coordination of responses+ heart rate- animal responses

Question 1

2 main coordination systems in the body

Answer 1

-nervous and endocrine system
-sympathetic nervous = fight or flight, supported by adrenaline and cortisol

Question 2

mechanism of fight or flight

Answer 2

-sensory neurones send impulses to brain
-amygdala sends impulses to other parts of brain ie hypothalamus
-hypothalamus sends impulses via sympathetic nerves to adrenal glands=adrenal medulla secretes adrenaline which stimulates target organs and tissues to increase sensory awareness
-at same time, hypothalamus releases a peptide hormone which stimulates the anterior pituitary gland to release ACTH
-ACTH transported to adrenal glands via bloodstream
-causes adrenal cortex to secrete cortisol= blood pressure and glucose increases

Question 3

effects of adrenaline

Answer 3

-increases diameter of bronchioles = increased airflow
-increases amount of blood flowing to brain and muscles by vasodilation
-heart rate and stroke volume increase
-stimulates the breakdown of glycogen into glucose in the liver cells via enzymes, causing blood glucose conc to increase