Reproduction in humans: male reproductive system

Structures and functions

Take a look at THESE slides.


Publicado en Senior 4 Biology - 2018 | Deja un comentario

Transport in humans

A multicellular organisms , such as a person,  needs a transport system to move substances around the cells. In the human body, a transport system consists of:

  • The heart
  • Blood vessels: arteries, veins and capillaries
  • Blood: components and functions


The heart and circulation

  • Read pages 4 and 5 from THIS LINK and play the animations.
  • How does the heart work? Watch the video!

  • INVESTIGATING HEART DISEASE: click on THIS LINK to learn about the angiogram and the ECG.

Blood vessels

  • Let´s learn more about arteries, veins and capillaries.

The structure of each of them is related to the function.



  • Take a look at the worksheet we did in class and click on THIS link!

Enjoy! 🙂


Publicado en Senior 3 Biology - 2018 | Deja un comentario

Biology Virtual Period: chromosomes and mitosis


In this period we are going to learn about the continuity of life. You may have heard words like DNA, genes, inheritance, chromosomes, cell division…. let´s investigate what all these is about!

Watch the video !


1- a- Make a drawing of a body cell which contains one chromosome.

b- Make a drawing of a body cell which contains one chromosome before cell division.

Explain the difference between them.

2- Explain the difference in the number of chromosomes between a body cell and a gamete.


Watch THIS video about mitosis.

1- Make a drawing of a cell with 2 chromosomes.

2- Make a drawing of the same cell before cell division.

3. Make a drawing of the daughter cells.

4- Name examples in which mitosis takes place in the human body.



Publicado en S4 Biology virtual period- 2018 | Deja un comentario

June 5th: Environment Day

We are celebrating the Environment Day!



Click on THIS LINK!


  • What is the UN?
  • What is the link between the UN and the Environment?
  • What are the Sustainable Development Goals?
  • Goals 6,7, 11, 12, 13, 14 and 15.
Publicado en S4 Biology lab work 2018, Senior 4 Biology - 2018 | Deja un comentario

Enzymes and digestion

Enzymes and digestion


Publicado en Senior 3 Biology - 2018 | Deja un comentario

S4 Virtual period: Male reproductive system

Let´s start to study reproduction.

Living organisms reproduce sexualy or asexualy. Therefore, we say that there are two types of reproduction.

  1. Act: Use information from the text book to build a comparison table between sexual and asexual reproduction.

Humans reproduce sexualy.

2.  Watch this video to learn about the MALE REPRODUCTIVE SYSTEM.

3. Act: Summarize the functions of each of the organs which are part of the male reproductive system. Take a look at THESE SLIDES !

4. State the components and the function of semen.

5. Make a large labelled drawing of a sperm cell and state how the structure is adapted to its function. (Do not add a picture).

Publicado en S4 Biology virtual period- 2018 | Deja un comentario

Control of body temperature: Heat loss and size

Read the article and explain the relationship between heat loss and animal size.

Publicado en S4 Biology lab work 2018 | Deja un comentario

Drugs: effects of “paco” in the brain.

April 26th, 2018

Dr. Marcelo Cetkovich from INECO Foundation explains the effect of Paco in young children.

Publicado en News!, Senior 4 Biology - 2018 | Deja un comentario

Sex hormones and puberty

Sex hormones are responsible of the most dramatic changes that occur in the body. They control puberty, egg and sperm production, pregnancy, birth and lactation.

  1. Read the information about Puberty HERE.
  2. State the female and male hormones which are responsible for the development of the secondary sexual characteristics
  3. Build a comparison table between the changes that occur in male and female after puberty.
  4. Search in the internet and summarize the site of production and effects of the following sex hormones:

– FSH, LH, oestrogen, progesterone, oxytocine, Hcg, prolactine and testosterone.

5. The chart shows the ages at which the changes associated with puberty take place in boys and girls. Answer questions a, b, c, d and e.

(a) What is the most common age at which boys undergo the changes of puberty?

(b) If a girl had not started menstruation by the age of 15, would this be cause for concern?

(c) Which two features of puberty show the greatest range in the times at which they  occur.


(d) Is it unusual for a girl of 9 years to start her menstrual periods?

(e) On average, is it boys or girls who first show the onset of puberty?


Publicado en S4 Biology virtual period- 2018 | Deja un comentario


Enzymes are proteins that act as biological catalysts.

Let´s learn more about enzymes.   Watch the video!

Make sure to understand the meaning of the following key words:

  • catalyst
  • substrate
  • product
  • chemical reaction
  • active site
  • denaturation
  • temperature
  • Ph
  • Line-graph –
  • Independent and dependent variables

Why temperature control matters?

Click HERE ! Read the information and play all the animations.

ENZYMES ARE SPECIFIC. Take a look at the slides below and build a comparison table about protease, lipase, catalase. amylase, maltase and carbohydrase. Include three columns: enzyme, substrate and products.


Publicado en Senior 3 Biology - 2018 | Deja un comentario