Topic 5 Homeostasis and response Flashcards
What is homeostasis?
The maintenance of a contsant internal enviroment.
What does the human body control?
Blood glucose conc.
Body Temp
Water levels
Different stages of the CNS
stimulus → receptor → coordinator → effector → response
What does the Human Endocrine system do?
Controls the release of hormones.
Pituatiry gland is …
master gland
Thryroid gland secretes …
Thyroxine
Ovary gland secretes …
Oestrogen
Adrenal gland secretes …
Adrenaline
Testery gland secretes …
Testosterone
Pancreas secretes …
Insulin
Type 1 diabetes is
When the pancreas doesn’t produce enough insulin
Type 2 diabetes is
Body cells don’t respond to insulin
What does the pancreas produce?
Produces glucagon and glucagon binds to liver cells forms glycogen stored glucose released into the blood.
Explain the menstrual cycle.
FSH breaks down uterus lining
Oestrogen builds up sitmulates release of LH inhibits release of FSH
LH results in ovulation inhibits release of oestrogen.
Progesterone maintains lining of the uterus inhibits release of LH
List non hormonal methods of contraception.
Condoms (may tear)
Spermitcides kill sperm
Diaphragm plastic up over cervix used with spermicide.
Abstaining
List hormonal methods of contraception.
Mixed pill of progesterone and oestrogen inhibits relase of FSH lot of side effects: increase breats pain/ breast enlargementetc.
Progesterone only pill less side effects
Contraceptive injection lasts 2-3 months
Contraceptive implant lasts 2-3 years prevents ovaries releasing egg.
Contraceptive patch lasts 1 week oestrogen and progesterone.
IUD T shape in uterus
Explain IVF
Given LH and FSH. Eggs are taken and injected with sperm cells and are fertilised. Then devleoped inot 2 or 3 embryos. implanted into womens uterus.
Name an adv. of IVF
Allows infertile parents to have children
Name a dis. of IVF
Success rate is 26%
Can be emotiionally stressful if doens’t work
Can be physically stressful can become sick with hormones
Harmful to mother and babies if multiple births.
Expensive if needed to be repeated.
What does adrenaline cause?
Fight or flight response from adreanl galnd in times of stress. Increases BR and HR to allow more oxygen to brain and muscles for respiration.
Pupils dilate for more light
Increase blood flwo to muscles
More glucagon converts to glucose
Decrease blood flow to digestive system
