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5563917
Gas Exchange
Descrição
A-Level Biology (Exchange and transport systems) Mapa Mental sobre Gas Exchange, criado por Alex Lyes em 26-05-2016.
Sem etiquetas
biology
a level
aqa
gas exchange
transport systems
lung disease
lungs
biology
exchange and transport systems
a-level
Mapa Mental por
Alex Lyes
, atualizado more than 1 year ago
Mais
Menos
Criado por
Alex Lyes
quase 8 anos atrás
42
1
0
Resumo de Recurso
Gas Exchange
Size & Surface Area
Smaller animals
High surface area
Low volume
Multicellular organisms
Need exchange organs
Diffusion too slow
Affects heat exchange
Depends on SA
Small means it is harder to loose heat
Compact shape means less SA
Gas Exchange
Fish
Counter-current
Water & blood flow in different directions
Maximises gas exchange
Concentration of oxygen in water always higher than blood
Filaments
Increase SA
Lamellae at right angle to filaments
Insects
Tracheae
Spiricles
Pores on surface
Oxygen travels down concentration gradient
Humans
Lungs
Trachea
C-shaped cartilidge
Supports and stops collapsing
Bronchi
Bronchioles
Alveoli
Thin exchange surface
Short diffusion pathway
Speeds up rate
Large SA
Large number of alveoli
Surrounded by capillaries
Maintains concentration gradient
Inhalation
Internal relax
External contract
Diaphragm contracts
Flattens
Exhalation
External relax
Internal contract
Diaphragm relax
Effects of lung disease
TB
Reduces tidal volume
Gas exchange surface damaged
Can cause fibrosis
Fibrosis
Formation of scar tissue
Less recoil
Reduced FEV
Asthma
Inflamed airways
Large amounts of mucus
FEV reduced
Emphysema
Inflammation
Break down of elastin
Less recoil
Anexos de mídia
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