CELL

CELL

  • Submitted By: Yengyeng
  • Date Submitted: 08/13/2015 1:53 AM
  • Category: Science
  • Words: 907
  • Page: 4

´╗┐CELLULAR STRUCTURES AND FUNCTIONS
THREE DIFFERENT ELEMENTS IN THE BODY
CELLS
INTERCELLULAR SUBSTANCES
BODY FLUIDS
CELL
Smallest functional and structural units of the body
Basic unit of life
TWO BASIC CELL TYPES
EUKARYOTIC CELL
PROKARYOTIC CELL
EUKARYOTIC CELL
Cell which has a true nucleus and surrounded by a nuclear membrane or nuclear envelope
PROKARYOTIC CELL
Cell which has no presence of nucleus
Lacking of nuclear envelope
Nuclear substance is mixed or in direct contact with the rest of the cytoplasm
PHYSIOLOGIC PROPERTIES OF PROTOPLASM
IRRITABILITY
CONTRACTILITY
CONDUCTIVITY
ABSORPTION AND SECRETION
EXCRETION
RESPIRATION
GROWTH AND REPRODUCTION
PRINCIPAL PARTS OF THE CELL
1. CELL MEMBRANE
2. CYTOPLASM
3. NUCLEUS

1. CELL MEMBRANE
TRILAMINAR LAYER
MEMBRANE LIPIDS , MOSTLY PHOSPHOLIPIDS HAVE A HYDROPHILIC PHOSPHATE WHICH IS POLAR IN NATURE AND A HYDROPHOBIC WHICH IS A NON-POLAR END
FUNCTION OF THE CELL MEMBRANE
GIVES SHAPE TO THE CELL
DELIMITS OR SEPARATE THE CELL FROM THE ENVIRONMENT
REGULATES THE PASSAGE OF MATERIALS IN AND OUT OF THE CELL
SERVES AS THE RECOGNITION SITE ACTING AS ANTIGENIC DETERMINANTS
SERVES AS THE SELECTIVE BARRIERS PROVIDING FOR THE SELECTION OF WHAT ENTERS AND LEAVES THE CELL
SELECTIVE PERMEABILITY

MODIFICATION OR SPECIALIZATION OF THE CELL MEMBRANE
a. JUNCTIONAL COMPLEX
STRUCTURES THAT PROVIDE FOR CELL ATTACHMENTS
TYPES OF JUNCTIONAL COMPLEXES
DESMOSOMES
INTERMEDIATE JUNCTION
NEXUS / GAP JUNCTION
TIGHT JUNCTION
DESMOSOMES
MACULA ADHERENS
POINTS OF FIRM INTERCELLULAR ADHESIONS
ABUNDANT IN STRATIFIED EPITHELIA OF THE MOUTH , ESOPHAGUS , SKIN AND VAGINA
I. SIGNIFICANCE OF DESMOSOME
SITE OF ATTACHMENT OF THE CYTOSKELETON TO THE CELL SURFACE
SITES OF CELL TO CELL ADHESIONS
II. INTERMEDIATE JUNCTION
ZONULA ADHERENS
FASCIA ADHERENS
THE INTERCELLULAR SPACE IS FILLED WITH ELECTRON DENSE AMORPHOUS MATERIALS
IT IS QUITE EXTENSIVE IN THE INTERCALATED DISCS OF CARDIAC...

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