Download Reproductive System

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Transcript
Human Reproduction
Reproduction – is the formation of
new individuals.
 The reproductive system
produces, stores, and
releases specialized sex
cells called gametes.
These specialized cells
are make it possible for
the fusion of sperm and
egg to form a zygote.
 Puberty – is a period of
rapid growth and sexual
maturation during which
the reproductive system
becomes fully functional.
Female Reproductive System
 Ovaries – two almond
sized structures
where the egg cell is
produced.
 Follicle – a cluster of
cells that surround,
protect, and nourish a
developing egg cell.
 Oviduct (fallopian
tube) – narrow tube
which serves as the
passageway to the
uterus.
Female Reproductive System
 Uterus – a hollow,
muscular organ
with thick walls.
 Cervix – connects
the vagina and
uterus.
 Vagina – is a
flexible, thin walled
organ which is
responsible the
receiving the penis
and sperm during
intercourse.
Ovarian Cycle
 During the ovarian
cycle, an egg
develops and is
released from the
ovary.
 Ovulation – When
a follicle has fully
matured, its egg is
released in a
process called
ovulation.
Ovarian Cycle
 When Estrogen
levels are low, the
pituitary gland
releases FSH which
causes a follicle to
mature.
 A sudden rush of
FSH and LH cause
the follicle to
release a egg.
Menstrual Cycle
 The menstrual cycle is
controlled by
hormones that are
controlled by negative
feedback mechanisms.
 Estrogen and
progesterone are
released by the ovary
and cause the lining of
the uterus
(endometrium) to
thicken.
 If fertilization does not
occur, less estrogen in
the blood cause the
Fertilization
Fertilization
 Fertilization must occur within the
first 48 hours of ovulation.
 As soon as fertilization occurs, a
zygote is formed.
 As the embryo travels down the
fallopian tube, it divides by the
process of mitosis (cleavage).
 Implantation occurs on Day 8 or 9
after fertilization.
Male Reproductive System
 Testes – area in which
sperm is made.
 Scrotum – sac like
structure that holds the
testis.
 Epididymis- a long thin
coiled tube in which
sperm complete there
development and are
stored.
 Semen – fluids that are
released with sperm
that aid in its survival.
 Vas Deferens – a tube
that brings sperm from
the epididymis out
through the urethra.
Sperm Cells
 A sperm cell
consists of
 a head, which
contains a nucleus.
 Midpiece, which
contains millions of
mitochondria.
 Tail which is used
for movement.
Release of Sperm
 Glands lining the reproductive tract –
including the seminal vesicles, the
prostate, and the bulborethral gland
produce nutrient rich fluid called
seminal fluid.
 Approximately 2.5 million sperm are
found in one drop of semen! Why so
many?
Document related concepts

Cell encapsulation wikipedia, lookup

Plant reproduction wikipedia, lookup

Sexual reproduction wikipedia, lookup

Somatic cell nuclear transfer wikipedia, lookup

Mating of gastropods wikipedia, lookup