Transporters, Pumps and Channels I

These flashcards cover the key concepts related to transport mechanisms across cell membranes, including electrolyte distribution, membrane composition, and transport pathways.

What are major electrolytes found across a cell's membrane?

Na+, K+, Cl-, HCO3-, and impermanent anions.

What role does membrane composition play in cellular transport?

It governs the movement of molecules into and out of cells.

What is simple passive diffusion?

Movement across the membrane lipids that does not involve a protein.

What are the categories of membrane transport pathways?

Passive Transport, Active Transport, Facilitated diffusion, and Secondary Active Transport.

What is the distribution of Na+ in extracellular and cytoplasm?

145 mEq/L in extracellular fluid and 12 mEq/L in cytoplasm.

What does the lipid bilayer of the plasma membrane do?

Forms a barrier separating intracellular space from extracellular fluids.

What are transport proteins?

Proteins that help move molecules across the plasma membrane.

How do gradients affect molecular movement in cells?

Gradients drive the movement of molecules, electrolytes, and water in and out of cells.

What is the effect of uneven electrolyte concentrations?

Creates a difference in potential across the membrane influencing cellular activities.

What are ion and water channels?

Proteins that facilitate the movement of ions and water across the cell membrane.