TCDHA Histology- Lectures 1,2,3,4,5 Questions & Answers(RATED A+)

cell -ANSWER smallest unit of life function: carry out vital processes of absorption, assimilation, respiration, irritability, conductivity, growth, reproduction and excretion exo/endocytosis -ANSWER exocytosis: expulsion of materials out of cell EX= EXIT endocytosis: uptake of materials into cell EN=ENTER -pinocytosis: cell drinking (pino=wine=drinking) -phagocytosis: cell eating cell membrane -ANSWER plasma membrane surrounds celll composed of phospholipid bilayer and proteins cytoplasm -ANSWER cytosol clear liquid enclosed in cell by cell membrane includes organelles and vacuoles organelles -ANSWER metabolically active specialized structures within the cell allow each cell to function according to its genetic code major organelles -ANSWER Nucleus Mitochondria Ribosomes Endoplasmic reticulum Golgi Apparatus Lysosomes Cytoskeleton tight junctions & location -ANSWER closes intercellular space between cells by fusing cell membranes together prevents movement/ loss of fluid location: lining of small intestine desmosomes & location -ANSWER bind cells together by creating spot welds between adjacent membranes location: cells of outer skin and oral mucosa Hemidesmosomes -ANSWER attachment of cell to adjacent non cellular surface allows gingival tissue to adhere to tooth surface by epithelial attachement gap junctions & location -ANSWER form tubular channels between cells- allow exchange of substances location:- muscle cells of heart -digestive tube life cycle of cell -ANSWER 1) interphase- DNA replication 2) mitosis- cell division 3) cytokinesis- cytoplasmic division 4) differentiation- less specialized becomes more specialized epithelial tissue -ANSWER forms protective coverings function in secretion/ sensory/ absorption protects inner structures from: -physical, chemical and pathogenic attacks -dehydration -heat loss (acts as ba