Circulatory System Of A Mammal Flashcards Preview

Biology-7-Mass Transport > Circulatory System Of A Mammal > Flashcards

Flashcards in Circulatory System Of A Mammal Deck (5)
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1

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

2

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

3

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

4

Describe the circulatory system

Draw it

LUNGS -(pulmonary vein)- LEFT ATRIUM - LEFT VENTRICLE- (aorta)- BODY- VENA CAVA- RIGHT ATRIUM- RIGHT VENTRICLE-( pulmonary artery)- LUNGS

5

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