Chapter 17: Reproduction in Humans Flashcards
1
Q
Parts of male reproductive system
A
- Testis
- Scrotum
- Sperm duct
- Prostrate gland
- Urethra
- Penis
2
Q
Testis
A
- there are 2 testes
- each produces sperm
- each produces male sex hormones such as testosterone
- male hormones responsible for development and maintenance of the secondary sexual characteristics of males
3
Q
Scrotum
A
- testes lies between thighs
- both testes lie in a pouch-like sac called the scrotum
- outside the main body cavity 👉 it is at a slightly lower temp than body temp, which is essential for sperm to develop properly
4
Q
Sperm duct
A
- each sperm duct loops over a ureter and then opens into the urethra
- after the sperm are released from the testis, they travel through the sperm duct
5
Q
Prostate gland
A
- at the base of the urinary bladder, where the 2 sperm ducts join the urethra
- secretes a fluid which mixes with the sperm
- the fluid contains nutrients and enzymes which nourishes the sperm and stimulate it to swim actively
- the mixture of fluid and sperm is the semen
6
Q
Urethra
A
- a tube that passes from the bladder through the centre of the penis to the outside of the body
- both semen and urine pass out of the body through the urethra
7
Q
Penis
A
- an erectile organ
- enters the vagina of the woman during sexual intercourse to deposit semen
8
Q
Structure of sperm
A
- Sperm
- Head
- Middle piece
- Tail (flagellum)
9
Q
Sperm
A
- the male gamete
- numerous sperm are produced throughout the life of a male after he has physically matured
- about 60µm long
10
Q
Head
A
- about 2.5µm wide
- contains a large nucleus with a small amount of cytoplasm
- nucleus carries a haploid set of chromosomes
11
Q
Middle piece
A
- contains numerous mitocondria
- mitochondria provides energy for the sperm to swim towards the egg
12
Q
Tail (Flagellum)
A
- the beating movement of the tail or flagellum enables the sperm to swim towards the egg
- the tail the sperm to be motile (able to move)
13
Q
Female Reproductive System
A
- Ovary
- Oviduct
- Uterus
- Cervix
- Vagina
14
Q
Ovary
A
- 2 ovaries produces ova(eggs)
- also produces hormones such as oestrogen & progestrone
- female sex hormones are responsible for development and maintenance of the secondary sexual characteristics of females
- when the egg become mature, they are released from the ovaries
15
Q
Oviduct
A
- each ovary releases mature eggs into an oviduct
- each oviduct is a narrow, muscular tube leading from the ovary to the uterus
- has a funnel-like opening lying close to the ovary which makes it easier for the egg to enter the oviduct
- egg is usually fertilised in the oviduct
- inner surface of the oviduct is lined with cilia
- movement of cilia helps to move the egg along the oviduct
16
Q
Uterus
A
- where the fetus develops during pregnancy
- shaoed like an upside down pear
- has elastic muscular walls. the smooth muscle tissue in the walls of the uterus contract to push the fetus out during birth
- the soft, smooth inner lining of the uterus is called the uterine lining, which is where the embryo is implanted
17
Q
Cervix
A
- ring of muscles at the lower portion of the uterus where it joins the vagina
- the opening of the cervix allows menstrual blood to flow out of the vagina during menstruation