Cells and Tissues: Cell Theory and Organelles

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What is the fundamental concept of the Cell Theory?

Cells are the fundamental units of all living things (correct)

Cells are the basic units of function

Cells are the only units of life

Cells are the smallest unit of structure

Which type of cell junction allows the passage of small molecules and ions between cells?

Tight Junctions

Cell Adhesion Molecules

Gap Junctions (correct)

Desmosomes

What is the primary function of Membrane Flow?

To separate cells from each other

To regulate cell division

To transport proteins between cells

To enable cells to grow, mature, and respond to environmental stimuli (correct)

Which type of cell junction is found in the cells that line the digestive tract?

Tight Junctions Signup and view all the answers

What is the primary function of desmosomes in cells?

To link membranes and facilitate cell attachment Signup and view all the answers

What is the term for the areas of the membrane that attach a cell to another cell or extracellular matrix?

Cell Junctions Signup and view all the answers

What is a characteristic of epithelial tissues that allows them to regenerate when damaged?

The presence of stem cells Signup and view all the answers

What is the role of Connexons in Gap Junctions?

To align and allow the passage of small molecules and ions between cells Signup and view all the answers

What is the term for the surface of an epithelial cell that faces the exterior of the body?

Apical surface Signup and view all the answers

What is the term for the thin layer of tissue that attaches to the basal surface of epithelial cells?

Basement membrane Signup and view all the answers

What determines the classification of epithelial tissues?

Both the number of layers and shape of cells Signup and view all the answers

What is a characteristic of simple epithelium?

It has only one layer of cells Signup and view all the answers

Where can stratified epithelium be found in the body?

Only in protected areas inside the body Signup and view all the answers

What is the characteristic of simple squamous epithelium?

It is thin, flat, and irregular in shape Signup and view all the answers

What is the function of stratified squamous epithelium?

To resist mechanical or chemical stress Signup and view all the answers

What is the characteristic of cuboid epithelial cells?

They are hexagonal in shape Signup and view all the answers

Where can simple cuboid epithelial cells be found?

In the kidney tubules Signup and view all the answers

What is the characteristic of columnar epithelial cells?

They are taller than they are wide Signup and view all the answers

What is the primary function of Simple Columnar Epithelial Cells?

To facilitate absorption or secretion in certain areas Signup and view all the answers

What is the main characteristic of Stratified Columnar Epithelia?

They are rare and found in the pharynx, urethra, and anus Signup and view all the answers

What is the primary difference between Exocrine and Endocrine glands?

The method of secretion Signup and view all the answers

What type of glands produce serous secretions that typically contain enzymes?

Serous Glands Signup and view all the answers

What is the function of Fixed cells in Connective Tissue?

To provide structural support and maintenance to local tissues Signup and view all the answers

What is the characteristic of Fluid Connective Tissue?

It contains a fluid matrix called plasma Signup and view all the answers

What is the main characteristic of cartilage that distinguishes it from other types of supporting connective tissue?

It is avascular due to the presence of a chemical that discourages blood cell formation Signup and view all the answers

Which type of bone tissue contains blood vessels within the matrix?

Compact Signup and view all the answers

What is the unique characteristic of muscle tissue that allows it to contract?

The ability to shorten its cells along the longitudinal axis Signup and view all the answers