Cellular Homeostasis and Transport Mechanisms Explained

The video explains how cells maintain a stable internal environment through dynamic homeostasis, involving passive and active transport mechanisms. Passive transport includes diffusion and facilitated diffusion, where particles move along the concentration gradient without energy. Active transport requires ATP to move particles against the gradient, exemplified by the sodium-potassium pump. Bulk transport, including endocytosis and exocytosis, moves larger quantities of materials using vesicles. The video concludes with a summary and links to further learning resources.

What is the term used to describe the process by which cells maintain a stable internal environment?

• Dynamic homeostasis

• Dynamic equilibrium

• Static homeostasis

• Cellular balance

In diffusion, particles move from an area of _____ concentration to an area of _____ concentration.

• low; high

• high; low

• random; random

• equal; equal

Which type of transport involves the use of channel proteins but does not require ATP?

• Active transport

• Bulk transport

• Simple diffusion

• Facilitated diffusion

What is the primary energy source used in active transport?

• GTP

• ATP

• NADH

• Glucose

Which of the following is an example of active transport?

• Osmosis

• Sodium-potassium pump

• Facilitated diffusion

• Simple diffusion

What process allows cells to move large quantities of materials across the membrane?

• Active transport

• Bulk transport

• Facilitated diffusion

• Simple diffusion

Endocytosis and exocytosis are types of which transport mechanism?

• Passive transport

• Active transport

• Bulk transport

• Facilitated diffusion

Which of the following statements is true about exocytosis?

• It requires no energy.

• It uses protein channels.

• It releases materials outside the cell.

• It involves the engulfing of particles.

What is the main difference between passive and active transport?

• Neither require energy.

• Passive transport requires energy, active transport does not.

• Active transport requires energy, passive transport does not.

• Both require energy.

Which transport mechanism is used by cells to maintain concentration gradients?

• Bulk transport

• Active transport

• Facilitated diffusion

• Passive transport