Membrane Transport - Nerve Phys

Front

What forms the channels and pumps in the phospholipid bilayer?

Back

Proteins

Front

What type of transport requires energy to move substances against a concentration gradient?

Back

Active transport

Front

What is the movement of molecules from an area of high concentration to an area of low concentration without energy called?

Back

Passive transport

Front

What is the process called when water moves across a semipermeable membrane?

Back

Osmosis

Front

What type of diffusion involves the use of protein channels to help move substances across the membrane?

Back

Facilitated diffusion

Front

What is the primary function of sodium-potassium pumps in neurons?

Back

To maintain the resting membrane potential by moving Na+ out and K+ into the cell.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not.

Front

What is the role of carbohydrates in the cell membrane?

Back

They serve as recognition sites for cell signaling and communication.

Front

What happens during depolarization in a neuron?

Back

Sodium ions rush into the neuron, making the inside more positive.

Front

What is the significance of the axon hillock in nerve transmission?

Back

It is the site where action potentials are initiated.