6th+Period+Unit+2+Kenji+and+Andres


 * __Unit 2__**

Cells can take in nutrients in order to grow and divide. The call can do this in many different ways. First off, the cell membrane is selectively permeable, meaning that it can choose what comes through and what stays out. Because of this, diffusion can occur. Diffusion is when substances move from crowded areas to less crowded areas. when the amount of particles is the same inside the cell than outside, that means equilibrium has been achieved. Equilibrium is when substances move in and out of the cell at the same rate. Passive transport requires no energy for the cell. A type of passive transport is facilitated diffusion. This is when particles go through the cell membrane. Active transport, however, requires an expense of energy.

There are three types of solutions that show passive transport: Isotonic, Hypertonic, and Hypotonic. An isotonic solution is when the amount of particles in the solution is the same amount as in the cell. This causes water to go in and out of the cell at the same rate.This is the solution when the cell reaches equilibrium In a hypertonic solution, there is a higher particle concentration in the solution; this causes water to rush out and cause the cell to shrink. Hypotonic solutions cause water to rush into the cell because the particle concentration is greater in the cell. All of the solutions are in the photograph below. Active transport uses energy to get needed materials. Some materials are too large to go through the cell membrane, so the call has to do some work. There are two ways a cell can do this: Endocytosis and Exocytosis. In endocytosis, when a particle approaches a cell, the cell prepares for it by making a sort of dent in the membrane. As the particle comes closer, the dent deepens, making a bubble. When the particle is completely in the cell, the membrane pinches off, forming a bubble, and from there it is sent to wherever it needs to be. Inj exocytosis, the particle needs to get out. So, the bubble moves to the membrane and touches it. The bubble and the membrane fuse together, and the membrane opens the bubble, releasing the particle to the outside world.

media type="custom" key="15452764" width="140" height="140"media type="custom" key="16171380" Now lets listen to yoda talk about cell structures and their functions: media type="custom" key="15476318"
 * __Cell Structures__**

Wait what? Is that it? Oh wait, here he is again: media type="custom" key="15542078"

__**How cells are organized**__ media type="custom" key="15542288"


 * __How organ systems help an organism__**


 * Lymphatic system- part of circulatory system; filters bacteria in the blood
 * Respiratory system- breathe air and exhale carbon dioxide; includes lungs, mouth, nose, trachea, and diaphragm
 * Digestive system- breaks down food for energy; includes mouth, esophagus, stomach, small intestine, large intestine—also called the colon—rectum, and anus.
 * Excretory system- expells waste and impurities from body; includes kidneys, bladder, lungs, and sphincters
 * Reproductive system- used to reproduce; testes in men and ovaries in women
 * Integumentary system- works with immune system; blocks most of pathogens entering the body; includes skin and hair
 * Muscular system- muscles that work with skeletal system to provide movement
 * Skeletal system- a network of bones that provide structure and shape; bone marrow produces red blood cells; protect organs
 * Nervous system- makes body movements
 * Endocrine system- sends hormones through the body; includes glands like adrenal glands
 * Circulatory system-carries blood throughout the body; includes the heart
 * __Bibliography__**
 * //Wordle.com//. 2012. Photograph. Alpharetta, GA. //Wordle.com//. By Kenji Lim. Wordle.com, 25 Apr. 2012. Web. 26 Apr. 2012. .
 * Unknown. "Cells." //GA Coach Book//. 42-67. Print.
 * //Difference between Hypertonic, Hypotonic, and Isotonic?// 2010. Photograph. //Http://mcatdaily.blogspot.com/2010/05/difference-between-hypertonic-hypotonic.html//. By Trent. 14 May 2010. Web. 26 Apr. 2012.//
 * Cell Structure//. Photograph. Unknown.// Scienceblogs.com//. Scienceblogs.com. Web. 26 Apr. 2012.//
 * Lim, Kenji. How Cells Are Organized//.// Www.prezi.com//. Www.prezi.com, 27 Apr. 2012. Web. 27 Apr. 2012.//
 * Alzate, Andres. Voki//.// Www.voki.com//. Www.voki.com. Web. 1 May 2012//
 * Organ Systems//. Photograph. Www.google.com/images.// Http://www.google.com/search?tbm=isch&hl=en&source=hp&biw=1024&bih=587&q=organ+systems&gbv=2&oq=organ+systems&aq=f&aqi=g10&aql=&gs_l=img.3..0l10.3015.8278.0.9028.13.7.0.6.6.0.672.968.6j5-1.7.0...0.0._n0BYS8yRW0//. By Unknown. Http://www.google.com/search?tbm=isch&hl=en&source=hp&biw=1024&bih=587&q=organ+systems&gbv=2&oq=organ+systems&aq=f&aqi=g10&aql=&gs_l=img.3..0l10.3015.8278.0.9028.13.7.0.6.6.0.672.968.6j5-1.7.0...0.0._n0BYS8yRW0. Web. 1 May 2012.