HN220 Lecture Notes - Lecture 1: Epithelium, Connective Tissue, Red Blood Cell
Document Summary
The study of functions of living organisms and their parts: dynamic & integrated science. Proper functioning of one part depends on the function of a different part or parts: ex. Oxygen is extracted from air breathed in by the lungs: ex. Blood is pumped by the heart: ex. Muscles require oxygen provided by erythrocytes in blood that are manufactured in bone marrow. Process or mechanism explains the how : mechanistic approach. Red blood cells: [why]: because cells need oxygen and rbcs bring it to them, [how]: oxygen binds to hemoglobin molecules contained in the rbcs. Levels of organization: cell, tissue, organ, organ system. The body has more than 200 different cell types. 4 groups of cell classification: neurons, muscle cells, epithelial cells, connective tissue cells (most abundant cell type) A group of organs: organized to perform more complex functions than any organ alone.
