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

Biology virtual period: Reflex arcs

Read page 5 from HERE.

  • Act: Answer the interactive question and post a scrrenshot with the answers.
  • Film 2 examples which show reflex actions. (BE CAREFUL IN USING HOT OBJECTS! MIMICS ARE ACCEPTED!)

For each example, name the structures involved:

stimulis __  receptor __coordinator __effector __ response

?                     ?                        ?                          ?             ?

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

The eye as a sense organ


Study the structure and functions of the human eye HERE, and complete pages 9 and 10 from the booklet.


Watch the video!

Booklet Act: COMPLETE questions 4 c and d on page 10.



  • In pairs,  add a video which shows the pupil reflex in your eyes.
  • Using your reflex actions´knowledge , sketch the sequence of the pupil reflex. State the stimulus, receptors, coordinator, effector, effect, response and all the neurones involved.
  • What is the importance of this reflex?
  • Booklet act: COMPLETE questions 1 b and c on page 9.


  • Play this animation about focusing a close or distant object and answer the interactive questions.
  • Booklet act.: Answer questions 2 and 4 a and b.


Let´s discuss about them HERE!

Connections between the nervous system and the eye as a sense organ.

Booklet act: Answer question 5 on page 10.



Publicado en Senior 4 Biology - 2018 | Deja un comentario

Biology virtual period: Nervous system: neurones and synapse

Let´s start a new topic!

All mammals have a CENTRAL NERVOUS SYSTEM and a PERIPHERAL NERVOUS SYSTEM. The CNS is made up of the brain and the spinal cord. The peripheral nervous system is made up of nerves and receptores.

The NEURONES are special cells which coordinate the messages travelling through the nervous system.

  1. ANATOMY OF A NEURONE: Watch THIS video!
  • Act: State how the structure of a neurone is related to the function.

2. TYPES OF NEURONES: Read “overiew of neurone structure and function   from HERE  .

  • Act: Make a labelled drawing of each of the three types of neurones, motor, sensory and relay, and state their functions.


  • Act: Post a short video explaining synapse.
  • Act: Describe in your own words how nerve impulses are transmitted from neurone to neurone.
Publicado en S4 Biology virtual period- 2018 | Deja un comentario

Endocrine system: adrenaline and ADH

Let´s continue studying hormones…

  1. Study the effects of adrenaline and ADH after reading this link.

Act: a- Use bullet points to summarise the effects of adrenaline.

b- Describe 3 situations in which adrenaline is secreted. Post a picture to show the examples.


2. Draw a flow chart to show the effects of ADH:

– when there is TOO LITTLE WATER in the body.

– when there is MUCH WATER in the body.


3- Solve the quiz from this webpage. Take a screenshot and post it.

Good luck! 🙂


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