BIOL 0800 Reading- Chapter 1 Flashcards
What is physiology?
The study of how living organisms function
What is physiological genomics?
The study of the integration of molecular biology with physiology; explains how the changes are produced at the level of the gene by external or internal stimuli
What is the simplest structural unit into which a complex multicellular organism can be divided and still retain the functions characteristic of life?
A cell
What is cell differentiation?
The process by which cells transform into specialized cells
What are the four main cell categories?
Muscle, nerve, epithelial, and connective-tissue
What are the three types of muscle cells?
Skeletal, cardiac, and smooth
What are tissues?
Differentiated cells with similar properties aggregated together
What are the four general types of tissues?
Muscle, nervous, epithelial, and connective
What are muscle cells?
Specialized to generate mechanical force, attached through other structures to bones, produce movement, attached to skin; voluntary contraction
What are cardiac muscle cells?
Found only in the heart, generate force to contract the heart and pump blood into circulation; involuntary
What are smooth muscle cells?
Surround many body tubes; contract to decrease the diameter of shorten the length of the tubes; involuntary
What is a neuron?
Specialized to initiate, integrate, and conduct electrical signals to other cells
What provides the major means of controlling the activities of other cells?
Neurons
What is a nerve?
An extension of neurons packaged in connective tissue to carry signals to the body
What are epithelial cells?
Specialized for the selective secretion and absorption of ions and organic molecules and for protection; named according to shape
What are the four main shapes of epithelial cells?
Cuboidal, columnar, squamous, and ciliated
What kind of epithelium lines the inner surface of the trachea?
Ciliated to help mucus into the trachea and mouth
What do basolateral and apical mean?
The sides of cells anchored to the basement membrane or facing the interior (lumen), respectively
What is one defining feature of the two sides of all epithelial cells?
Both sides often are responsible for different functions
What kind of junction holds together epithelial cells?
Tight junctions to form boundaries between body compartments and to function as selective barriers to regulate the exchange of molecules
Why are epithelial cells connected by tight junctions along their lateral surfaces?
To form boundaries between body compartments and to function as selective barriers to regulate the exchange of molecules
Give an example of the differentiated functions of the basolateral and apical membranes of kidney tubule cells.
Basolateral side: transport glucose out of the cell and into the bloodstream; Apical side: transport glucose into the epithelial cell itself for energy
What are connective-tissue cells?
Connect, anchor, and support the structure of the body
What is the difference between loose and dense connective tissue?
Loose comprises the meshwork of cells and fibers underlying epithelial layers; dense is tough/rigid to comprise tendons and ligaments
What are the four types of connective tissue?
Bone, cartilage, adipose, and blood
What is the function of the extracellular matrix?
Connective tissue; surrounded each cell; provides scaffold for cellular attachments, and transmits into through chemical messengers to help regulate activity/migration/growth/differentiation