Endocrine System

The new topic in Biology is the Endocrine System and we were to do the activities on Male’s blog:

  1. Hormone: chemical substance produced by a gland, carried by the blood, which alters the activity of one or more specific target organs.
  2. Search in the internet a picture which shows the glands which secrete  hormones in the human body.

What hormones secrete each gland:

Adrenal gland: Adrenaline
Pancreas: Insuline
Testis: Testosterone
Ovary: Oestrogen
Thymus: Thymosin
Thyroid gland: Thyroxine and calcitonin
Pituitary gland: Growth hormone
Pineal gland: Melatonin

3. ADRENALINE. State the effects of adrenaline. Chose a picture which shows a situation in which adrenaline is secreted. Explain.

Adrenaline is when you are frightened, excited or keyed up. There your brain sends impulses along a nerve to your adrenal glands, and these secrete adrenaline into the blood. The main effects of adrenaline are: Your hearts beats faster, your breathing rate increases, your pain body’s ability decreases and it causes a noticeable increase in strength and performance.

“The Border Builder” by Carol Rumens

In Literature with Luz, Jose and Delfi, we worked on “The Border Builder” by Carol Rumens and wrote up a questionnaire for our peers to answer later on. Here’s ours:

1. What does the writer think ahout borders?

2. Explain the ending of the poem.

3. Who is the persona talking to?

4. Explain what effect repetition has on the reader.

5. Explain the following quotation: “My bricks, O my genuine bricks Made of my genuine blood!”

6. How can you relate the poem to the present day?

Extracting DNA

Today we went to the lab and did an experiment on extracting DNA. This is how it got carried out:

To extract DNA from natural products

to observe the fibrilar structure of DNA.

Plastic cups – onion, banana

test tubes – Distilled water

knife – detergent

sticks – salt

a beater – ethanol

1- Cut the central part of the onion into cubes.

2- Add 3 tsp of detergent and 1 of salt in a plastic cup, and pour distilled water up to the top.

3- Mix this solution with the pieces of onion.

4- Beat all the mixture at high speed for 30 seconds.

5- Filtrate the liquid with a coffee filter.

6- Fill ¼ of a test tube with the filtrate.

7- Add some pieces of banana and mix thoroughly.

8- Add the same volume of ethanol, carefully, so that it flows through the walls of the test tube and forms a layer on the filtrate.

9- Let it rest for 2-3 minutes until a cloudy area is formed between the 2 layers.

10- Extract a network of white fibres of DNA and place it on a Petri dish.

11- Add few drops of blue methylene and record your observations.

Record your observations!

a- Where in the cell is the DNA?
The DNA is in the nucleus.

b- What are the fibres made of?
The fibres are nucleotides joined together.

c- What is a gene?
A gene is a length of DNA that codes for a protein.

What is the DNA?
DNA is deoxyribose neuceic acid.

Second Draft: “The Yellow Wallpaper”, Essay

A couple weeks ago, Cecilia Lasa, our literature teacher told us to write an essay on “The Yellow Wallpaper” without the conclusion. We were to send it to her so she could correct it and then, with the corrections made, we had to type up a conclusion and upload it. I worked with Luz Garcia Fernandez:
“The Yellow Wallpaper” is written upon a paradox: the man and woman’s relationship.

  In the story “The Yellow Wallpaper” by Charlotte Perkins Gilman we can see how the husband and wife are not who they seem to be throughout the story. John is a physician, he shows a lot of concern for his wife, while his wife, who is ‘sick’ is put away from her child and is isolated. In the end we are able to see how the situation is changed and there is a change in their roles as ‘crazy’ people.    

  On the one hand, there is the Husband, a doctor. We see how this character metonymically reflects positivism. He “scoffs openly at any talk of things not to be felt and seen and put down in figures.” Since he is a man of science, there needs to be a concrete reason for everything. He was a man who in that time had the upper hand on decisions, he was the one who provided for the family and was basically ‘the king of the house’. At the start of the story we see how he portrays his wife as the crazy one, keeping her away from her own child, imprisoning her in the house, not letting her work until she is ‘well again’. Such decision is left to his own criteria which disregards his wife’s say in the matter. This situation reproduces the typical Victorian relationship: he is in power, she is submissive. But towards the end the tables turn, the woman takes the power, when he is trying to open the door and she would tell him to go get the key: “The key is down by the front door, under the plantain leaf”. She kept trying for him to just go and do the job for once instead of her having to obey him every single time. After this is one of the most crucial moments in the story, where roles change. The husband opens the door and faints and she doesn’t even recognize him as her husband anymore, he is a stranger for her: “Now why should that man have fainted?” He is not John for her anymore, he is not her husband, he is a complete stranger in her way. This is where the reversal occurs, where husband and wife change roles.

 On the other hand, there is the wife and her role change. She is a stay-at-home mother who was dragged to this huge house three miles from the village to be with herself until she is well again. We have to emphasize on the fact that John is the one who decides when she is better. “[The house] is quite alone standing” is clearly a reflection of her situation since her husband is working all the time and she is always in the room with the yellow wallpaper. The narrator makes us think she is the crazy one throughout the whole story but at the end, comes the change in roles. “”I’ve got out at last,” said I, “in spite of you and Jane.” This is the moment in the story where we have to rethink it all and wonder who the crazy really is. She feels liberated from her controlling husband. “And I’ve pulled off most of the paper, so you can’t put me back!”” John thinks she’s sick, and she thinks John is manipulating her. She doesn’t feel crazy. But, we don’t know what John feels. We would have to hear the story from another point of view to really understand who is the insane character.

To complete our theory, we don’t know if either of them are crazy, but the writer wants to confuse us and leave it to us to decide. Naturally, because John is a man of science you would think the woman is mad. However, we showed to you this other possibility, this other possible theory.