Human reproduction Flashcards
Role of urethra.
- a tube which carries sperm through the penis during ejaculation
- urine also passes though it
role of erectile tissue.
-swells when filled with blood to make the penis erect
role of testes.
-where sperm are made
role of glands..
-produce the liquid thats added to sperm to make semen
role of sperm duct.
-muscular tube that carries sperm from testes to urethra
role of fallopian tube.
-a muscular tube that carries the ovum from the ovary to the uterus
role of uterus
-where embryo grows
role of endometrium
-lining of uterus which has a good blood supply for implantation of an embryo
What is stage one of the menstrual cycle?
-lining of uterus breaks down
What is stage 2 of the menstrual cycle
-line of uterus builds up again into a thick spongy layer full of blood vessels, ready to receive a fertilised egg
stage 3 of menstrual cycle
an egg develops and is released a ovulation
stage 4 of menstrual cycle
-the wall is maintained for around 14 days. If no fertilised egg has landed on the uterus wall by day 28, the lining starts to break down
Where is oestrogen produced and what is its role?
- produced in ovaries
- causes lining of uterus to grow
- stimulates the release of LH which causes the release of an egg
Where is progesterone produced and what is its role?
- in ovaries by the remains of the follicle after ovulation
- maintains the lining of the uterus during the 2nd half of the cycle-when it falls the lining breaks down
- inhibits the release of LH and FSH
How does the embryo develop?
- once implanted into uterus lining, placenta develops-allows the exchange of water, oxygen and waste
- the amnion membrane forms, surrounding the embryo and is full of amniotic fluid which protects the embryo
