Grade 12 Life Sciences - Comprehensive Puberty Summary
13 views 0 purchase
Course
Life Sciences
Institution
12th Grade
This concise and clear summary covers everything Grade 12 IEB Life Sciences students need to know about puberty. It explains the biological and physiological changes that occur during adolescence, focusing on hormone functions, male and female secondary sex characteristics, and key stages of develo...
PUBERTY
The process of physical and physiological changes (known as adolescence)
It leads to:
• The development of secondary sex characteristics
• An individual becoming capable of reproduction
How does puberty start?
The pituitary gland, under stimulation from the hypothalamus, releases gonadotropins (hormone
that stimulates gonads), which initiate puberty.
- In male puberty, interstitial-cell-stimulating hormone (ICSH) stimulates the testes to
secrete testosterone.
- In female puberty, follicle-stimulating-hormone (FSH) stimulates the ovaries to produce
oestrogen.
Male puberty Female puberty
Age - Starts from ages 14-16 - Starts from age of 11-14
- Ends around 18-21 - Ends around 17-20
Function of - Gives rise to secondary sex - Gives rise to secondary sex
characteristics characteristics
hormones
- Help prepare endometrium in the
uterus for the implantation of
embryo
Secondary sex ‣ Increased muscle mass ‣ Increased fat deposit below skin
characteristics ‣ Development of deeper voice ‣ Widening of hips and pelvis
‣ Enlargement of the penis and ‣ Development of breasts
testes ‣ Increase in height
‣ Production of sperm ‣ Development of egg and ovaries
‣ Development of sexual drive ‣ Menstruation begins
‣ Increased sweat production ‣ Ovulation - year after !rst period
‣ Increase in facial and body hair ‣ Growth of body hair
‣ Skin becomes more oily ‣ Skin becomes more oily
‣ Behavioural changes ‣ Behavioural changes
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TanyaChigs. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.14. You're not tied to anything after your purchase.
