Resumen
Summary Insect and fish gas exchange A level biology
- Grado
- Institución
Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
[Mostrar más]Vista previa 1 fuera de 1 páginas
Vista previa 1 fuera de 1 páginas
Añadir al carrito
Añadir al carrito
Vendedor
Seguir
arabellasherratt
Vista previa del contenido
Insect and fish gas exchange summary notes05 December 2022 11:11
Insect tracheal system
- Increased SA required for gas exchange conflicts with conserving water as water
evaporates
- Overcome water loss by trachea - internal network of tubes
Tracheal system
- Have strengthened rings to prevent them from collapsing
- Have tracheoles- smaller dead-end tubes- extend throughout all body tissues of an ins
provide short diffusion pathway from tracheole to any body cell
- Have tiny pores called spiracles on body surface- open and closed by valve
- When spiracles are open water vapour can evaporate - so spiracles often closed to
prevent water loss
Movement in the system:
1. Along diffusion gradient- oxygen is used in respiration so concentration of oxygen in t
end of the tracheoles falls- creates a diffusion gradient
- Carbon dioxide is produced by cells during respiration- diffusion gradient in opposite
direction
2. Mass transport- contraction of muscles squeezes the trachea which enables mass
movements of air
3. Ends of tracheoles are filled with water- muscle cells around tracheoles may carry out
anaerobic respiration during high activity- produces lactate which is soluble and lower
the water potential of the muscle cells (more negative)- therefore water moves into th
cells from the tracheoles (less negative) by osmosis. Water in tracheoles decreases in
volume so draws air further into them
- Final diffusion pathway is in a gas rather than liquid phase- more rapid diffusion- great
water evaporation but increased rate of air movement
Limitations:
- Relies on diffusion- means diffusion distance must be short- insects are small- length o
Los beneficios de comprar resúmenes en Stuvia estan en línea:
Garantiza la calidad de los comentarios
Compradores de Stuvia evaluaron más de 700.000 resúmenes. Así estas seguro que compras los mejores documentos!
Compra fácil y rápido
Puedes pagar rápidamente y en una vez con iDeal, tarjeta de crédito o con tu crédito de Stuvia. Sin tener que hacerte miembro.
Enfócate en lo más importante
Tus compañeros escriben los resúmenes. Por eso tienes la seguridad que tienes un resumen actual y confiable. Así llegas a la conclusión rapidamente!
Preguntas frecuentes
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
100% de satisfacción garantizada: ¿Cómo funciona?
Nuestra garantía de satisfacción le asegura que siempre encontrará un documento de estudio a tu medida. Tu rellenas un formulario y nuestro equipo de atención al cliente se encarga del resto.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller arabellasherratt. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for 5,55 €. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
45,681 summaries were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now