Download Reproductive System 1

REPRODUCTIVE SYSTEM #1
Bellringer: What do you think reproduction means?
REPRODUCTIVE SYSTEM #1
What Reproductive System #1 does…
• Works to produce sperm and deliver it to the reproductive system #2
• Sperm – sex cells that are produced by the testes and that is needed to fertilize an egg
• Eggs (ova) – sex cells produced by the ovaries that can be fertilized by sperm
• Fertilization – the process by which a sperm and an egg and their genetic material join
to create a new human life
• Reproduction – the process of producing a new human
REPRODUCTIVE SYSTEM #1
• Testes (Testicle)
• Reproductive organs that make sperm and testosterone
• Produce several hundred million sperm each day
• The 2 testes rest in the scrotum
• Scrotum - Skin-covered sac that hangs from the body
• Small muscles in the scrotum move the testes closer or farther from the body –
help regulate temperature of sperm
REPRODUCTIVE SYSTEM #1
Penis
• The reproductive organ that removes urine and releases sperm from the
body.
• Made of soft tissue and blood vessels
• During sexual activity, the penis becomes erect or firm
• Ejaculation – occurs when sperm are released from the penis after
sexual excitement
• Foreskin – a sheath of skin that covers the tip of the penis
• Circumcision – surgery to remove foreskin
REPRODUCTIVE SYSTEM #1
Epididymis and Vas Deferens
• Epididymis – tightly coiled tube where sperm mature and are stored
• Vas Deferens – a long tube where sperm mix with fluids made by three
accessory reproductive organs
REPRODUCTIVE SYSTEM #1
Seminal Vesicles
• Produce thick secretions that nourish the sperm and help sperm move easier
• Found near the base of the urinary bladder
REPRODUCTIVE SYSTEM #1
Prostate Gland
• A gland in males that adds fluids that nourish and protect sperm when the sperm
are in the reproductive system #2.
• Secretes a thin, milky fluid that protects the sperm from acid in the reproductive
system #2
REPRODUCTIVE SYSTEM #1
Testosterone
• A hormone made by the testes
REPRODUCTIVE SYSTEM #1
What happens if sperm get too hot?
• Sperm made at high temperatures are defective and cannot fertilize eggs.
What 3 parts make up the sperm? What is the function of each part?
• the head contains substances that help the sperm enter the egg.
• the mid piece contains structures that release the energy needed for the trip
through reproductive system #2.
• the tail is made of proteins that help the sperm move.
REPRODUCTIVE SYSTEM #1
How long does it take an immature sperm to mature?
• An immature sperm takes 2 – 10 days to fully mature.
What 3 organs add fluid to the sperm?
• The seminal vesicle, bulbourethral glands (Cowpers glands) and the prostate gland
What prevents urine and semen from going through the penis at the
same time?
• A flap in the urethra prevents urine and semen from going through the penis at the
same time.
REPRODUCTIVE SYSTEM #1
What are some signs that a person with reproductive system
#1 is going through puberty?
• Shoulders get wider
• The muscles get larger
• Hair grows on the face and other parts of the body
• The voice deepens
• At this time testosterone also causes the body to start making sperm
REPRODUCTIVE SYSTEM #2
List 5 things you know about the reproductive system
with a vagina and ovaries.
REPRODUCTIVE SYSTEM #2
• What Reproductive System #2 does
• The function is to make eggs and provide a place to support and
nourish a developing human
6th Grade
REPRODUCTIVE SYSTEM #2
Ovaries
– The reproductive organs that produce eggs
• Eggs (ova) – sex cells that are produced by the ovaries and can be fertilized
by sperm
• All of the eggs a person with reproductive system #2 will ever have, are in
the 2 ovaries when the person born
– Make the hormones estrogen and progesterone
• Regulates the monthly release of an egg and prepares the body for
pregnancy
REPRODUCTIVE SYSTEM #2
Vagina and Urethra
• Vagina
• Reproductive organ that connects the outside of the body to the uterus
• Receives sperm during reproduction
• Urethra
• Located above and separate from the vagina- carries urine from the bladder to
the outside of the body
REPRODUCTIVE SYSTEM #2
Fallopian Tubes and Uterus
• Fallopian Tubes
• The reproductive organs that transport an egg from the ovary to the uterus
• Uterus
• Reproductive organ that provides a place to support a developing human
• Muscular cavity the size of a fist
HOW THE MENSTRUAL CYCLE WORKS
REPRODUCTIVE SYSTEM #2
Menstrual Cycle
A monthly series of hormone controlled changes that prepare the uterine lining for a
pregnancy
• Ovulation- the release of an egg from a follicle in the ovary
• High levels of estrogen and progesterone thicken and maintain the uterine lining
• If pregnancy does not occur-estrogen and progesterone levels quickly fall
• Menstruation- breakdown and discharge of the uterine lining out of the vagina
• Usually lasts between 3-7 days
REPRODUCTIVE SYSTEM #2
Menstrual Cycle can vary
• Average cycle is 28 days
• Can vary from one individual to another and from month to month
• Ovulation usually occurs on the 14th day
• Environmental factors can influence the timing of a cycle
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Stress
Weight gain or loss
Travel
Exercise
Diet
Illness
REPRODUCTIVE SYSTEM #2
• Discussion Questions
– Describe the pathway an egg takes after it is released from an
ovary.
– Summarize the steps of the menstrual cycle.