Chemical Coordination Flashcards
What is a gland
A gland is an organ that secretes substances
Two types of gland
Exocrine and endocrine
Exocrine
Secretes product through duct or tube
Endocrine
No duct or tube so they secrete it into the blood stream
Nervous system
Works by nerve impulses
Nerve impulses travel fast instant response
Response shorter
Act upon individual cells
Endocrine system
Works by hormones transmitting through blood
Travel slowly & take longer to react
Response longer
Widespread affect
Pituitary Gland
Follicle Stimulating Hormone - Egg/sperm develop
Luteinising hormone LH - Egg release, testosterone
ADH - Controls water
Growth Hormone GH - Speed up growth
Thyroid
Thyroxin-Metabolic rate
Pancreas
Endocrine and Exocrine gland
Insulin Lowers blood glucose
Glucagon Raises blood glucose
Adrenals
Adrenaline Prepares for activity
Testes
Testosterone Secondary sexual characteristics
Ovaries
Oestrogen Secondary female characteristics
Progesterone Menstrual cycle
Why/Where is adrenaline released
Frightened, angry, excited to prepare for action
Adrenal gland
What happens - Adrenaline 7
Pupils dilate - Visual sensitivity to movement
Breathing faster - Taking more oxygen
Heart faster- More blood/oxygen to the muscles
Hair on ends - Makes it look larger
Glucose is released - Muscles use for respiration
Blood diverted - Away from intestine to muscles
Mental awareness increase - Faster reaction
Where is glucose stored
Liver and insulin stimulates liver cells to convert it into glycogen.
