Fight or flight response revision flashcards. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Process that needs to be memorised from specification.
Fight or Flight Response: Fight or Flight Response:
Stimuli is likely auditory or visual.
The cerebral understanding of a threat activates
the hypothalamus.
This increases activity in the sympathetic nervous
system.
Adrenaline is released from the adrenal medulla
of the adrenal gland.
The hypothalamus also releases corticotropin-
releasing hormone (CRH) & thyrotropin-
stimulating hormone (TSH) which stimulate the
anterior pituitary gland to release hormones.
The anterior pituitary gland releases adreno-
corticotropic hormone (ACTH).
This stimulates the production of cortisol & many
other hormones in the adrenal cortex.
Cortisol sustains energy (releasing glucose), but it
also curbs the surge of adrenaline & turns off CRH.
Effects of The Fight or Flight Response: Effects of The Fight or Flight
Response:
Pupils dilate to let in more light (irises contract).
Arterioles in the skin contract & arterioles to
major muscle groups dilate to increase blood flow
to major muscle groups.
Blood glucose levels increase through triggering of
glycogenolysis, the glucose can be used in
respiration.
Smooth muscles of the airways relax, to allow
more air into the lungs.
Peristalsis shuts down so resources can solely be
focused on emergency functions.
Erector pili muscles in skin contract making the
hairs stand on end.
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 flcarr23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for 5,54 €. You're not tied to anything after your purchase.