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Circulatory System of a Mammal
Gas Exchange
4
Biology
12th Grade
06/07/2016

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Cards

Term
Why Do You Need a Transport System?
Definition

Exchange materials between them and environment

 

Needs can't be met by body alone

 

Exchange between cells and exchange surfaces

 

Exchange materials between environment, exchange surface and different parts of the body

Term
Specialised Transport Medium With or Without Circulatory Pump?
Definition

Depends on:

 

S.A:Vol ratio

How active organism is

 

low S.A:Vol ratio and active = bigger need for both

Term
Common Features for Large Organisms
Definition

Suitable medium to carry materials (normally water based as readily dissolves things and easy to move around)

 

Transport medium moved around in bulk over large distances

 

Closed tubular vessel system with transport medium and branching network (distribute to all parts of the organism)

 

Mechanism for moving transport medium within vessels

 

Animals rely on muscular contractions or specialised pumping organ

 

Mechanism to maintain mass flow in one direction

 

Means of controlling flow to suit changing needs of different parts of the organism

Term
Transport System in Mammals
Definition

Closed blood system confined in vessels (heart circulates)

 

Double circulatory system (passes through heart twice for each circuit)

 

Blood through lungs is low pressure

 

High pressure to go to heart before circulation so substances delivered quickly

 

Important for high body temperature and metabolism

 

Last bit = diffusion into cells

 

Rapid as large S.A, short diffusion pathway and steep gradient

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