Some organisms are this, meaning they have only one cell
What is unicellular organisms?
100
When humans take in air, it is known as this
What is inspiration?
100
Blood vessels warm the air as it travels to the lungs; on its way to the lungs, air passes through this
What is the trachea?
100
This is the pump of the circulatory system
What is the heart?
100
Blood that is deoxygenated has traveled through the body and has delivered oxygen to cells; however, this type of blood has passed through the lungs to pick up oxygen to deliver to the cells
What is oxygenated blood?
200
These organisms are composed of many cells that work together to carry out life processes
What are multicellular organisms?
200
This refers to the movement of air in and out of the lungs
What is respiration?
200
Breathing out is called this
What is expiration?
200
The heart pumps blood in one direction through a system of these called arteries and veins
What are vessels?
200
These pump blood away from the heart throughout the body
What are arteries?
300
These are groups of cells that perform the same function
What are tissues?
300
From the trachea, air flows into these tubes which branch off and go into the lung tissue
What are bronchial tubes?
300
To take a breath, a special muscle called this must contract
What is the diaphragm?
300
These return blood from the body to the heart
What are veins?
300
These are red blood cells and are the most numerous cells in blood
What are erythrocytes?
400
Several types of tissues grouped together to perform particular functions are called these
What are organs?
400
These are air sacs rich in blood vessels where gas exchanged takes place between lungs and blood
What are alveoli?
400
This is a chemical process that takes place in the mitochondria of cells where oxygen and glucose react to form ATP
What is cellular respiration?
400
This is a protein that carries oxygen and is found in red blood cells
What is hemoglobin?
400
These are white blood cells that function in the immune system; they are capable of moving through walls of vessels to migrate to an injury or infection site
What are leukocytes?
500
This is a group of organs working together for a particular function
What is an organ system?
500
Alveoli are filled with chemicals that aid the movement of molecular oxygen and this into and out of the lung tissue
What is carbon dioxide?
500
When we breathe out, we rid our bodies of this
What is carbon dioxide?
500
These are cell fragments that play a role in repairing damaged vessels; they are the first on the scene to begin the clotting process
What are platelets?
500
This is the liquid portion of blood, which contains water and substances such as minerals, hormones, vitamins, and other naturally and artificially occurring chemicals