7-3 & 7-4 Flashcards
What is the structure and function of the cell membrane?
Cell membrane is a double layered sheet surrounding the cell that provides protection/support and controls what goes in and out of the cell.
What is diffusion? Does it require energy?
Diffusion is when molecules move from an area of higher concentration to an area of lesser concentration in a liquid solution. DOES NOT require energy.
What does “selective permeable” mean? What advantage is this for the cell membrane?
Selectively permeable means somethings can pass in and out of the membrane and some can’t. It is an advantage because it prevents anything dangerous or harmful from entering the cell.
What is osmosis?
Osmosis is diffusion of water across the selective permeable membrane.
What is the difference between hypertonic, isotonic, and hypotonic?
Isotonic- H2O and sugar solution is balanced, same on both sides of membrane.
Hypertonic- If H2O and sugar solution is above strength, concentrated.
Hypotonic- If H2O and sugar solution is below strength, diluted.
What is the difference between facilitated diffustion and active transport?
Facilitated diffusion is when protein assists in movement of glucose, sugar across cell membrane.
Active transport is going from an area of lesser concentration to an area of higher concentration.
What is the difference between unicellular and multicellular organisms? Give1 example of each,
Unicellular organisms are the one cell that is the organism. ex: bacteria
Multicellular organisms are have many cells. ex: humans
List and define the four levels of organization in multicellular organisms.
Cells: smallest unit of life
Tissue: group of cells that work together to perform a particular function
Organ: group of tissues
System: group of organs that work together to perform a major function
Name 5 human body systems, name 5 human body organs.
Organs: eyes, heart, brain, 2 kidneys, 2 lungs.
Systems: digestive, respiratory, circulatory, skeletal, nervous.
Explain cell specialization. List 3 examples.
Cell specialization is different roles for each type of cell.
3 examples: Red blood cells-transfer oxygen throughout the body. Muscle cells- contract and relax to move parts of body. Nerve cells-transfer info. throughout the body.
