Cell membrane, transport, and homeostasis

Cell membrane

A very flexible barrier on the outside of all cells what controls what enters and exits the cell

Passive transport

The movement of molecules across the membrane with no energy

Osmosis

The specific diffusion of water molecules across a selective permeable membrane from any area of high water potential to an area of low water potential

Active transport

Movement of molecules across the membrane with energy

Cell Homeostasis

State of balance among all body systems needed for survival and to function

Feedback mechanism

Regulation system in a living body that works to return the body to its normal internal state

On a cellular level cells maintain homeostasis changing conditions by

Transporting materials across the membrane by passive transport and active transport

Simple diffusion

The passive movement of small and non polar molecules (that need no help) from an area of high concentration to an area of low concentration without using energy or transport proteins.

Facilitated diffusion

The passive movement of large and polar molecules across a membrane with the help of special transport proteins from moving an area of high concentration to low concentration without using energy.

What is the process in which water molecules diffuse across a selectively permeable membrane

Osmosis

Energy for a sales active transport comes from

Mitochondria

The structure, most responsible for maintaining cell homeostasis

Plasma membrane

Diffusion continues until

Equilibrium is reached

Which of the following terms would describe only allowing some materials in and out of the cell?

Selective permeable

Which of the following serves as the cell boundary from its environment?

Cell membrane

The cell membrane contains channels and pumps that help move materials from one side to the other side. What are these channels and pumps made out of?

Proteins

During diffusion when the concentration of molecules on both sides of a membrane is the same, the molecule will?

Continue to move across the membrane in both directions

Which term describes a relatively constant internal physical conditions of an organism

Homeostasis