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Chapter 16: Human Sexual Reproductive System - Coggle Diagram
Chapter 16: Human Sexual Reproductive System
Sexual reproduction
Many organisms reproduce sexually.
This means their young are formed when the nuclei of two sex cells join together. The sex cells in humans are an egg cell and a sperm cell.
The fusion of sex cells is called fertilisation. When an egg cell is fertilised, it develops into an embryo and develops into a new individual. This new individual contains the genetic material (DNA) from both its parents.
Heredity
The passing down of genetic material from one generation to the next during sexual reproduction is
called heredity.
Family Resemblance & Variations
Children inherit mix traits or chacteristics from their parents.
During sexual reproduction, the individual receives genetic material from the mother via the egg,
and from the father via a sperm.
Inheriting any trait is a random process. They can get mix traits of both their parents.
The genetic traits that are passed down can be desirable, undesirable or neutral to the next
generation. Thus, any disorders or diseases can be passed down from parent to offspring.
Boys
• Height and weight increases
• Armpit hair growth
• Pubic hair growth
• Facial hair growth
• Voice-box enlarges and voice deepens
• Muscle strength increases
• Penis and testes increase in size
• Production of sperms and ejaculation occurs
Girls
• Breasts begin to develop and uterus enlarges
• Hips become broader and rounder
• Maturation of eggs and menstruation begins
Male reproductive system parts
Scrotum: Holds the testes outside body
Testis: Produces sperm & male hormones
Male sex glands: Secrete fluid containing nutrients and enzymes. Fluid provides sperms with energy to move