Bio 1.2.1: How Homeostasis is Maintained in the Cell
- Cells use buffers to regulate cell pH by neutralizing acids and bases
- Homeostasis is the cell's ability to try and maintain a certain internal temperature for them
- Passive transport- Involves carriers, channels, or direct diffusion through a membrane. There is not external energy used.
- Examples of passive transport is simple diffusion, channel diffusion, and facilitated diffusion
- Passive is one way to maintain homeostasis
- Another way to maintain homeostasis is active transport
- There are two parts of active transport: primary active transport and secondary active transport
- Active transport requires external energy to be used
- P.A.T- Is required to use ATP, an example is the sodium pump
- S.A.T- Does not use ATP. It takes advantage of existing energy via carriers
- There are three types of transports: Carriers, Channels, and Pumps
- The plasma membrane helps with homeostasis by regulating what comes in and out through the cell
- Osmotic pressure will move through a semipermeable membrane and into a solution contain a solute which the membrane is impermeable to help with homeostasis
- Homeostasis Lab Activity Link:
Bio 1.2.2: How Cells Grow and Reproduce
The Growth Cycle: Interphase, Gap O, Gap 1, S Phase, Gap 2, Mitosis (M Phase)
- Interphase: Cell is constantly synthesizing RNA, producing protein, and growing in size
- Gap O: Temporary resting period
- Gap 1: Cells increase in size, produce RNA, and synthesize protein. Also an important piece is in this phase is it makes sure that everything is ready to go for DNA synthesis.
- S Phase: Replication
- Gap 2: Cell continues to grow and produce more protein. Basically the checkpoint to proceed to mitosis
- Mitosis: Division into two daughter cells
- Mitosis is asexual reproduction as you don't go into the fertilization and all that jazz
- Reproduction Virtual Lab Link:
Bio 1.2.3: Cell Adaptions
- Contractile Vacuoles: Helps protists to get rid of excess fluid in the cell. Decreases osmotic pressure and stops the cell from bursting
- Cilia: Slender microscopic hair like things on an organisim to help move through liquid
- Flagella: Tail like appendage that aids in movement
- The flagella is whip like movement
- Psuedopods: Also meaning "false feet" is a cell that can change its shape in order to move
- Eyespots: Allows for it to locate light sources as it is sensitive light
- Chemotaxis: Direct their movement by certain chemicals in their environment
- Phototaxis: Locomotion to move away from or towards any light
- Link To Cheek Cell Lab: