Presentation on theme: "THE MALE REPRODUCTIVE SYSTEM. The male reproductive system is designed to: 1. produce male gametes (sperm) 2. for the insertion of viable sperm into the."— Presentation transcript:
THE MALE REPRODUCTIVE SYSTEM
The male reproductive system is designed to: 1. produce male gametes (sperm) 2. for the insertion of viable sperm into the female (intercourse) Once the sperm are inside the female they can swim to find the female egg (ovum) and fertilization takes place
The vas deferens carries the sperm from the epididymis to the urethra
The seminal vesicles produce sugars to feed the sperm on their journey to the ovum
The prostate gland produces an alkaline (opposite of an acid) solution. The alkaline solution neutralises the acid in the woman’s vagina
The bulbo – urethral gland produces a liquid containing mucus for the sperm to swim in
SEMEN Semen is a milky white fluid produced when a man ejaculates It contains: 1. Sugars from the seminal vesicles provide food for the sperm. 2. Alkaline fluid from the prostate stops the acid in a woman’s vagina from killing the sperm before they get to the egg. 3. Mucus from the bulbo - urethral gland gives the sperm s something to swim in, and helps to dilute the acid in the vagina. 4. Sperm from the testes
The testes produce the sperm and they produce testosterone
The epididymis is a tube at the end of the testes. This is where the sperm mature after the are made in the testes.
The scrotum is a skin bag surrounding the testes. It acts as a temperature control for the testes, hanging away from the body when the body is hot, and close to the body when the body is cold
The role of the penis is to enable the sperm to get into the woman’s vagina To do this it is able to become hard and erect if it is stimulated.
To enable the penis to become erect two special tissues are needed. 1. Spongy erectile tissue fills with blood and expands so the penis grows bigger.
2. Erectile muscle contracts when a man becomes sexually excited, allowing the penis to become erect
The pubic bone
The bladder stores urine till the man is ready to expel it from his body
The urethra is the tube that connects 1. the bladder to the outside of the body 2. the vas deferens to the outside of the body
This picture shows the position of the rectum relative to the man’s genitals
Summary Sperm are made in the testes They mature (and are stored) in the epididymis They travel to the urethra through the vas deferens At the urethra the sperm is mixed with the semen (the sugars, alkaline liquid and mucus) When a man become sexually excited the spongy erectile tissue fills with blood, making the penis bigger The erectile muscle contracts making the penis erect At orgasm the prostate, vas deferens and epididymis contract pushing the semen (with the sperm) out of the man’s body along the urethra. This is called ejaculation During ejaculation the bladder seals closed so that urine is not mixed with the semen