REPRODUCTION:
The process in which parents produce new individuals.
THE HUMAN REPRODUCTIVE SYSTEM
PUBERTY: The time of life in humans when physical changes bring sexual maturity.
MALES
CHANGES IN MALES
Enlargement of the testes, sperm formation by the testes, growth of penis.
Voice breaking, hair growth, increased muscle and bone growth and strength.
Sudden increase in height and chest capacity, acne, body odour.
MALE REPRODUCTIVE SYSTEM
FEMALES
CHANGES IN FEMALES
Breasts begin to enlarge, hair growth, increase in height.
The Menstrual Cycle
If the egg is not fertilized, it will break apart. Then, the thickened lining of the uterus is shed during the menstrual period.
Widening of hips, body odour, acne, the first period.
FEMALE REPRODUCTIVE SYSTEM
PREGNANCY
COPULATION: When two individuals join together for sexual reproduction, it is more known as sexual intercourse.
The penis becoms stiff and erects, it is then inserted into the vagina.
EJACULATION: During ejactulation the penis would be rubbing against the vagina, which causes sperm to be squeezed out of the penis and deposited near the cervix.
The sperm pass through the cervix, and swim through the uterus into the fallopian tube. Most of the sperm doesn't make the journey, leaving other sperm to have a chance at finding an egg.
When they do encounter an egg, the sperm swarm all over its surface,then one sperm breaks its head into the egg, and its tail breaks off, the egg's surface immediately becomes hard, preventing any other sperm from entering. The egg is now fertilized.
IMPLANTATION: When the blastocyst burrows into the lining of the uterus.
THE EMBRYO: A child at the very early stages of development, the major organs have not been formed yet.
THE FOETUS: When the embryo has reached about 9 weeks, it becomes a foetus. By now, most of the major organs and systems have formed.
GESTATION: This is the period in which the baby develops in the uterus.
BIRTH
LABOUR: Labour is the process leading to birth, the first signs of labour are usually pain in the abodemen, caused by the uterus contracting and relaxing.
PURPOSE:
The main purpose of reproduction is to create new life, so that a species can continue to exist.
ASEXUAL REPRODUCTION: Asexual means without sex.
TYPES OF ASEXUAL REPRODUCTION
PARTHEOGENESIS: Offspring develop from eggs that have not been fertilised.
BUDDING: When the offspring grows from part of the parent's body and detaches.
FISSION: Reproducing by splitting into two.
SEXUAL REPRODUCTION: Usually requiring two parents.
FERTILIZATION: When sperm from a male enters an egg from a female and fertilizes it.
EXTERNAL FERTILIZATION: Fertilization outside the body. Usually happens in water.
INTERNAL FERTILIZATION: Happens inside the body, all land animals use internal fertilization.