BI0 02 Lesson 2: Male Reproductive System

REPRODUCTIVE SYSTEM

• AKA "genital system"

• is a system of sex organs within an organism which work together for the purpose of sexual reproduction

Testes

Ducts

Accessory Glands

Supporting Structures

Parts of Male Reproductive System

Testes

- Primary reproductive organs of the male

-have both exocrine gland & endocrine gland functions

-As an individual reaches puberty, the testes start to produce functional sperm cells under the influence of hormones of the pituitary gland

Ducts

Tubes that lead from a gland to a target organ

Epididymis

-Tightly coiled tubes

-"Maturation of sperms happen"

-Maturation leads to formation of tail for motility

Vans Deferens

-passageway of sperm

-End of epididymis (tail) and ends the ejaculatory duct which unites with the urethra

Seminal Vesicle

-Found behind & beneath the urinary bladder, contribute most the fluid and produce yellowish secretions:

-FRUCTOSE

-PROSTAGLANDINS

FRUCTOSE

(sugar that supplies energy for sperm)

PROSTAGLANDINS

(stimulate contraction reproductive tract allowing the sperm to move easily)

Accessory Gland

Produce secretions that support gametes.

Prostate Gland

A walnut-sized that secretes alkaline milky fluid that helps the sperm to swim and activate

Bulbourethral Gland

-AKA "Cowper's Gland"

-Lubricates the urethra, helps neutralize the acidity of urethra and reduces the acidity of female's vagina

-Secretes clear fluid

SEMEN

All combined secretions from the 3 accessory glands, together with the sperm cells, make up a milk white substance

EJACULATION

Smooth muscle contraction help propel the semen out from a penis in a forceful expulsion of sperm outside the body

300 to 400 million sperm

A single ejaculation can contain _________________

Premature

Retarded

Retrograde

3 Types of Ejaculation

Premature (Early) Ejaculation

- most common ejaculation problem. It is where the male ejaculates too quickly during sexual intercourse.

Retarded Ejaculation

- a delay in achieving ejaculation, or an inability to achieve ejaculation during sexual activity, even though the male wants to & his erection is normal

Retrograde Ejaculation

- rarer type of ejaculation problem. It happens when sperm travels backwards and enters the bladder instead of coming out of the end of the urethra

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PENIS

-Deposit sperms into the vagina during copulation

-Is highly vascularized, if cut, results severe bleeding

CIRCUMSION

surgical removal of the foreskin

SCROTUM

-Sac of skin that holds and protects the testis

-keeps the testes 3°C lower than the core body temperature (needed for sperm production)

When it's hot, the___________ relaxes and the testicles settle lower, when it's cold, they rise up and are held close to the body