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AUTOTROPHIC ORGANISMS AND HETROTROPHIC ORGANISMS
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DIVISION OF ORGANISMS
ORGANISMS CAN BE DIVIDED INTO TWO CLASSES ON THE BASIS OF THEIR METHODS
PROKARYOTES ➤ DEFINITION ; ★ PROKARYOTIC CELLS HAVE NO PROMINENT NUCLEUS AND MEMBRANE BOUND ORGANELLES . ➤ DERIVED FROM; ★ IT IS DERIVED FROM GREEK WORD PRO MEANS "BEFORE" AND KARYON MEANS "NUCLEUS" . ➤ GENETIC MATERIAL; ★ IN PROKARYOTIC CELLS THE GENETIC MATERIAL (DNA) IS WITHOUT ANY NUCLEAR MEMBRANE COVERING AND IS DIRECTLY SUBMERGED IN THE CYTOPLASM. ➤ PROKARYOTES; ★ ORGANISMS POSSESSING PROKARYOTIC CELLS CALLED PROKARYOTES. ➤ DIVISION OF CELLS; ★ IN PROKARYOTES MITOSES IS MISSING AND CELL DIVIDES BY BINARY FISSION. ➤ RIBOSOMES; ★ PROKARYOTIC CELLS HAVE SMALL SIZED RIBOSOMES "SEDIMENTS AT 70S" . ➤ DISTINCTIVE FEATURE OF PROKARYOTES; ★ PERHAPS THE MOST DISTINCTIVE FEATURE OF THE PROKARYOTIC CELL IS ITS "CELL WALL" ,COMPOSED OF POLYSACCHARIDE CHAINS BOUND BY COVALENTLY TO SHORTER CHAINS OF AMINO ACIDS FORMING ...
HEARTBEAT ➤ The alternating relaxations and contractions make up the cardiac cycle and one complete cardiac cycle makes one heartbeat.and in other words, one complete pulsation of the heart is called heartbeat. It is the complete regular movement movement of our heart as it passes blood around your body. STEPS OF CARDIAC CYCLE ➤ C omplete cardiac cycle consist of the following steps . CARDIAC DIASTOLE ➤ Atria and ventricles relax and blood is filled in atria. this period is called cardiac diastole. In short, it is the period of relaxation of heart muscles.In one complete heartbeat, diastole lasts about 0.4 seconds. ATRIAL SYSTOLE ➤ It is the last phase in diastole during which the ventricular filling is competed. Immediately after their filling, both atria contracts and pump blood towards ventricles. This period in cardiac cycle is called atrial systole.In o...
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