Hormones In Humans Flashcards
Definition of hormone
A chemical substance, produced by a gland, carried in the blood which alters the activity of one or more specific target organs.
Draw diagram to identify adrenal glands, lancreas, testis, ovaries
See book
What hormone do adrenal glands secrete?
Adrenaline
What hormone do pancreas glands secrete?
Insulin
What hormone do testis glands secrete?
Testosterone
What hormone do ovaries glands secrete?
Oestrogen
From what endocrine gland does adrenaline come from?
Adrenal glands
From what endocrine gland does insulin come from?
Pancreas
From what endocrine gland does testosterone come from?
Testis
From what endocrine gland does oestrogen come from?
Ovaries
What is adrenaline?
A hormone secreted in ‘fight or flight’ situations
- When you are frightened or need to run away from danger.
- you need this hormone when the body expects imminent action and takes measures to act quickly.
- —–> when body feels like survival may be at stake
Give examples of situations in which adrenaline secretion increases.
1) extreme sport
2) roller coasters
3) scary movies
Role of hormone adrenaline
1) makes HEART beat faster so more blood can be pumped to muscles and more oxygen + glucose can be delivered to them.
2) makes LIVER convert
glycogen stores –> soluble glucose
for transport to muscles
3) BREATHING RATE increases so airways dilate to allow more oxygen to enter blood
4) BRAIN & MUSCLES are supplied with more blood as the arterioles supplying them dilate
5)OTHER ORGANS have less blood flow e.g. Intestin to allow more of resources to go to organs that are needed in response
Function of insulin
- controls blood lucus levels
- turns Glucose ———> fat + glycogen (for storage)
in liver
Function of testosterone
- sperm production
