,PHYSIOLOGY
Mr John writer
CELLS
BASIC UNITS OF LIFE
___
MedicStein
Cell
Introduction
•The cell is the structural and functional unit of the living body.
General Characteristics of a Cell:
•Needs nutrition and oxygen.
•Produces its own energy.
•Eliminates carbon dioxide and metabolic wastes.
•Maintains its environment.
•Responds to invaders.
•Reproduces by division (except neurons).
Tissue: A group of cells with similar function.
Primary Tissue Types:
•Muscle tissue (skeletal, smooth, cardiac).
, 2
•Nervous tissue (neurons, supporting cells).
•Epithelial tissue (squamous, columnar, cuboidal).
•Connective tissue (connective tissue proper, cartilage, bone, blood).
Organ: Structure formed by two or more primary tissues executing specific
functions.
•Tubular or hollow organs.
•Compact or parenchymal organs.
System: Group of organs working together to carry out specific bodily functions.
Examples include:
•Digestive system
•Excretory system
•Cardiovascular system
•Respiratory system
•Reproductive system
•Endocrine system
•Musculoskeletal system
•Nervous system
Structure of the Cell
Mr John writer
CELLS
BASIC UNITS OF LIFE
___
MedicStein
Cell
Introduction
•The cell is the structural and functional unit of the living body.
General Characteristics of a Cell:
•Needs nutrition and oxygen.
•Produces its own energy.
•Eliminates carbon dioxide and metabolic wastes.
•Maintains its environment.
•Responds to invaders.
•Reproduces by division (except neurons).
Tissue: A group of cells with similar function.
Primary Tissue Types:
•Muscle tissue (skeletal, smooth, cardiac).
, 2
•Nervous tissue (neurons, supporting cells).
•Epithelial tissue (squamous, columnar, cuboidal).
•Connective tissue (connective tissue proper, cartilage, bone, blood).
Organ: Structure formed by two or more primary tissues executing specific
functions.
•Tubular or hollow organs.
•Compact or parenchymal organs.
System: Group of organs working together to carry out specific bodily functions.
Examples include:
•Digestive system
•Excretory system
•Cardiovascular system
•Respiratory system
•Reproductive system
•Endocrine system
•Musculoskeletal system
•Nervous system
Structure of the Cell
