Unit B - Reproduction & Development Flashcards
Which germ layer does the fetal digestive tract form from?
Endoderm
Which female reproductive hormone stimulates prolactin secretion and inhibits the growth of facial hair?
Estrogen
The process whereby a single cell divides twice to produce four cells containing half of the original genetic information is called?
Meiosis
What is one thing that makes the reproductive system different than others?
It becomes functional at puberty.
A gamete js a haploid cell made during _____ that participated in fertilization to create a _____.
Meiosis, zygote.
The smallest cell in a human body is a _____ cell.
Sperm
The male reproductive gamete is the _____, and the female reproductive gamete is the _____.
Sperm, egg.
Each sperm cell contains how many chromosomes?
23
Name the three parts of a sperm, and their functions.
- Oval head w/ across one covering container chromosomes.
- Cylindrical middle contains mitochondria to produce energy.
- Tail, to provide motility.
Which hormone initiates the development of sperm cells?
FSH
Where is sperm produced, specifically?
In the seminiferous tubules of the testes.
Where do sperm cells reach maturity and finally become mobile?
Epididymus
Through why structure do the speed leave the epidiymus and travel to the urethra?
Vas deferens
What is added to the sperm in the vas deferens, and what is it called altogether, and what is its function?
Seminal fluid, semen.
It is alkaline to protect the sperm from acidic environments and contains food for survival.
What are the three male accessory glands called?
- Seminal vesicles
- Prostate gland
- Cowper’s gland
Name the gonads of the male and female reproductive system.
The testes and the ovaries.
What are the components of primary sex characteristics?
Structures: glands, ducts and gonads.
What hormone stimulates the production of testosterone?
LH
What cells are responsible for the production and growth of sperm cells?
Sertoli cells
Testosterone is secreted by the _____ cells in the seminiferous tubules.
Interstitial
Gametogenesis is the _____ phase of germ cells.
Maturation.
What are the specific names for gametogenesis in males and females?
Spermatogenesis, oogenesis.
What kind of lifestyle conditions contribute negatively to sperm production?
Smoking, alcohol, stress, nutrition, exercise, and drug use.
Name a few distinctively male secondary sec characteristics (six)?
- Facial hair
- Body hair
- Deeper voice
- Broader shoulders
- Narrower hips
- More obvious muscle development
Sertoli cells produce which hormone that prevents excessive sperm production?
Inhibit, inhibits GnRH.
Minimal body and facial hair, prominent breasts, a higher voice, more rounded shoulders and wider hips are indicative of what?
Female secondary sex characteristics.
What are the three main functions of the ovaries?
- Produce and mature eggs.
- Produce sex hormones.
- Site of ovulation.
Where does fertilization of an oocyte occur?
The Fallopian tubes.
After producing and releasing an egg in ovulation, the follicular becomes the _____ _____.
Corpus luteum.
If implantation occurs, what is the function of the corpus luteum?
Produces sex hormones to maintain the uterus’ lining.
The lining of the uterus, the _____, is developed by the hormone _____ and maintained by the hormone _____.
Endometrium, estrogen, progesterone.
At puberty, the hypothalamus begins producing _____ which stimulates the pituitary gland to release both _____ and _____.
GnRH (gonadotropin releasing hormone), FSH and LH.
How long do ova survive after ovulation?
~24 hours
What is the female equivalent of the Sertoli cells in the female reproductive system?
Follicle cells
The oven is surrounded by a large amount of _____ and is encased in a thick membrane that is penetrated by the _____ of a sperm’s acrosome (cap).
Cytoplasm, enzymes.
Why can’t more than one sperm penetrate the egg’s corona radiata?
Enzymes of the acrosome depolarize the membrane where they’ve digested through, so other sperm can’t bind with it.
Why is pelvic inflammatory disease (PID) so serious for women?
PID can cause a build-up of scar tissue in the Fallopian tubes, and prevent sperm from meeting and fertilizing an egg (infertility).
What are the two major types of STIs?
Viral and bacterial.
What is the most common STI in the world?
Human papilloma virus (HPV).
What are the two most common bacterial STIs?
Chlamydia and gonorrhoea.
What makes viral STIs so dangerous?
The likelihood of death is much higher, and many are incurable.
Why are bacterial STIs dangerous?
Many go easily undetected, and can become resistant to antibiotics.
To develop as a male, the testes-determining factor (TDF) of the sex-determining region-Y part of a Y chromosome causes differentiation of supporting cells into _____ cells and _____ cells that begin to form testosterone around the 8th week of gestation, and begin differentiating into make structures.
Sertoli and interstitial cells.
In cells with two X chromosomes, one is inactivated and is called a _____ body, which appears as a dark stained structure in the nuclear envelope.
Barr
Which hormone stimulates the production of FSH and LH?
GnRH
What is the function of FSH in the male reproductive system?
Stimulates development of sex organs and gamete (sperm) production.
What is the function of LH in the male vs female reproductive systems?
Male: stimulates testosterone production.
Female: stimulates ovulation.
What are three functions of estrogen?
- Stimulates production of female reproductive organs.
- Stimulates secondary sex characteristics.
- Develops the endometrium.
What are two functions of progesterone?
- Causes uterine thickening.
2. Prevents uterine contractions.
What are the four phases of the female reproductive cycle (in order)?
- Flow phase
- Follicular phase
- Ovulation
- Literal phase
The increase of estrogen produced by the follicle in the follicular phase inhibits the release of _____ and triggers the release of _____, which causes LH to spike and _____ to occur.
FSH, GnRH, ovulation.
Once the ovum is released, in the _____ stage, LH causes the follicle to turn into the _____ _____, and the production of _____ increases.
Luteal, corpus luteum, progesterone.
If the egg is fertilized before implanting, it begins to produce _____ in order to maintain estrogen and progesterone production.
Human chorionic gonadotropin hormone (hCG).
The process between the fertilization of an egg and the beginning of childbirth is called?
Gestation
Weeks 1-8 after fertilization are known as which phase of gestation?
Embryonic development.
Weeks 9-38 are known as which period of gestation?
Fetal development.