Gas Exchange and Transport

Lung

• transport through a membrane from an area of low concentration to high concentration with the use of energy
• blood vessel that carries blood away from the heart
• transport through a membrane from an area of high concentration to low concentration without the use of energy
• respiratory organ; place where gases are exchanged between the blood and inhaled air

Alveoli

• property of biological membranes that allows some substances to pass across it while others cannot; also called semipermeable membrane
• flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surrounding
• diffusion of water through a selectively permeable membrane
• one of the many tiny air sacs at the end of a bronchiole in the lungs that provide surface area for gas exchange to occur

Diaphragm

• transport through a membrane from an area of high concentration to low concentration without the use of energy
• Muscle that controls inhalation and exhalation
• one of the many tiny air sacs at the end of a bronchiole in the lungs that provide surface area for gas exchange to occur
• respiratory organ; place where gases are exchanged between the blood and inhaled air

Heart

• relatively constant internal physical and chemical conditions that organisms maintain
• transport through a membrane from an area of high concentration to low concentration without the use of energy
• hollow muscular organ that pumps blood throughout the body
• process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated

Arteries

• blood vessel that carries blood away from the heart
• thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell
• blood vessel that carries blood towards the heart

• blood vessels where gas exchange occurs

Veins

• blood vessel that carries blood towards the heart
• process of diffusion in which molecules pass across the membrane through cell membrane channels
• blood vessel that carries blood away from the heart

• blood vessels where gas exchange occurs

Capillaries

• blood vessels where gas exchange occurs
• blood vessel that carries blood towards the heart
• hollow muscular organ that pumps blood throughout the body
• blood vessel that carries blood away from the heart

Cell Membrane

• hollow muscular organ that pumps blood throughout the body
• property of biological membranes that allows some substances to pass across it while others cannot; also called semipermeable membrane
• thin, flexible barrier that surrounds all cells; regulates what enters and leaves the cell
• process of diffusion in which molecules pass across the membrane through cell membrane channels

Active Transport

• transport through a membrane from an area of low concentration to high concentration with the use of energy
• diffusion of water through a selectively permeable membrane
• transport through a membrane from an area of high concentration to low concentration without the use of energy

• process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated 

Passive Transport

• transport through a membrane from an area of high concentration to low concentration without the use of energy
• transport through a membrane from an area of low concentration to high concentration with the use of energy

• 1.      process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated 

• process of diffusion in which molecules pass across the membrane through cell membrane channels