Patho Exam 1 Flashcards
Passive transport carriers (non ATP driven)
Transporters not linked to Na+ gradient
ex. Glucose transporters in pancreas. Insulin signals for transporters to open
Types of connective tissue
loose connective tissue, adipose tissue, dense fibrous connective tissue, elastic connective tissue, cartilage, osseous tissue (bone), and blood.
idiopathic
cause unknown
Proto-oncogenes: nuclear transcription factors
transcription factors are usually sequestered and prevented from random activity
mutations in transcription factor genes may cause overproduction or interference of normal mechanisms.
IgM
first antibody, activates complement
acute clinical course
short-lived, may have severe manifestation
Na+ driven carriers (non ATP driven)
specific sites in the body require a secondary active transport by using Na+ gradient pulls in nutrients and ions
nucleus
largest organelle
protect and preserve genetic information for replication
Carriers (small molecule)
Na+ driven carriers
dysplasia (potentially reversible)
abnormal variations in size, shape and arrangement, often cancerous
What is a shift to the left a sign of?
increased neutrophils are a sign of a bacterial infection
characteristics of neoplastic cells
-altered expression of cellular genes in an accelerated mode
-cellular replication may harm the host if benign and most assuredly if malignant
Gap juntions
Found in most tissues
Allow small molecules to move from cell to cell
Synchronized functions: cardiac muscle, peristalsis, embryogenesis
Lysosome
spherical single layer organelle that originates in the golgi apparatus
contains digestion enzymes
platelet-activating factor
similar effect to leukotriene, platelet activating
interleukin 7
promotes T cell proliferation
Normal WBC?
5000-9000
chronic clinical course
may last moths or years, sometimes following an acute course
Proto-oncogenes: cytoplasmic signaling molecules
Production of excessive or abnormal components of the intracellular signaling pathways. RAS gene mutations in 16-20% (slide 30%) of all human cancers.
communication through secretion
-ligands in the intracellular compartment
-signaling chemicals are secreted and received at specific cell target cells at receptor sites
secretion of chemical mediators via ligands in the form of synaptic, paracrine endocrine and autocrine signaling.
proto-oncogene cause of cancer
gain of function mutations (overactivity of a gene)
Rb gene
considered master brake in the proliferation cycle
loss of function of this gene common in many cancers, named after retinoblastoma
What are the four broad categories of proto-oncogenes?
growth factors/mitogens
growth factor receptors
cytoplasmic signaling molecules
nuclear transcription factors
necrosis
Usually occurs due to ischemia or toxic injury. Characterized by cell rupture, spilling of cell contents into extracellular fluid, and inflammation