming signals from other neurons.
What are dendrites?
The diffusion of water across a membrane is called this.
What is osmosis?
This body system transports oxygen and nutrients throughout the body.
What is the circulatory system?
The “fluid mosaic model” describes the membrane as flexible and filled with these.
What are proteins?
This part of the neuron carries signals away from the cell body.
What is the axon?
These special immune cells “remember” pathogens for faster future responses.
What are memory cells?
The gap between two neurons where signals are passed is called this.
What is a synapse?
This type of transport requires energy from the cell and moves objects from low concentration to high concentration
: What is active transport
This system removes carbon dioxide from the body.
What is the respiratory system?
Homeostasis means maintaining this kind of internal environment.
What is a stable internal environment?
Gray matter mainly contains neuron _____ while white matter mainly contains axons.
What are cell bodies?
This is a substance that triggers an immune response in the body.
What is an antigen?
This hormone and gland are linked to the fight-or-flight response.
What are adrenaline and the adrenal gland?
When molecules move through protein channels without using energy, it is called this.
What is facilitated diffusion?
The endocrine gland often called the “master gland.”
What is the pituitary gland?
If water moves into a cell and causes it to swell, the surrounding solution is likely this.
What is hypotonic?
Vaccines help the body prepare to make these protective proteins.
What are antibodies?
This disease weakens the immune system, making infections more dangerous.
What is AIDS?
These neurons carry messages from the brain and spinal cord to muscles.
What are motor neurons?
Draw where water will flow in hypertonic solution

These three systems work together closely to deliver nutrients and remove wastes.
What are the digestive, respiratory, and circulatory systems?
Water naturally moves toward the side with this.
What is a higher solute concentration?
Draw a reflex arc and include sensory neurons, motor neurons, interneurons and stimulus.
