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Sperm
male sex cell, forms in a testis
Eggs
Female sex cell, form in ovaries
internal fertilization
Process in which eggs are fertilized inside the female's body
external fertilization
The process by which the female lays eggs and the male fertilizes them once they are outside of the female
asexual reproduction
Process by which a single parent reproduces by itself
sexual reproduction
A reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents
sexual reproduction advantages
genetic variation
asexual reproduction advantages
fast, easy, efficient, genetically identical
Hermaphroditism
A condition where both ovarian and testicular tissue are found in the same individual, they can give sperm and eggs
Fission
mitosis/ individual splits to create 2
Budding
A form of asexual reproduction of yeast in which a new cell grows out of the body of a parent.
Fragmentation
The breaking of body into two parts with subsequent regeneration
parthenogenesis
Asexual reproduction in which females produce offspring from unfertilized eggs.
How is mammalian sex determined biologically?
presence of y and X chromosomes
How is avian sex determined?
presence of Z and W chromosomes
Environmental sex determination
Sex determined by environmental factors, such as temp
"Male first"
Protandry
"Female first"
Protogyny
spawning
method of reproduction in fishes and some other animals where a large number of eggs are fertilized outside of the body
Oviparty
Eggs are laid outside the body (chickens)
Ovoviviparity
Eggs are retained in the parent
Viviparity
live birth
How are snake eggs different from bird eggs
Snake eggs are leathery and bird eggs are pure calcium
spermatheca
Specialized sac in many insects that stores sperm for later use
Cloaca
BIRDS common opening for digestive, urinary, and reproductive tracts
Why do some organisms have more than one uterus?
Produces more offspring
What purpose does the acrosome on a sperm cell serve?
allows sperm to fertilize the eggs
Testes
male gonads, produce sperm and secrete sex hormones
clitoris
structure with erectile tissue that contains a large number of sensory nerves and is a source of stimulation during intercourse
vagina
muscular tube that allows menstrual flow, a receptacle for the penis, and the birth canal.
ovaries
Glands that produce the egg cells and hormones
Scrotum
a pouch of skin containing the testicles.
Testosterone
the most important of the male sex hormones. Both males and females have it, but the additional testosterone in males stimulates the growth of the male sex organs in the fetus and the development of the male sex characteristics during puberty
penis
Male reproductive organ
seminiferous tubules
Narrow, coiled tubules that produce sperm in the testes.
Estrogen
A sex hormone, secreted in greater amounts by females
vas deferens
carries sperm behind the bladder and forms the ejaculatory duct
prostate gland
A gland in males that contributes to the seminal fluid.
ejaculatory duct
tube through which semen enters the male urethra
bulbourethral glands
A pair of exocrine glands near the male urethra. They secrete fluid into the urethra.
seminal vesicles
two small glands that secrete a fluid rich in sugar that nourishes and helps sperm move
vulva
external genitalia of the female
Cervix
The opening to the uterus, protrudes into top of vagina
oviducts
fallopian tubes, move eggs
Fimbriae
finger or fringe like projections at the end of the fallopian tubes
Uterus
Female organ of reproduction used to house the developing fetus.
What is the difference in the number of fertile cells produced in spermatogenesis versus oogenesis?
spermatogenesis produces sperm cells and oogenesis produces one ovum.
Ovarian cycle
governs the prep of endocrine tissues and release of eggs
menstrual cycle
governs prep and maintenance of uterine lining
menopause
the time of natural cessation of menstruation
birth control
prevent unwanted pregnancies
Contraception
preventing sperm and egg combining
gestation
growth process from conception to birth
parturition
act of giving birth
Zygote
fertilized egg
C-section
a surgical method of birth
Placenta
A structure that allows an embryo to be nourished with the mother's blood supply
barrier methods
Contraceptive methods that physically or chemically obstruct the travel of sperm toward the ovum. These devices do not alter body processes with drugs or devices.
hormonal methods
contraceptive methods that introduce synthetic hormones into a woman's system to prevent ovulation, thicken cervical mucus, or prevent a fertilized egg from implanting
vasectomy
bilateral surgical removal of a part of the vas deferens
spermicides
chemically destroy sperm by creating a highly acidic environment in the uterus
IUD
intrauterine device; contraceptive
Natural Family Planning
A morally acceptable way to time pregnancies based on the observation of a woman's naturally occurring times of fertility and infertility
tubal ligation
blocking the fallopian tubes to prevent fertilization from occurring
withdrawal method
a method of contraception in which the man withdraws his penis from the vagina prior to ejaculation
Infertility
the inability to conceive a child
What prevents more than one sperm from fertilizing an egg?
depolarization
Blastula
A hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals.
cleavage
rapid and multiple rounds of cell division
inner cell mass
The mass of cells in the blastocyst that ultimately give rise to the embryo and other embryonic structues
Gastrulation
a series of cell and tissue movements in which the blastula-stage embryo folds inward, producing a three-layered embryo, the gastrula.
Organogenesis
organ formation that takes place during the first two months of prenatal development
trophoblast
outer cells of the blastocyst that secrete enzymes that allow implantation
Ectoderm
outermost germ layer; produces sense organs, nerves, and outer layer of skin
Endoderm
the inner germ layer that develops into the lining of the digestive and respiratory systems
Mesoderm
middle germ layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems
homebox genes
Genes that control the development of the body plan of an organism.
Pathogen
A disease causing agent
Autoimmunity
reaction of immune response to one's own tissues
host
An organism on which a parasite lives.
zoonotic disease
disease that can be passed between animals and humans
Allergies
Having a hypersensitivity to a substance that does not normally cause a reaction.
Vector
insects that carry/transmit diseases
What is unusual about the thymus as the person ages?
it shrinks
Describe the function of the spleen.
filters toxins from actual blood, removes dying RBCs
Why are viruses considered to be obligate intracellular parasites?
They reproduce only within a host cell
What is the role of an antigen presenting cell?
Phagocytosis of antigens
Which applies to innate defenses?
guard against any pathogens
Which applies to adaptive defenses?
mount a response against a specific pathogen
How is inflammation helpful in fighting infections?
movement of leukocytes
What do Natural Killer Cells do?
Kill virus-infected body cells
What is the function of perforin?
to make pores in target cell
How is fever beneficial to fighting infection?
can kill some microbes
What do helper T cells do?
Tell B cells to make antibodies
What do cytotoxic T cells do?
Kill abnormal and foreign cells
What do B cells do?
secrete antibodies
What is the function of antibodies?
To protect the body from pathogens (bacteria & viruses) as part of the immune system
Where do T cells and B cells mature?
T cells = Thymus
B cells = Bone marrow
naturally acquired active immunity
resulting from infection