The Role of Water in Blood & Tissue Fluid Solvent action Water is the main component of blood (where it constitutes 95% of plasma, a straw-coloured liquid) and tissue fluid Tissue fluid is form...
Cells of the Blood Blood is a tissue composed of a number of important specialised cells Red blood cells, monocytes, neutrophils and lymphocytes all have distinguishable structures which enable the...
Arteries, Veins & Capillaries: Structures & Functions Arteries, veins and capillaries all have varying structural features Blood vessels structure & function table Worked example: Blood...
Arteries, Veins & Capillaries: Observing & Drawing Arteries, veins and capillaries have distinctive structures which reflect their differing roles throughout the body The walls of arteries ...
The Main Blood Vessels The pulmonary and systemic circulations are features of a double circulatory system, where blood passes through the heart twice in one full circuit around the body The pulmon...
Closed Double Circulatory System The need for a circulatory system The cells of all living organisms need a constant supply of reactants for metabolism, e.g. oxygen and glucose Single celled organi...
Phloem: Mass Flow The Mass Flow Hypothesis was the model initially used to explain the movement of assimilates in the phloem tissue The mass flow hypothesis was modelled by Ernst Münch in 1930. His...
The Sucrose Loading Mechanism Assimilates such as sucrose are transported from source to sink through the phloem sieve tubes Carbohydrates are generally transported in plants in the form of sucrose...
Movement in the Phloem Although translocation could refer to the transport of substances in the xylem and phloem, as it means ‘moving from one place to another,’ it is more commonly connected with ...
