18 Questions
Which type of cell junction allows the transfer of cytoplasm and solutes between adjacent cells?
Gap junctions
The main function of absorption barriers in the body is to:
Protect tissues and organs from harmful compounds
What is the primary function of desmosomes in tissues?
To provide structural support and enable cells to function as a unit
Which of the following is a characteristic of passive diffusion?
It occurs down the concentration gradient
Which type of membrane protein is responsible for the selective permeability of the cell membrane?
Integral proteins
What is the primary function of the extracellular fluid in the body?
To regulate the concentration of solutes and nutrients
Which of the following statements about the cell membrane is true?
Integral proteins are embedded within the lipid bilayer.
What is the primary function of transport proteins in the cell membrane?
To facilitate the movement of molecules across the membrane.
Which of the following components of the cell membrane is responsible for cell recognition and immunological functions?
Glycoproteins
What is the primary function of epithelia?
To cover and protect internal and external body surfaces.
Which of the following statements about the structure of epithelia is true?
Epithelia contain a layer of collagen with one or more layers of epithelial cells.
What is the role of cell surface receptors in the cell membrane?
To act as sites of recognition for hormones and mediators.
What is the primary function of the intermembrane space between adjacent epithelial cells?
To provide a pathway for the diffusion of small molecules
What is the primary role of the tight junctions that bind the cells in the epithelial layer?
To protect the interior of the tissue or organ by preventing the diffusion of solutes
Which of the following best describes the asymmetric distribution of transport proteins on the cell membrane of epithelial cells?
Transport proteins are unevenly distributed, with more on the apical (outer) side than the basolateral (inner) side
Which of the following best describes the structure of the lipid bilayer in the cell membrane?
The lipid bilayer is composed of two layers of phospholipids, with integral proteins embedded throughout
How do the characteristics of the epithelial cells vary across different tissues and organs?
Epithelial cells can vary from thin and permeable to thick and keratinized, depending on the tissue or organ
What is the primary function of the extracellular fluid that fills the intermembrane space between adjacent epithelial cells?
To provide a pathway for the diffusion of large molecules between cells
Test your knowledge on the composition and dynamic changes of cell membranes, including the roles of lipid molecules, transverse diffusion, specialized membrane proteins, and cholesterol in animal cells.
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