Cell Membrane Structure and Function

The main function of the phospholipid bilayer is to regulate what enters and leaves the cell, maintain cell shape, and provide mechanical support.

Hydrophilic regions are the phosphate heads that face outward and interact with water, while hydrophobic regions are the fatty acid tails that face inward and away from water.

Cholesterol helps maintain membrane fluidity.

<p>Passive transport involves the movement of molecules without energy expenditure, such as diffusion and osmosis, while active transport involves the movement of molecules against concentration gradients, requiring energy expenditure.</p> Signup and view all the answers

<p>Carbohydrates attached to proteins or lipids are involved in cell signaling.</p> Signup and view all the answers

<p>The cell membrane's selective permeability allows it to regulate what substances enter and leave the cell, maintaining cellular homeostasis and proper function.</p> Signup and view all the answers

<p>A group of cells having a common origin performing more or less a common or similar function.</p> Signup and view all the answers

<p>Tissue formation occurs mainly in two ways: by repeated cell division and by concrescence.</p> Signup and view all the answers

<p>Tissues form tissue systems, which make up organs, and several organs constitute an organism.</p> Signup and view all the answers

<p>They only represent a group of cells, lacking the level of organization typical of higher organisms.</p> Signup and view all the answers

<p>The functional activities of tissues are not linked to or determined by their mode of origin.</p> Signup and view all the answers

<p>The cells of a tissue have a common origin.</p> Signup and view all the answers