Question

1. describe how the cell membrane helps maintain homeostasis.

Explanation:

The cell membrane is selectively permeable, controlling the entry and exit of substances. It regulates the transport of nutrients (e.g., glucose) and the removal of waste (e.g., carbon dioxide). It also helps maintain ion balance (e.g., Na⁺, K⁺) via ion channels and pumps. Additionally, it participates in cell - cell communication (e.g., through receptor proteins) to coordinate responses for homeostasis, and helps in maintaining cell shape and protecting the cell from the external environment, all of which contribute to internal stability.

Answer:

The cell membrane maintains homeostasis in several ways: 1. Selective Permeability: It controls the movement of substances in and out of the cell. Allows essential nutrients (e.g., glucose, amino acids) to enter and waste products (e.g., CO₂, urea) to exit. 2. Ion Regulation: Uses ion channels and pumps (e.g., Na⁺ - K⁺ pump) to maintain proper ion concentrations (e.g., for nerve function, osmotic balance). 3. Cell - Cell Communication: Receptor proteins on the membrane receive signals (e.g., hormones, neurotransmitters) to coordinate cellular responses, helping the body adjust to internal/external changes. 4. Protection and Shape Maintenance: Shields the cell from harmful substances and maintains cell structure, supporting internal stability.