Circulatory System Of A Mammal Flashcards
What two factors depend on whether or not there is a specialised transport medium or if it is circulated by a pump
SA to volume ratio
How active the organism is
What features do the transport systems of many organisms have
A suitable medium in which to carry materials e.g. blood
A form of mass transport in which the transport medium is moved around in bulk over large distances - more rapid then diffusion
A closed system of tubular vessels that contains the transport medium and forms a branching network so distribute it to all parts of the organism
A mechanism for moving the transport medium within vessels - this requires a pressure difference between one parr or the system and the other
A mechanism to maintain the mass flow movement in one direction
A means of controlling the flow of the transport medium to suit the changing needs of different parts of the organism
A mechanism for the mass flow of water or gases e.g. intercostal muscles and diaphragm in breathing
How do plants and animals achieve a pressure difference between one part of the system and the other
Animals use muscular contraction either of the body muscles or of a specialised pimping organ (heart)
Plants rely on natural passive processes such as the evaporation of water
Describe the circulatory system
Draw it
LUNGS -(pulmonary vein)- LEFT ATRIUM - LEFT VENTRICLE- (aorta)- BODY- VENA CAVA- RIGHT ATRIUM- RIGHT VENTRICLE-( pulmonary artery)- LUNGS
State the main advantage of the double circulation found in mammals
It increases blood pressure and therefore the rate of blood flow to the tissues
