IB DP Biology: SL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: SL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: SL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...
IB DP Biology: SL复习笔记6.2.2 The Blood System: Vessels
Arteries Introduction to blood vessels The circulatory system of the human body contains several different types of blood vessel: Arteries Arterioles Capillaries Venules Veins Each type of blood ve...
IB DP Biology: SL复习笔记6.2.1 The Blood System: History
Discovery of the Circulation of Blood NOS: Theories are regarded as uncertain; William Harvey overturned theories developed by the ancient Greek philosopher Galen on movement of blood in the body A...
IB DP Biology: SL复习笔记6.1.4 Skills: Digestion & Absorption
Digestive System Diagram Human Digestive System The human digestive system includes the following: Glands - the salivary glands, and glands in the pancreas that produce digestive juices The stomach...
IB DP Biology: SL复习笔记6.1.3 Absorption
Methods of Absorption Digestion breaks down food into smaller, soluble molecules These products of digestion then pass from the lumen of the intestine into the blood They pass through the microvill...
IB DP Biology: SL复习笔记6.1.2 Villi & Absorption
Villi: Increasing the Surface Area The ileum (the second section of the small intestine) is adapted for absorption It is very long It has a highly folded surface It has millions of villi (singular ...
IB DP Biology: SL复习笔记6.1.1 Digestion
Introduction to Digestion The digestive system is an example of an organ system in which several organs work together to digest and absorb food Digestion is a process in which relatively large, ins...
IB DP Biology: SL复习笔记5.2.7 Skills: Classification & Cladistics
Dichotomous Keys For anyone who doesn't specialise in studying a particular group of organisms, it can be very difficult to identify, or ID, a species when working in the field Correctly identifyin...
IB DP Biology: SL复习笔记5.2.6 Reclassification
Cladistics & Reclassification The development of DNA sequencing technology means that classification can now be carried out on the basis of evolutionary relationship Organisms classified in thi...
IB DP Biology: SL复习笔记5.2.5 Cladistics
Clades The term clade can be defined as A group of organisms that have all descended from a common ancestor Cladistics is the branch of science in which scientists put organisms into clades It invo...
