Co-ordinated responses Flashcards Preview

Biology > Co-ordinated responses > Flashcards

Flashcards in Co-ordinated responses Deck (19):
1

What is role of fight or flight response

To increase heart rate to pump more oxygenated blood

2

What happens to body when autonomic nervous system change from parasympathetic to sympathetic

Heart rate up

Dilate pupil

Blood glucose rise

Smooth muscle relax - wide air ways

3

What does CRF hormone do

Cause pituitary to release ACTH

4

Where is CRF released from

Hypothalamus

5

What does ACTH do

cause adrenal cortex to release adrenaline and noradrenaline

6

What is secondary messenger model

When hormone receptor complex cause enzyme to convert ATP to cyclic AMP which activates other enzymes

7

What type of reaction does adrenaline cause

Cascade

8

What does adrenaline cause

Adrenaline bind to liver cells

Activate adenyl cyclase

Trigger ATP to cyclic AMP

increase in cAMP activate protein kinases which activate more enzymes

Enzymes turn glycogen to glucose

9

What is the flight and fight an interaction

Neuronal and hormonal response

10

What is heart rate controlled by

The automatic nervous system - medulla oblongata which links to sino atrial node

11

Where is an impulse sent to increase heart rate

SNS and accelerator nuerone

12

Where is an impulse sent to decrease heart rate

Through peripheral nervous system and vagus nerve

13

What is a baroreceptor

Detects pressure in blood vessels

Aorta

Vena Cava

cartoid artery

14

What is chemoreceptors

detect change in chemicals like CO2

In medulla

Aorta

Cartoid artery

15

If there is low CO2 what happens to pH

pH rises

16

What happens if CO2 levels drop

Detected by chemoreceptors

Reduce frequency to medulla

Reduce frequency to SAN

Reduce heart rate so CO2 isnt removed fast

17

What happens if there is high blood pressure

Detected by baroreceptor

Impulse sent to medulla

Impulse sent to PNS

Impulse sent to SAN to decrease heart rate

18

If blood pressure is low where would an impulse be sent

SNS

19

If blood pressure high where would impulse be sent

PNS