Module 1 biology notes

ƒæAn optical microscope enlarges the image of cells. This is called magnification. To show us small structures within cells, a microscope must be able to distinguish between objects that are close together. This is called resolution . ƒæOptical microscope passes light through a specimen to be viewed. Maximum magnification is about 1500 times and its limit of resolution is about 2um ƒæElectron microscope uses beams of electrons. Its maximum magnification is …

…Red cells(erythrocytes) in the blood transport system ƒæWhite cells in blood are involved in protecting the body from disease ƒæThe heart cycle consists of the atrial systole, the ventricular systole, and the diastole. ƒæThe heart is myogenic. The sinoatrial node (SAN) begins each heartbeat by generating an electrical signal. ƒæExercise increases cardiac output and affects the distribution of blood to the different organs of the body