biology -hormones and the menstrual cycle cb7 p2 Flashcards
what is a hormone
a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.
what do hormones do
communicate with the body by heading towards their target cell to bring about a particular change or effect to that cell
how are hormones removed from the body
by sweat and urine
what type of organ secretes hormones
endocrine gland
name 2 hormones where they are found and where they are produced
testosterone - in the testes
oestrogen- in the overies
what is flight or fight response and why is is important
an automatic physiological reaction to an event that is perceived as stressful or frightening
why do pupils get larger during fight or flight response
the nervous systems is linked to the pupils
what is metabolism
is the chemical reactions in the body’s cells that change food into energy
what is the role of
LH
LSH
oesterogen
progesterone
LH-triggers the creation of steroid hormones from the ovaries
LSH- stimulates follicular growth and ovulation
OESTROGEN- plays a role in ovulation (when your ovaries release an egg) and thickens the lining of your uterus (endometrium) to prepare it for pregnancy.
PROGESTERONE- get your body ready for pregnancy
how long does a cycle last
28-30 days
which hormones control the menstrual cycle
LH
FSH
estrogen
progesterone
why does the uterus lining thicken
to prepare for implantation
which hormone controls metabolism
Thyroid hormone
what happens during menstruation cycle
-days 1-5 menstruation
-oestrogen causes the lining to build up
-FSH causes folide to mature
-14-24- ovulation
-progesterone levels rise to maintain the lining
-28 if egg is not fertilised goes back to day 1
