CIE A Level Biology复习笔记9.1.3 Recognising Tissues
Recognising Tissues in the Gas Exchange System Cartilage Cartilage micrograph Cartilage – electron micrograph The cartilage in the trachea has a ‘glassy’ appearance due to its translucent protoplas...
CIE A Level Biology复习笔记9.1.2 Distribution of Tissues
Distribution of Tissues in the Gas Exchange System Cartilage is a strong and flexible tissue found in various places around the body One place is in rings along the trachea, called Tracheal rings T...
CIE A Level Biology复习笔记9.1.1 The Human Gas Exchange System
The Human Gas Exchange System Gas exchange takes place in the human thorax. This is a collection of organs and tissues in the chest cavity The main structures of the human gas exchange system Thora...
CIE A Level Biology复习笔记8.3.4 Heart Action
Heart Action: Initiation & Control Control of the basic heartbeat is myogenic, which means the heart will beat without any external stimulus This intrinsic rhythm means the heart beats at aroun...
CIE A Level Biology复习笔记8.3.3 The Cardiac Cycle
The Cardiac Cycle The contraction of the heart is called systole, while the relaxation of the heart is called diastole Atrial systole is the period when the atria are contracting and ventricular sy...
CIE A Level Biology复习笔记8.3.2 The Walls of the Heart
The Walls of the Heart The muscular walls of the atria are thinner than those of the ventricles When the atria contract, the thin muscular walls do not generate much pressure, but enough to force b...
CIE A Level Biology复习笔记8.3.1 Structure of the Heart
Mammalian Heart Structure Heart structure The human heart has a mass of around 300g and is roughly the size of a closed fist The heart is a hollow, muscular organ located in the chest cavity It is ...
CIE A Level Biology复习笔记8.2.5 The Bohr Shift
The Bohr Shift Changes in the oxygen dissociation curve as a result of carbon dioxide levels are known as the Bohr effect, or Bohr shift When the partial pressure of carbon dioxide in the blood is ...
CIE A Level Biology复习笔记8.2.4 The Oxygen Dissociation Curve
The Oxygen Dissociation Curve The oxygen dissociation curve shows the rate at which oxygen associates, and also dissociates, with haemoglobin at different partial pressures of oxygen (pO2) Partial ...
