Triple Hormones Flashcards
(18 cards)
Compare the endocrine system with the nervous system.
The endocrine system is slower but acts for longer
What is the pituitary gland ?
The master gland in the brain that secretes several hormones into the blood in response to body conditions. These hormones act on other glands, making them release other hormones.
\What does testosterone do when a male hits puberty ?
Causes the production of sperm.
What does oestrogen do when a female hits puberty ?
Changes body composition.
What four hormones regulate the menstrual cycle ?
LH, FSH, Oestrogen and Progesterone
How does FSH affect the body ?
It stimulates oestrogen production and the growth of follicles (egg-sacs) in the ovary.
How does LH affect the body ?
It stimulates the release of an egg.
How does Oestrogen affect the body ?
The oestrogen causes growth and repair of the lining of the uterus.
How does Progesterone affect the body ?
The progesterone maintains the uterus lining.
What hormones can be used to try and treat infertility ?
FSH and LH can be injected to stimulate ovulation.
Describe In Vitro Fertilization.
IVF involves giving a mother FSH and LH to stimulate the maturation of several eggs.
The eggs are collected from the mother and fertilised by sperm from the father in the laboratory.
The fertilised eggs develop into embryos.
At the stage when they are tiny balls of cells, one or two embryos are inserted into the mother’s uterus (womb).
What are the ethical and moral issues with IVF ?
it is very emotionally and physically stressful
the success rates are not high
it can lead to multiple births which are a risk to both the babies and the mother.
Where is adrenaline produced and what does it do ?
Adrenaline is produced by the adrenal glands in times of fear or stress. It increases the heart rate and boosts the delivery of oxygen and glucose to the brain and muscles, preparing the body for ‘flight or fight’.
Where is thyroxine produced and what does it do ?
Thyroxine from the thyroid gland stimulates the basal metabolic rate. It plays an important role in growth and development.
What is negative feedback ?
A negative feedback control system responds when conditions change from the ideal or set point and returns conditions to this set point.
What do gibberellins do, and what can they be used for ?
Gibberellins are important in initiating seed germination. Gibberellins can be used to:
end seed dormancy
promote flowering
increase fruit size.
What does ethene do and what can it be used for ?
Ethene controls cell division and ripening of fruits. It is used in the food industry to control ripening of fruit during storage and transport.
What can Auxin be used for ?
Auxins are used:
as weed killers
as rooting powders
for promoting growth in tissue culture.
