IB DP Biology: HL复习笔记6.3.5 Antibiotic Resistance
Antibiotic Resistance Within a bacterial population, there is variation caused by mutations (as occurs in populations of all species) A chance mutation might cause some bacteria to become resistant...
IB DP Biology: HL复习笔记6.3.4 Antibiotics
Antibiotics Antibiotics are drugs that inhibit the growth of microorganisms Most antibiotics kill or stop the growth of bacteria (prokaryotes) but do not harm the cells of the infected organism Thi...
IB DP Biology: HL复习笔记6.3.3 White Blood Cells
White Blood Cells Phagocytes are white blood cells that are produced continuously in the bone marrow They are responsible for removing dead cells and invasive microorganisms; a non-specific immune ...
IB DP Biology: HL复习笔记6.3.2 Blood Clotting
Platelets When the skin is cut, microorganisms have an entry point to get into the body The first line of defence is compromised In order to minimise the risk of substantial blood loss and entry of...
IB DP Biology: HL复习笔记6.3.1 Skin
Skin The skin and mucous membranes form a primary defence against pathogens that cause infectious disease Skin is the largest organ of the body and is covered in microorganisms that usually cause n...
IB DP Biology: HL复习笔记6.2.6 Skills: The Blood System
The Structure of the Heart Heart structure The heart has two sides: The left side pumps oxygenated blood around the body in the systemic circulation The right side pumps deoxygenated blood to the l...
IB DP Biology: HL复习笔记6.2.5 The Heart Rate
Heart Rate: Alteration by Nervous System Although the heart muscle maintains a base heart rate via myogenic stimulation, there are several circumstances that can cause an individual's heart rate to...
IB DP Biology: HL复习笔记6.2.4 The Blood System: Cardiac Cycle
Introduction to the Heart Mammalian heart structure The heart is a hollow, muscular organ located in the chest cavity The heart is divided into four chambers The two top chambers are atria The bott...
IB DP Biology: HL复习笔记6.2.3 The Blood System: Double Circulation
Double Circulation The need for a circulatory system All organisms need to transport materials to where they are needed inside their tissues Small organisms (or relatively inactive animals like jel...
